XV

INDEX t o VOL. CXXVI. (A)

Absorption of light by chlorine and bromine (Gray and Style), 603. Adair (G. S.) The Thermodynamic Analysis of the Observed Osmotic Pressures of Protein Salts in Solutions of Finite Concentration, 16. Adam (N. K.) The Structure of Surface Films, XIV, 366 ; XV, 526. Adam (N. K.) and Rosenheim (0.) The Structure of Surface Films, XIII, 25. Adam (N. K.) See also Rosenheim and Adam. Adhesion and the passive state (Nottage), 630. Akker (J. A. v. d.) See Watson and Akker. Allsopp (C. B.) See Lowry and Allsopp. xAlpha-particles, fast, passage through gases (Williams and Terroux), 289. x\lpha-ray tracks, wave mechanics (Mott), 79. Amines, surface films (Adam), 526. Andress (W. R.) Some Solutions of Einstein’s Gravitational Equations for Systems with Axial Symmetry, 592. Anniversary meeting address (Rutherford), 184. Appleton (E. V.) On some Measurements of the Equivalent Height of the Atmospheric Ionised Layer, 542. x\ston (F. W.) The Photometry of Mass-spectra and the Atomic Weights of Krypton, Xenon and Mercury, 511. Atmosphere, height of ionised layer (Appleton), 542. Atmosphere, waves and tides (Taylor), 169, 728. Atomic levels, ejection of photo- (Watson and Akker), 138.

Benzene ring, magnetic and optical properties (Bhagavantam), 143. Bhagavantam (S.) The Magnetic and Optical Properties of the Benzene Ring in Aromatic Compounds, 143. Blackett (P. M. S.), Henry (P. S. H.), and Rideal (E. K.) A Flow Method for comparing the Specific Heats of Gases, 319, 333. Blundell (E.) See Davies and others. Bowden (F. P.) The Kinetics of the Electro-deposition of Hydrogen and Oxygen, 107. Brinkworth (J. H.) On the Temperature Variation of the Specific Heats of Hydrogen and Oxygen, 204. Chapman (S.) A note on the Measurement of Specific Heats of Gases, 675. Chemical changes, rapid, time course of heat effects (Roughton), 439, 470. Colborne (D. C.) See Goldsbrough and Colborne. Colloidal systems, polydisperse (Marshall), 427. Conduction of electricity in metals (Stern), 570. Continuous absorption (Gaunt), 654. Daniell (P. J.) The Theory of Flame Motion, 393. Davies (A. C.), Horton (F.), and Blundell (E.) Critical Potentials for the Excitation of Soft X-rays from Iron, 661. VOL. CXXVI.— A. C XVI

Dielectric behaviour and refractivity of liquids (Krishnan), 155. Dielectric constants of organic liquids, variation (Lunt and Govinda Rau), 213. Dirac (P. A. M.) A Theory of Electrons and Protons, 360. Dissociation of acids in alcohol (Murray-Rust and Hartley), 84.

Eddington (A. S.) The Interaction of Electric Charges, 696. Einstein’s gravitational equations (Andress), 592. Electric charges, interaction (Eddington), 696. Electro-deposition of hydrogen and oxygen (Bowden), 107. , range of frequencies (Flint), 40. Electrons and protons, theory (Dirac), 360. Electrons, collision (Mott), 259. Electrophoresis of protein salts (Prideaux and Howitt), 126.

Fatty acid esters, surface films (Adam), 366. Films of ergosterol (Rosenheim and Adam), 34. Films of sterols (Adam and Rosenheim), 25. Fisher (J. W.) and Flint (H. T.) The Equations of the Quantum Theory, 644. Flame motion, theory (Daniell), 393. Flint (H. T.) On the Determination of the Range of Frequencies within the Group of Mechanical Waves of an Electron, 40. Flint (H. T.) See also Fisher and Flint. Flow through pipe orifices (Johansen), 231. Gamow (G.) Mass Defect Curve and Nuclear Constitution, 632. Gaseous mixtures, pressure, III (Tanner and Masson), 268. Gaunt (J. A.) Continuous absorption, 654. Gelatin, setting of, and theory of gel formation (Pleass), 406. Glaisher (J. W. L.), obituary notice, i. Gold crystals and supra-conductivity (Kapitza), 683. Goldsbrough (G. R.) and Colborne (D. C.) The Tides in Oceans on a Rotating Globe, III, 1. Govinda Rau (M. A.) See Lunt and Govinda Rau. Gray (L. T. M.) and Style (D. W. G.) The Absorption of Light by Chlorine, Bromine and their Gaseous Mixtures, 603. Green flash, caused by dispersion (Rayleigh), 311.

Hartley (Sir Harold) See Murray-Rust and Hartley. Harvey (A.) The Zeeman Effect in the Band Spectrum of Helium, 583. Henry (P. S. H.) See Blackett and others. Horton (F.) See Davies and others. Howitt (F. O.) See Prideaux and Howitt. Jackson (C. V.) The Spectrum of Silicon Hydride, 373. Johansen (F. C.) Flow through Pipe Orifices at Low Reynolds Numbers, 231. Jones (H. S.) The Light of the Night Sky, 246.

Kapitza (P.) The Change of Resistance of Gold Crystals at very Low Temperatures in a Magnetic Field and Supra-conductivity, 683. Krishnan (K. S.) The Influence of Molecular Form and Anisotropy on the Refractivity and Dielectric Behaviour of Liquids, 155. Krypton, atomic weight (Aston), 511. XVII

Liversidge (A.), obituary notice, xii. Lowry (T. M.) and Allsopp (C. B.) A Photographic Method of Measuring Refractive Indices, 165. Lunt (R. W.) and Govinda Rau (M. A.) The Variation of the Dielectric Constants of some Organic Liquids, 213.

Marshall (C. E.) A New Method of Determining the Distribution Curve of Polydisperse Colloidal Systems, 427. Mass-spectra and atomic weights of krypton, xenon and mercury (Aston), 511. Masson (I.) See Tanner and Masson. Mercmy, atomic weight (Aston), 511. Molecular structure, infra-red investigations, IV (Snow and Rideal), 355. Mosharrafa (A. M.) Wave Mechanics and the Dual Aspect of Matter and Radiation, 35. Mott (N. F.) The Wave Mechanics of Alpha-Ray Tracks, 79. The Collision between Two Electrons, 259. Murray-Rust (D. M.) and Hartley (Sir Harold). The Dissociation of Acids in Methyl and in Ethyl Alcohol, 84.

Night sky, light (Jones), 246. Nitric oxide overtone (Snow and Rideal), 355. , Nottage (M.) The Passive State and Adhesion, 630. Nuclear constitution and mass defect curve (Gamow), 632.

Obituary notices : Glaisher (J. W . L.), i ; Liversidge (A.), xii. Osmotic pressures of protein salts (Adair), 16.

Perman (E. P.) and Urry (W. D.) The Compressibility of Aqueous Solutions, 44. Photo-electrons, directions of ejection (Watson and Akker), 138. Pleass (W. B.) Some Physical Conditions affecting the Setting of Gelatin, 406. Prideaux (E. B. R.) and Howitt (F. O.) The Electrophoresis of Protein Salts in the presence of Gold Sols—Albumen, Gelatin and Casein, 126.

Quantum theory, equations (Fisher and Flint), 644.

Rayleigh (Lord) Normal Atmospheric Dispersion as the cause of the Green Flash at Sunset, 311. Refractive indices, photographic measurement (Lowry and Allsopp), 165. Refractivity and dielectric behaviour of liquids (Krishnan), 155. Richardson (0. W. R.) A New Connection between the Absorption Spectrum of Hydrogen and the Many-lined Spectrum, 487. Rideal (E. K.) See Blackett and others and Snow and Rideal. Rosenheim (O.) See also Adam and Rosenheim. Rosenheim (O.) and Adam (N. K.) Monomolecular Films of Irradiated Ergosterol in Relation to the Production of Vitamin D, 34. Roughton (F. J. W.) The Time Course of the Heat Effects in Rapid Chemical Changes, 439, 470. Rutherford (Sir Ernest) Address at Anniversary Meeting, 184.

Silicon hydride, spectrum (Jackson), 373. Snow (C. P.) and Rideal (E. K.) Infra-red Investigations of Molecular Structure, IV, 355. Solutions, aqueous, compressibility (Perman and Urry), 44. XV111

Specific heats of gases (Chapman), 675. Specific heats of gases, compared by a flow method (Blackett and others), 319, 333. Specific heats of hydrogen and oxygen (Brinkworth), 204. Spectrum, continuous absorption (Gaunt), 654. Spectrum, helium, Zeeman effect (Harvey), 583. Spectrum, hydrogen, absorption and many-lined (Richardson), 487. Spectrum, infra-red, nitric oxide (Snow and Rideal), 355. Spectrum, silicon hydride (Jackson), 373. Stern (T. E.) Some Remarks on the Conduction of Electricity in Metals and upon Allied Phenomena, 570. Sterols, surface films (Adam and Rosenheim), 25. Style (D. W. G.) See Gray and Style. Supra-conductivity and gold crystals (Kapitza), 683.

Tanner (C. C.) and Masson (I.) The Pressures of Gaseous Mixtures, III, 268. Taylor (G. I.) Waves and Tides in the Atmosphere, 169, 728. Terroux (F. R.) See Williams and Terroux. Tides in oceans (Goldsbrough and Colborne), 1. Tides in the atmosphere (Taylor), 169, 728. Tungsten crystals, elasticity (Wright), 613.

Urry (W. D.) See Perman and Urry.

Watson (E. C.) and Akker (J. A. v. d.) Differences in the Directions of Ejection of X-Ray Photo-electrons from various Atomic Levels, 138. Wave Mechanics (Mosharrafa), 35. Wave mechanics of alpha-ray tracks (Mott), 79. Waves and tides in the atmosphere (Taylor), 169, 728. Williams (E. J.) and Terroux (F. R.) Investigation of the Passage of Fast a-Particles through Gases, 289. Wright (S. J.) The Elasticity of Pintsch Crystals of Tungsten, 613.

Xenon, atomic weight (Aston), 511. X-rays, soft, from iron, critical potentials (Davies and others), 661.

Zeeman effect in helium spectrum (Harvey), 583.

END OF THE ONE HUNDRED AND TWENTY-SIXTH VOLUME (SERIES A). MINUTES OF MEETINGS OF THE ROYAL SOCIETY.

November 7, 1929.

Sir , O.M., President, in the Chair. Mr. J. Gray was admitted into the Society.

The following Papers were read :—

I. W. A. Lamborn. “ The Remarkable Adaptation by which a Dipterous Pupa (Tabanidae) is preserved from the Danger of Fissures in Drying Mud.” Communicated by E. B. Poulton, F.R.S.

II. H. E. R oaf. “ The Absorption of Light by the Coloured Globules in the Retina of the Domestic Hen.” Com­ municated by Sir Charles Sherrington, F.R.S.

III. R. G. Tomkins. “ Studies of the Growth of Moulds.—1.” Communicated by Sir William Hardy, F.R.S.

IY. R. H. Stoughton. “ The Morphology and Cytology of Bacterium malvacearum E.F.S.” Communicated by Sir John Russell, F.R.S. V. E. C. Smith. “ On the Coagulation of Muscle Plasma. Communicated by Sir William Hardy, F.R.S.

VI. S. L. Hora.' “ Ecology, Bionomics and Evolution of the Torrential Fauna, with special reference to the Organs of Attachment.” Communicated by J. H. Ashworth, F.R.S. VII. N. J. Berrill. “ Studies in Tunicate Development.— Part I.” Communicated by D. M. S. Watson, F.R.S.

VIII. J. C. Kernot, J. Knaggs and M. Kaye. ' The Swelling of Fish Skins in Solutions of Inorganic and Organic Acids.” Communicated by Sir William Hardy, F.R.S. IX. A. Y. Hill, F.R.S. “ Anaerobic Survival in Muscle. ’ X. A. V. Hill, F.R.S., and P. Kupalov. “ Anaerobic and Aerobic Activity in Isolated Muscle.”

XI. S. Cooper and D. D e n n y-B rown. I he Interaction between two Trains of Impulses converging on the Same Motoneurone.” Communicated by Sir Charles Sherring ton, F.R.S. [ ii ]

*XII. C. H. Best and R. Partridge. “ Observations on Olympic Athletes.” Communicated by A. V. Hill, F.R.S.

XIII. H. S. H olden. “ On tbe Structure and Affinities of Ankyropteris corrugata.” Communicated by I). H. Scott, F.R.S.

XIV. W. R. I. Cook and E. J. Schwartz. “ Life-bistory, Cytology and Method of Infection of brassicae Woron, the Cause of Finger-and-Toe Disease of Cabbages and other Crucifers.” Communicated by E. J. B utler, F.R.S.

XV. R. Broom, F.R.S. “ On the Structure of the Mammal-like Reptiles of the Suborder Gorgonopsia.”

XVI. H. K. Mookerjee. “ On the Development of the Vertebral Column of Anura.” Communicated by E. W. MacBride, F. R.S.

XVII. H. K. Mookerjee. “ On the Development of the Vertebral Column of Urodela.” Communicated by E. W. MacBride, F.R.S.

XVIII. R. R. Gates and F. M. L. Sheffield. “ Megaspore Development in Oenothera Communicated by Sir John F armer, F.R.S.

XIX. C. F. A. Pantin. “ On the Physiology of Amoeboid Move­ ment.—I, II and III.” Communicated by E. J. Allen, F.R.S.

XX. 0. Rosenheim, F.R.S., and N. K. Adam. “ Monomolecular Films of Irradiated Ergosterol in Relation to the Produc­ tion of Vitamin D.”

XXI. R. N. Mukerji. “ Effect of X-Radiation on the Spermato­ genesis of Lepisma domestica.” Communicated by J. P. Hill, F.R.S.

XXII. J. B. Gatenby, R. N. Mukerji and Sylvia Wigoder. “ The Effect of X-Radiation on the Spermatogenesis of Abraxas grossulariata.” Communicated by J. P. Hill, F.R.S.

XXIII. B. Dawes. “ The Development of the Vertebral Column in Mammals, as illustrated by its Development in M m musculus.” Communicated by E. W. MacBride, F.R.S. [ iii ]

November 14, 1929. Sir Ernest RUTHERFORD, O.M., President, in the Chair. The Annual Report of Council was received. The following Papers were read :— I. V. Henri and 0. R. Howell. “ The Structure and Activa­ tion of the Molecule of Phosgene. An Analysis of the Ultra-Violet Absorption Spectrum of Phosgene Vapour.” Communicated by T. M. Lowry, F.R.S.

II. T. M. Lowry, F.R.S., and C. B. Allsopp. “ A Photo­ graphic Method of Measuring Refractive Indices.”

III. C. P. Snow and E. K. Rideal. “ Infra-Red Investigations of Molecular Structure. Ill and IV.” Communicated by T. M. Lowry, F.R.S. IV. P. M. S. Blackett, P. S. H. Henry and E. K. Rideal. “ A Flow Method for comparing the Specific Heats of Gases.” Communicated by Sir Ernest Rutherford, P.R.S. V. J. H. Brinkworth. “ On the Temperature Variation of the Specific Heats of Hydrogen and Nitrogen.” Com­ municated by H. L. Callendar, F.R.S.

VI. R. W. Lunt and M. A. Govinda Rau. “ The Variation of the Dielectric Constants of some Organic Liquids with Frequency in the Range 1 to 10 Kilocycles.” Com­ municated by F. G. Donnan, F.R.S. VII. J. A. Hall. “ The International Temperature Scale between 0° and 100° C.” Communicated by Sir Joseph Petavel, F.R.S. VIII. D. M. Murray-Rust and Sir Harold Hartley, F.R.S. “ The Dissociation of Acids in Methyl and Ethyl Alcohol.”

IX. K. S. Krishnan. “ The Influence of Molecular Form and Anisotropy on the Refractivity and Dielectric Behaviour of Liquids.” Communicated by Sir Venkata Raman, F.R.S. X. H. Bateman, F.R.S. “ The Two-Dimensional Motion of a Compressible Fluid.” XL Sir Almroth Wright, F.R.S. “ Further Studies on Intertraction.” XII L. J. Mordell, F.R.S. “ Kronecker’s Fundamental Limit Formula in the Theory of Numbers and Elliptic Functions, and Similar Theorems.” [ iv ]

XIII. E. J. Williams. “ The Straggling of (3-Particles.” Com­ municated by Sir Ernest Rutherford, P.R.S.

XIV. W. H. Watson. “ The Effect of a Transverse Field on the Propagation of Light in vacuo.” Communicated by Sir Ernest Rutherford, P.R.S.

XV. J. W. McBain, F.R.S., and C. R. Peaker. “ The Electrical Conductivity caused by Insoluble Monomolecular Films of Fatty Acid on Water.” XVI. F. P. Bowden. “ The Amount of Hydrogen and Oxygen present on the Surface of a Metallic Electrode.” Com­ municated by T. M. Lowry, F.R.S. XVII. F. H. Schofield. “ The Melting Point of Palladium.” Communicated by Sir Joseph Petavel, F.R.S.

XVIII. G. P. Thomson. “ of Cathode Rays.— III.” Communicated by Sir Joseph Thomson, F.R.S.

XIX. K. R. Rao. “ Regularities in the Arc Spectrum of Arsenic.” Communicated by A. F owler, F.R.S.

XX. H. W. Thompson and C. N. Hinshelwood, F.R.S. “ The Kinetics of the Oxidation of Ethylene.”

XXI. J. A. V. Butler and C. M. R obertson. “ The Behaviour of Electrolytes in Mixed Solvents.—Part I.” Com­ municated by J. Kendall, F.R.S.

XXII. F. W. P. Gotz and G. M. B. D obson, F.R.S. “ Observa­ tions on the Height of Ozone.—II.”

XXIII. R. W. James, G. W. Brindley and R. G. Wood. “ A Quantitative Study of the Reflexion of X-Rays from Crystals of Aluminium.” Communicated by W. L. Bragg, F.R.S.

XXIV. U. R. Evans and L. C. Bannister. “ The Growth of Silver Iodide Films.” Communicated by Sir Henry Carpenter, F.R.S.

XXV. W. E. Curtis and A. H arvey. “ Structure of the Band Spectrum of Helium.—VI.” Communicated by T. H. Havelock, F.R.S.

XXVI. J. W. MCBain, F.R.S., and H. G. Tanner. “ A Robust Microbalance of High Sensitivity, suitable for Weighing Sorbed Films.”

XXVII. G. I. Finch and D. L. Hodge. “ Gaseous Combustion in Electric Discharges.—IV.” Communicated by W. A. Bone, F.R.S. [ V ]

XXVIII. A. Muller. “ A Spinning-Target X-Ray Generator and its Input Limit.” Communicated by Sir William Bragg, F.R.S.

XXIX. R. H. Dalton and C. N. Hinshelwood, F.R.S. “ The Oxidation of Phosphine at Low Pressures.”

XXX. 0. W. Richardson, F.R.S., and K. Das. “ The Spectrum of H 2: The Bands Analogous to the Ortho-helium Spectrum.—II.”

XXXI. F. P. Bowden. “ The Kinetics of the Electric Deposition of Hydrogen and Oxygen.” Communicated by T. M. Lowry, F.R.S. XXXII. J. Hume and L. Colvin. “ The Decomposition of Potas­ sium Hydrogen Oxalate Hemihydrate.” Communicated by R. Whytlaw-Gray, F.R.S.

XXXIII. C. J. Smith. “ A New Form of Calorimeter, Suitable for Determining Heats of Solution, with an Application to Worked and Annealed Metals. With Appendix, by C. H. Desch, F.R.S.” Communicated by C. H. Descii, F.R.S. XXXIV. L. M. Swain. “ On the Turbulent Wave behind a Body of Revolution.” Communicated by L. Prandtl, For.Mem.R.S. XXXV. W. H. Barnes. “ The Crystal Structure of Ice between 0° C. and — 183° C.” Communicated by Sir William Bragg, F.R.S.

XXXVI. J. C. McLennan, F.R.S., A. B. McLay and M. F. Craw­ ford. “ The Spark Spectrum of Thallium, T1II—Term Analysis ; Fine Structure of Lines.”

November 21, 1929. Sir Ernest RUTHERFORD, O.M., President, in the Chair.

Prof. J. P. Hill, F.R.S., delivered the Croonian Lecture on Ihe Developmental History of the Primates. t vi ]

November 30, 1929.

Anniversary Meeting. Sir Ernest RUTHERFORD, O.M., President, in the Chair. The report of the Auditors ot the Treasurer’s accounts was read and the thanks of the Society were given to the Treasurer and to the Auditors. The Lists of Fellows deceased and of Fellows elected into the Society since the last Anniversary were read. The Report to the Society from the Council upon the work during the past year was, upon the motion of the President, received. The President delivered his Anniversary Address. On the motion of Sir Oliver Lodge, seconded by Sir Richard Glazebrook, the thanks of the Society were returned to the President for his Address. The Awards of the Medals for the year were announced as follows, and the Medals were presented from the Chair :— The Copley Medal...... to Prof. M. Planck. A ...... ,, Prof. J. E. Littlewood. A Royal Medal ...... ,, Prof. R. Muir. The Davy Medal ...... ,, Prof. G. N. Lewis. The Hughes Medal ...... ,, Prof. H. Geiger. The President having, with the consent of the Society, nominated Sir Gerald Lenox-Conyngham and Prof. E. B. Poulton as Scrutators to examine the balloting lists for the election of Council and Officers, the votes of the Fellows present were taken. The Scrutators reported that the Council and Officers whose names had been read at the pre­ ceding meeting had been duly elected as under :— President.—Sir Ernest Rutherford, O.M,, M.A., D.Sc. Treasurer.—Sir Henry George Lyons, D.Sc. o , • /D r. Henry Hallett Dale, C.B.E., M.A. \D r. Frank Edward Smith, C.B., C.B.E. Foreign Secretary.—-The Lord Rayleigh, M.A., Sc.D. Other Members of the Council.—Dr. Edgar Johnson Allen ; Dr. Charles Bolton, C.B.E. ; Prof. Arthur Edwin Boycott, M.A., D.M., LL.D. ; Prof. Charles Galton Darwin, M.A. ; Dr. Claude Gordon Douglas, C.M.G. ; Sir Janies Alfred Ewing, K.C.B., M.A., D.Sc. ; Prof. Ernest William Hobson, Sc.D., LL.D. ; Sir Frederick Gowland Hopkins, M.A., D.Sc. ; Dr. William Hobson Mills, M.A. ; Prof. Edward Arthur Milne, M.B.E., M.A. ; Sir Peter Chalmers Mitchell, C.B.E., M.A. ; Prof. James Charles Philip, O.B.E., D.Sc. ; Dr. Alfred Barton Rendle, M.A. ; Mr. Alan Archibald Campbell Swinton ; Prof. William Whitehead Watts, Sc.D., LL.D.; Prof. Charles Thomas Rees Wilson, M.A., LL.D. [ vii ]

December 5, 1929.

Sir Ernest RUTHERFORD, O.M., President, in the Chair.

The President announced that he had appointed the following to be Vice-Presidents for the ensuing year:— Sir Alfred Ewing. Sir Frederick Hopkins. Sir Henry Lyons.

The following papers were read :— I. F. L. Arnot. “ Electron Scattering in Mercury Vapour.” Communicated by J. Chadwick, F.R.S.

II. F. A. B. Ward, C. E. Wynn-Williams and H. M. Cave. “ The Rate of Emission of Alpha-Particles from Radium.” Communicated by J. Chadwick,. F.R.S.

HI. E. J. Williams and F. R. Terroux. “ Investigation of the Passage of Fast Beta-Particles through Gases.” Communi­ cated by Sir Ernest Rutherford, P.R.S.

IV. R. J. C. Howland. “ On the Stresses in the Neighbourhood of a Circular Hole in a Strip under Tension.” Communi­ cated by L. N. G. Filon, F.R.S.

V. E. P. Perman and W. D. Urry. “ The Compressibility of Aqueous Solutions.” Communicated by A. W. Porter, F.R.S. VI. G. S. Adair. “ The Thermodynamic Analysis of the Observed Osmotic Pressures of Protein Salts in Solutions of Finite Concentration.” Communicated by- Sir William Hardy, F.R.S. VII. E. B. R. Prideaux and F. 0. Howitt. “ The Electrophoresis of Protein Sols in the Presence of Gold Sols—Albumen, Gelatin and Casein.” Communicated by F. S. K ipping, F.R.S.

VIII. S. B hagavantam. “ The Magnetic and Optical Properties of the Benzene Ring in Aromatic Compounds.” Communicated by Sir C. V. R aman, F.R.S. IX E. C. Watson and J. A. tan ben Akker. “ Differences in the Directions of Ejection of X-ray Photo-Electrons from Various Atomic Levels.” Communicated by H. Bateman, F.R.S.

X. G. R. Goldsbrough, F.R.S., and D. C. Colborne. “ The Tides in Oceans on a Rotating Globe.”—HI. [ viii ]

XI. A. M. Mosharrafa. “ Wave Mechanics and the Dual Aspect of Matter and Radiation.” Communicated by 0. W. Richardson, F.R.S.

XII. H. T. Flint. “ On the Determination of the Range of Frequencies within the Group of Mechanical Waves of an Electron.” Communicated by 0. W. R ichardson, F.R.S.

XIII. H. Spencer-Jones. “ The Light of the Night Sky : Analysis of Intensity Variations observed at the Cape, at Canberra and in England.” Communicated by Lord R ayleigh, F.R.S.

January 16, 1930.

Sir Ernest RUTHERFORD, O.M., President, in the Chair.

In pursuance of the Statutes, the names of Candidates proposed for election into the Society were read, as follows :— Adam, Niel Kensington. Crowther, James Arnold. Allen, Herbert Stanley. Dawson, Harry Medforth. Andrews, Ernest Clayton. Dean, Henry Roy. Bailey, Edward Battersby. Denny, Sir Archibald. Barrington, Frederick Janies Dewey, Henry. Fitzmaurice. Dhar, Nilratan. Beaven, Edwin Sloper. Dirac, Paul Adrien Maurice. Bengough, Guy Dunston. Doodson, Arthur Thomas. Berwick, William Edward Douglas, Rear-Admiral Henry Hodgson. Percy. Bidder, George Parker. Drummond, Jack Cecil. Blacklock, Donald Breadalbane. Drysdale, Charles Vickery. Bolton, Joseph Shaw. Dudley, Harold Ward. Boswell, Percy George Hamnall. Dunn, John Shaw. Brady, Oscar Lisle. Eckersley, Thomas Lydwell. Brooks, Frederick Tom. Edgeworth, Francis Henry. Budge, Sir Ernest Alfred Edwards, Charles Alfred. Thompson Wallis. Eltringham, Harry. Burt, Cyril Ludowic. Evershed, Sydney. Campbell, James Argyll. Fearnsides, William George. Carter, Frederick William. Ferguson, Allan. Castellani, Sir Aldo. Fleming, Alexander. Chapman, Frederick. Flower, Major Stanley Smyth. Clark, Alfred Joseph. Francis, Francis Ernest. Collip, James Bertram. Gardner, John Addyman. Crew, Francis Albert Eley. Garner, William Edward. £ ix ]

Garstang, Walter. Partington, James Riddick. Gaskell, John Foster. Patterson, Thomas Stewart. Gatenby, James Bronte. Percival, John. Gibb, Sir Alexander. Pidduck, Frederick Bernard. Gibson, Charles Stanley. Rankine, Alexander Oliver. Gill, Ernest Walter Brudenell. Read, John Glauert, Hermann. Rideal, Eric Keightley. Gough, Herbert John. Robertson, Thorburn Brailsford. Gray, James Gordon. Robison, Robert. Hammond, John Row, Lieut.-Colonel Raghavendra. Harington, Charles Robert. Salaman, Redcliffe Nathan. Heilbron, Isidor Morris. Salisbury, Edward James. Henry, Augustine. Sewell, Robert Beresford Seymour. Hill, Thomas George. Slade, Roland Edgar. Hindle, Edward. Smith, Bernard Hinton, Martin Alister Campbell. Smith, Thomas. Howe, George William Osborn. Spencer, William Kingdon. Huxley, Julian Sorell. Stephenson, John. Inglis, Charles Edward. Stewart, Alfred Walter. James, Sydney Price. Taylor, Hugh Stott. Jehu, Thomas John. Thomson, George Paget. Jenkin, Charles Frewen. Titchmarsh, Edward Charles. Jones, Harold Spencer. Todd, Charles. Kemp, Stanley Wells. Topley, William Whiteman Kenyon, Joseph. Carlton. King, Harold. Trechmann, Charles Taylor. Laby, Thomas Howell.' Trotter, Wilfred. Lambert, Bertram. Turnbull, Herbert Westren. Levy, Hyman. Usher, Charles Howard. Masson, Irvine. Watson, Sir Malcolm. Miller, William Lash. Wedderburn, Joseph Henry Moir, James Reid. Maclagan. Newman, Frederick Henry. Wheeler, Richard Vernon. Orr, John Boyd. Wilson, Ernest. Orton, James Henry. Wilson, Forsyth James. Palmer, Frederick. Wimperis, Harry Egerton. Parks, William Arthur. Yorke, Warrington. Parsons, Frederick Gymer. The following papers were read :— J. K. Marrack and F. C. Smith. “ The Composition of I. Diphtheria Toxin—Antitoxin Floccules. Communi- cated by Sir Charles Martin, F.R.S. II. F. G. Spear. “ The Delayed Lethal Effect of Radium on Tissue Cultures in vitro.” Communicated by ir Frederick Andrewes, F.R.S. [ X ]

III. .T. T. Cunningham. “The Vascular Filaments on the Pelvic Limbs of Lepidosiren, their Function and Evolu­ tionary Significance.” Communicated by Prof. E. W. MacBride, F.R.S.

IV. Sir Frederick Keeble, F.R.S., M. G. Nelson, and R. Snow. “ The Integration of Plant Behaviour. I : Separate Geotropic Stimulations of Tip and Stump in Roots.”

V. Charles Todd, “ Cellular Individuality in the Higher Animals, with special reference to the Individuality of the Red Blood Corpuscle.” Communicated by S. R. D ouglas, F.R.S.

VI. J. Ewles and J. B. Speakman. “ Examination of the Fine Structure of Wool by X-Ray Analysis.” Communicated by Prof. R. Whiddington, F.R.S.

January 23, 1930. Sir Ernest RUTHERFORD, O.M., President, followed by Lord RAYLEIGH, in the Chair.

The following papers were read :—

I. Lord Rayleigh, F.R.S. “ Normal Atmospheric Disper­ sion as the Cause of the ‘ Green Flash ’ at Sunset, with Illustrative Experiments.”

II. F. W. Aston, F.R.S. “ The Photometry of Mass-Spectra and the Atomic Weights of Krypton, Xenon and Mer­ cury.”

III. 0. W. Richardson, F.R.S. “ A New Connection between the Absorption Spectrum of Hydrogen and the Many- - lined Spectrum.”

IV. P. A. M. Dirac. “ A Theory of Electrons and Protons.” Communicated by R. H. Fowler, F.R.S.

V. R. V. Southwell, F.R.S., and L. Chitty. “ On the Problem of Hydro-dynamic Stability. I.”

VT. N. K. Adam and O. Rosenheim, F.R.S. “ The Structure of Surface Films. Part X III.”

VII. E. V. Appleton, F.R.S. “ Some Measurements of Equi­ valent Height of the Atmospheric Ionized Layer.” [ xi ]

VIII. T. E. Stern. “ Some Remarks on the Conduction of Electricity in Metals and upon Allied Phenomena. ” Com­ municated by R. H. F owler, F.R.S.

IX. A. Harvey. “ The Zeeman Effect in the Band Spectrum of Helium. II.” Communicated by T. H. Havelock, F.R.S.

X. P. J. D aniell. “ The Theory of Flame Motion.” Com­ municated by S. R. Milner, F.R.S.

XI. F. C. Johansen. “ Flow through Pipe Orifices at Low Reynolds Numbers.” Communicated by R. V. South- well, F.R.S.

XII. W. B. P leass. “ Some Physical Conditions affecting the Setting of Gelatin and the Bearing of the Results on the Theory of Gel Formation.” Communicated by R. H. P ickard, F.R.S.

XIII. N. F. Mott. “ The Collision between Two .” Com­ municated by R. H. F owler, F.R.S.

XIV. C. C. Tanner and I. Masson. “ The Pressure of Gaseous Mixtures. III.” Communicated by F. G. D onnan, F.R.S.

XV. F. J. W. R oughton. “ The Time Course of the Heat Effects in Rapid Chemical Changes. Parts I and II. ’ Com­ municated by H. H artridge, F.R.S.

XVI. E. T. Hanson. “ Diffraction.” Communicated by h. E. Smith, Sec.R.S.

XVII C E Marshall. “ A New Method of Determining the Distribution Curve of Polydisperse Colloidal Systems. Parts I and II.” Communicated by R. Whytlaw- Gray, F.R.S. XVIII. N. K. Adam. “ Structure of Surface Films. Part XIV. Communicated by F. G. Donnan, F.R.S.

XIX. N. F. Mott. “ The Wave Mechanics of a-Ray Tracks.” Communicated by C. G. Darwin, F.R.S.

January 30, 1930. Sir Ernest RUTHERFORD, O.M., President, in the Chair.

3 following papers were read :— R N. Salaman. “ Crinkle ‘ A ,’ an Infectious Disease of the P otato.” Communicated by H. H. Dale, Sec. R.S. [ XU ]

II. R. N. Salaman and R. H. Le Pelley. Para-crinkle, a Potato Disease of the Virus Group.” Communicated by H. H. Dale, Sec. R.S.

III. E. C. Smith and T. Moran. “ The Formation of Lactic Acid in Desiccated Amphibian Muscles.” Communicated by Sir William Hardy, F.R.S.

IV. H. G. Thornton. “ The Influence of the Host Plant in Inducing Parasitism in Lucerne and Clover Nodules.” Communicated by Sir John R ussell, F.R.S.

V. F. Kidd and C. West. “ Physiology of Fruit. I.—Changes in the Respiratory Activity of Apples during their Senescence at Different Temperatures.” Communicated by F. F. Blackman, F.R.S.

VI. R. N. Mukerji. “ The ‘ Nucleal Reaction ’ in Apanteles sp., with special reference to the Secondary Nuclei and the Germ Cell Determinant of the Egg.” Communicated by J. P. Hill, F.R.S.

February 6, 1930.

Sir Ernest RUTHERFORD, O.M., President, in the Chair.

The following papers were read :—

I. H. J. Gough and H. L. Cox. “ The Behaviour of a Single Crystal of Antimony subjected to Alternating Torsional Stresses.” Communicated by Sir Thomas Stanton, F.R.S.

II. H. J. Gough and H. L. Cox. “ Further Experiments on the Behaviour of Single Crystals of Zinc subjected to Alternating Torsional Stresses.” Communicated by Sir Thomas Stanton, F.R.S.

III. G. D. Bengough, J. M. Stuart and A. R. Lee. “ The Theory of Metallic Corrosion in the Light of Quantitative Measurements. III.” Communicated by Sir Harold Carpenter, F.R.S.

IV. A. H. Davis and E. J. Evans. “ Measurement of Absorbing Power of Materials by the Stationary Wave Method.” Communicated by Sir Joseph Petavel, F.R.S.

V. J. W. Fisher and H. T. F lint. “ The Equations of the Quantum Theory.” Communicated by 0. W. Richardson, F.R.S. VI. J. Hargreaves. “ The Effect of Nuclear Spin on the Optical Spectra. II.” Communicated by R. H. F owler, F.R.S..

VII. E. Rudberg. “ Characteristic Energy Losses of Electrons Scattered from Incandescent Solids.” Communicated by 0. W. Richardson, F.R.S.

VIII. J. A. Gaunt. “ Continuous Absorption.” Communicated by R. H. F owler, F.R.S. IX. S. K. Banerji. “ Microseisms Associated with Disturbed Weather in Indian Seas.” Communicated by Sir Gilbert Walker, F.R.S. X. C. V. Jackson. “ The Spectrum of Silicon Hydride.” Communicated by A. F owler, F.R.S.

XI. E. G. Cox and W. F. B. Shaw. “ Correction Factors in Photographic Measurement of X-Ray Intensities in Crystal Analysis.” Communicated by Sir William Bragg, F.R.S.

XII. W. R. Andress. “ Some Solutions of Einstein’s Gravita­ tional Equations for Systems with Axial Symmetry. Communicated by A. S. Eddington, F.R.S.

XIII. S. Chandra D eb. “ On the Spectrum of Bromine in Different Stages of Ionisation.” Communicated by M. Saha, F.R.S.

XIV. G. Gamow. “ Mass-defect Curve and Nuclear Constitution.’ Communicated by Sir Ernest Rutherford, P.R.S.

February 13, 1930.

Sir Ernest RUTHERFORD, O.M., President, in the Chair.

The following papers were read : I. G. Slater. “ Studies on the Rhone Glacier, 1927. The Structure of the Ice in a Compressed Zone on the South-Eastern Part of the Glacier.” Communicated by W. W. Watts, F.R.S. II. T. Goodey. “ On a Remarkable New Nematode, Tylen- chinema oscinellae gen. et sp. n., parasitic in the Frit fly> Oscindla fritL., attacking Oats.” Communicated by Prof. R. T. Leiper, F.R.S. III. D. E. Sladden. “ Distortion of Development in Amphibia, caused by Lack of Oxygen in very Early Stages in Develop­ ment.” Communicated by G. W. MacBride, F. R.S. [ xiv J

IV. Sir Frederick Keeble, F.R.S., M. G. N elson and R. Snow. “ The Integration of Plant Behaviour. Part II. The Influence of the Shoot on the Growth of Roots in Seedlings.”

V. A. W. Greenwood and J. S. S. Blyth. “ The Results of Testicular Transplantation in Brown Leghorn Hens.” Communicated by F. H. A. Marshall, F.R.S.

VI. J. Beattie, G. R. Brow and C. N. H. Long. “ The Hypoth­ alamus and the Sympathetic Nervous System.” Com­ municated by J. P. Hill, F.R.S.

VII. F. W. Preston. “ Ball-and-Socket Jointing on Basalt Prisms.” Communicated by M. W. Travers, F.R.S.

VIII. B. Sahni. “ AsterochIamopsis, a New Genus of Zygopterid Tree-Ferns from Western Siberia.” Communicated by A. C. Seward, F.R.S.

IX. W. Moppett. “ Observations on the Movement of Cells in vitro.” Communicated by J. T. Wilson, F.R.S.

February 20, 1930.

Sir Ernest RUTHERFORD, O.M., President, in the Chair.

The names of candidates recommended for election into the Society were read from the Chair, as follows:— Prof. Herbert Stanley Allen. Dr, Harold Spencer Jones. Edward Battersby Bailey, Esq. Dr. Eric Keightley Rideal. Frederick Tom Brooks, Esq. Dr. Robert Robison. Dr. Paul Adrien Maurice Dirac. Dr. John Stephenson. Dr. Harold Ward Dudley. Prof. George Paget Thomson. Prof. Charles Alfred Edwards. Dr. Charles Todd. Dr. Harry Eltringham. Prof. William Whiteman Carlton Prof. Charles Edward Inglis. Topley.

The following papers were read :—

I. A. V. H ill, F.R.S. “ A Thermal Method of Measuring the Vapour Pressure of an Aqueous Solution.”

II. A. C. D avies, F. H orton, F.R.S., and E. Blundell. “ Critical Potentials for the Excitation of Soft X-Rays from Iron.” [ XV ]

XXI. A. S. Eddington, F.R.S. “ The Interaction of Electric Charges.”

IV. L. M. T. Gray and D. W. G. Style. “ The Absorption of Light bv Chlorine, Bromine and their Gaseous Mixtures. Communicated by A. J. Allmand, F.R.S.

V. Earl of Berkeley, F.R.S., and E. Stenhouse. ‘‘ The Vapour Density of Water and some Organic Liquids.”

VI. C. E. E ddy and T. H. Laby. “ Quantitative Analysis by X-Ray Spectroscopy.” Communicated by Sir Ernest Rutherford, P.R.S.

VII. G. I. Harper and E. Salaman. “ Measurements of the Ranges of a-Particles.” Communicated by Sir Ernest Rutherford, P.R.S.

VIII. J. J- Nolan and T. E. Nevin. “ The Effect of Water Vapour on the Diffusion Coefficients and Mobilities of Ions in Air.” Communicated by A. W. Conway, F.R.S.

IX. M. Nottage. “ The Passive State of Adhesion.” Com­ municated by Sir William Hardy, F.R.S.