V ll

INDEX to VOL. CXXIV. (A)

Adsorbed gas and emission of soft X-rays (Nakaya), 61G. Adsorption of electrolytes, influence of (Phelps and Peters), 554. Alpha particles, radioactive decay and nuclear penetration (Fowler and Wilson), 493. Analysis by X-ray spectroscopy (Eddy and others), 249. Asundi (R. K.) The Third Positive Carbon and Associated Bands, 277. Asundi (R. K.) See also Johnson and Asundi. Atom, many-electron, relativistic theory (Gaunt), 163. Bhagavantam (S.) The Magnetic Anisotropy of Naphthalene Crystals, 545. Bickley (W. G.) Hydrodynamic Forces acting on a Cylinder in Motion, and the idea of a “ Hydrodynamic Centre,” 296. Brunt (D.) The Transfer of Heat by Radiation and Turbulence in the Lower Atmosphere, 201. Catalysis by silver of the union of hydrogen and oxygen (Chapman and Hall), 478. Cawood (W.) See Patterson and others. Chapman (D. L.) and Hall (W. K.) A Study of the Catalysis by Silver of the Union of Hydrogen and Oxygen, 478. Clark (R. J.) On the Direct Determination of the Electrostatic Moments of Molecules, 689. . Combination of hydrogen and oxygen (Thompson and Hinshelwood), 219. Curie point and magnetostriction (Fowler and Kapitza), 1. Darwin (G. C.) A Collision Problem in the Wave Mechanics, 375. Davidson (P. M.) See Richardson and Davidson. Davies (L. P.) The Soft X-Ray Emission from Various Elements after Oxidation, 268. Dispersion in metals, quantum theory (Kronig), 409. Duncan (W. J.) See Frazer and Duncan. Eddy (C. E.), Laby (T. H.) and Turner (A. H.) Analysis by X-Ray Spectroscopy, 249. Einstein’s unified field theory (McVittie), 366. Electrical condition of hot surfaces during adsorption (Finch and Stimson), 356. Electrons, emission from cold metals (Stem and others), 699. Finch (G. I.) and Hodge (D. L.) Gaseous Combustion in Electric Discharges, III, 303. Finch (G. I.) and Stimson (J. C.) The Electrical Condition of Hot Surfaces during the Adsorption of Gases, III, 356. Flint (H. T.) The First and Second Order Equations of the Quantum Theory, 143. Fowler (R. H.) and Kapitza (P.) Magnetostriction and the Phenomena of the Curie Point, 1. . Fowler (R. H.) and Wilson (A. H.) A Detailed Study of the “ Radioactive Decay ” of and the Penetration of a-Particles into a Simplified One-Dimensional Nucleus, 493. Fowler (R. H.) See also Stern and others. Frazer (R. A.) and Duncan (AY. J.) On the Criteria for the Stability of Small Motions, 642. Freeman (L. J.) Further Investigations of the Spectrum of Ionised Nitrogen, 654. VOL. CXXIV.—A. vm

Gaseous combustion in electric discharges (Finch and Hodge), 303. Gaunt (J. A.) The Relativistic Theory of an Atom with Many Electrons, 163. Germanium, arc spectrum (Rao), 465. Gillam (A. E.) and Morton (R. A.) The Absorption Spectra of Halogens and Inter-halogen, Compounds in Solution in CC14, 604. Gossling (B. S.) See Stern and others. Grace (S. F.) Internal Friction in certain Tidal Currents, 150. Hall (W. K.) See Chapman and Hall. Halogens and inter-halogen compounds, spectra (Gillam and Morton), 604. Hargreaves (J.) The Effect of a Nuclear Spin on the Optical Spectra, 568. Hartree (D. R.) See Waller and Hartree. Havelock (T. H.) The Dispersion of Double Refraction in Quartz, 46. Helium, metastable, action on metal (Oliphant), 228. Hill (M. J. M.), obituary notice, i. Hinshelwood (C. N.) See Thompson and Hinshelwood. Hodge (D. L.) See Finch and Hodge. Howland (R. C. J.) Stress Systems in an Infinite Strip, 89. Hurst (H. E.) The Suspension of Sand in Water, 196. Hydrocarbon chain compounds, structure and properties (Muller), 317. Hydrodynamic centre and forces on a cylinder in motion (Bickley), 296. Hydrogen ion concentration, influence on adsorption (Phelps and Peters), 554. Hydrogen spectrum, parhelium bands (Richardson and Davidson), 50, 69. Infra-red investigations of molecular structure (Snow and others), 442, 453. Ionisation by collision in monatomic gases (Townsend and MacCallum), 533. Iron, behaviour at Ac3 point (Quinney), 591. Johnson (R. C.) and Asundi (R. K.) The Structure of the High Pressure Carbon Bands and the Swan System, 668. Kapitza (P.) See Fowler and Kapitza. Kronig (R. de L.) The Quantum Theory of Dispersion in Metallic Conductors, 409. Laby (T. H.) See Eddy and others. Lyons (C. G.) and Rideal (E. K.) On the Stability of Unimolecular Films, 322, 333, 344* MacCallum (S. P.) See Townsend and MacCallum. McVittie (G. C.) On Einstein’s Unified Field Theory, 366. Magnetic anisotropy of naphthalene (Bhagavantam), 545. Magnetostriction and the Curie point (Fowler and Kapitza), 1. Molecules, electrostatic moments (Clark), 689. Monatomic gases, ionisation by collision (Townsend and MacCallum), 533. Morton (R. A.) See Gillam and Morton. Mott (N. F.) On the Interpretation of the Relativity Wave Equation for Two Electrons,. 422. The Scattering of Fast Electrons by Atomic Nuclei, 425. Muller (A.) The Connexion between the Zig-Zag Structure of the Hydrocarbon Chain and the Alternations in the Properties of Odd and Even Numbered Chain Compounds, 317. Nakaya (U.) On the Emission of Soft X-Rays by Different Elements, with reference to the Effect of Adsorbed Gas, 616. IX

Naphthalene, magnetic anisotropy (Bhagavantam), 545. Night sky, method of measuring light (Rayleigh), 395. Nitrogen, ionised, spectrum (Freeman), 654. Nuclear spin in optical spectra (Hargreaves), 568. Obituary notice :—M. J. M. Hill, i. Oliphant (N. L.) The Action of Metastable Atoms of Helium on a Metal Surface, 228. Patterson (H. S.), Whytlaw-Gray (R.) and Cawood (W.) The Process of Coagulation in Smokes, 502. The Structure and Electrification of Smoke Particles, 523. ° Perturbation theory in quantum mechanics (Wilson), 176. Peters (R. A.) See Phelps and Peters. Petroleum, theory of cracking (Wilson), 16. Phelps (H. J.) and Peters (R. A.) The Influence of Hydrogen Ion Concentration on the Adsorption of Weak Electrolytes by Pure Charcoals, 554. • Quantum theory, first and second order equations (Flint), 143. Quantum theor}^ of dispersion in metallic conductors (Kronig), 409. Quartz, dispersion of double refraction (Havelock), 56. Quinney (H.) A Comparison between the Behaviour at the Ac3 Point of Single Crystal Iron and Polycrystal Iron, 591. Radiation heat transfer and turbulence (Brunt), 201. Radioactive decay (Fowler and Wilson), 493. Rao (K. R.) The Arc Spectrum of Germanium, 465. Rawlins (F. I. G.) See Shaw and others. Rayleigh (Lord) A Photoelectric Method of Measuring the Light of the Night Sky with Studies of the Course of Variation through the Night, 395. Richardson (O. W.) and Davidson (P. M.) The Spectrum of H2 : the Bands analogous to the Parhelium Line Spectrum, 50, 69. Richardson (0. W.) and Robertson (F. S.) The Emission of Soft X-Rays by Different Elements at Higher Voltages, 188. Rideal (E. K.) See Lyons and Rideal, and Snow and others. Robertson (F. S.) See Richardson and Robertson. Scattering of fast electrons by nuclei (Mott), 425. Smoke particles, structure and electrification (Patterson and others), 523. Smokes, coagulation (Patterson and others), 502. Snow (C. P.), Rawlins (F. I. G.) and Rideal (E. K.) Infra-Red Investigations of Molecular Structure, II, 453. Snow (C. P.) and Taylor (A. M.) Infra-Red Investigations of Molecular Structure, I, 442. Spectra, absorption, of halogens and inter-halogen compounds (Gillam and Morton), 604. Spectra of third positive carbon band (Asundi), 277. Spectra, optical, effect of nuclear spin (Hargreaves), 568. Spectrum, arc, germanium (Rao), 465. Spectrum, high pressure carbon bands (Johnson and Asundi), 668. Spectrum of H2, parhelium bands (Richardson and Davidson), 50, 69. Spectrum of ionised nitrogen (Freeman), 654. Stability of small motions, criteria (Frazer and Duncan), 642. Stern (T. E.), Gossling (B. S.) and Fowler (R. H.) Further Studies in the Emission of Electrons from Cold Metals, 699. Stimson (J. C.) See Finch and Stimson. Stress systems in an infinite strip (Howland), 89. Suspension of sand in water (Hurst), 196. Taylor (A. M.) See Snow and Taylor. Taylor (G. I.) The Criterion for Turbulence in Curved Pipes, 243. Thompson (H. W.) and Hinshelwood (C. N.) The Influence of Nitrogen Peroxide on the Combination of Hydrogen and Oxygen, 219. Tidal currents, internal friction (Grace), 150. Townsend (J. S.) and MacCallum (S. P.) Ionisation by Collision in Monatomic Gases* 533. Turbulence in curved pipes (Taylor), 243. Turner (A. H.) See Eddy and others. Unimolecular films, stability (Lyons and Rideal), 322, 333, 344. Waller (I.) and Hartree (D. R.) On the Intensity of Total Scattering of X-Rays, 119. Wave equation for two electrons (Mott), 422. Wave mechanics, collision problem (Darwin), 375. Whytlaw-Gray (R.) See Patterson and others. Wilson (A. H.) Perturbation Theory in Quantum Mechanics, 176. Wilson (A. H.) See also Fowler and Wilson. Wilson (H. A.) The Theory of Cracking Petroleum, 16. X-ray, soft, emission (Davies), 268. X-ray spectroscopy, analysis by (Eddy and others), 249. X-rays, intensity of total scattering (Waller and Hartree), 119. X-rays, soft and adsorbed gas (Nakaya), 616. X-rays, soft, emission at higher voltages (Richardson and Robertson), 188. Zig-zag structure and properties of the hydrocarbon chain (Muller), 317.

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

May 2, 1929.

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

The Statutes relating to the Election of Fellows were read. A ballot was then taken and the following Candidates were declared duly elected into the Society :—

Allmand, Arthur John. Kapitza, Peter. Buller, Arthur Henry Reginald. Lang, William Dickson. Ellis, Charles Drummond. Mellanby, John. Fisher, Ronald Aylmer. Raper, Henry Stanley. Goldsbrough, George Ridsdale. Ricardo, Harry Ralph. Gray, James {Cambridge). Robinson, Harold Roper. Hinshelwood, Cyril Norman. Twort, Frederick William. Imms, Augustus Daniel.

The following papers were read :—

I. J. S. H aldane, F.R.S., W. H ancock and A. G. R. White- house. “ The Loss of Water and Salts through the Skin, and the Corresponding Physiological Adjustments.”

II. F. H. A. Marshall, F.R.S., and J. Hammond. “ Oestrus and Pseudo-Pregnancy in the Ferret.”

III. R. G. Canti and F. G. Spear. “ The Effect of Gamma Irradiation on Cell Division in Tissue Culture in vitro .” Communicated by Sir Frederick Andrewes, F.R.S.

IV. R. B. Bourdillon, C. Fischmann, R. G. C. Jenkins and T. A. Webster. “ The Absorption Spectrum of Vitamin D .” Communicated by H. H. D ale, Sec.R.S.

V. G. E. Briggs. “ Experimental Researches on Vegetable Assimilation and Respiration.—XX.” Communicated by F. F. Blackman, F.R.S.

VI. R. J. Lythgoe and K. Tansley. “ The Relation of the Critical Frequency of Flicker to the Adaptation of the Eye.” Communicated by Sir John Parsons, F.R.S.

VII. R. H ill. “ Reduced Haematin and Haemochromogen.” Communicated by Sir Frederick H opkins, F.R.S.

VIII. G. R. de Beer. “ The Development of the Skull of the Shrew.” Communicated by E. S. Goodrich, F.R.S. [ ii J

IX. J. W. Pickering. 44 The Influence of W itte’s 4 Peptone,’ and of Digestion on Blood Platelets and Plasma.” Com­ municated by W. D. H alliburton, F.R.S.

X. F. W. R. Brambell and A. S. Parkes. 44 Compensatory Hypertrophy of the Untreated Ovary after Unilateral X-ray Sterilisation.” Communicated by J. P. H ill, F.R.S.

XI. W. Moppett. 44 The Differential Action of X-rays in Relation to Biology, Chemistry and Physics.—I.” Com­ municated by J. T. Wilson, F.R.S.

XII. C. H. Browning, F.R.S., J. B. Cohen, F.R.S., S. E lling- worth and R. Gulbransen. 44 The Trypanicidal Action of some Derivatives of Anil and Styryl Quinoline.”

May 9, 1929.

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

Prof. A. J. Allmand, Mr. C. N. Hinshelwood, Dr. A. D. Imms, Dr. P. Kapitza, H. R. Ricardo, Esq., and Prof. F. W. Twort were admitted into the Society.

The following papers were read :—

I. R, H. F owler, F.R.S., and P. Kapitza. “ Magneto­ striction and the Phenomena of the Curie Point.”

II. C. G. D arwin, F.R.S. 44 A Collision Problem in the Wave Mechanics.”

III. J. A. Gaunt. 44 The Relativistic Theory of an Atom with Many Electrons.” Communicated by R. H. F owler, F.R.S.

IV. R. de L. K ronig. 44 The Quantum Theory of Dispersion in Metallic Conductors.” Communicated by R. H. F owler, F.R.S.

V. N. F. Mott. 44 The Interpretation of the Wave Equation for Two Electrons.” Communicated by R. H. F owler, F.R.S. VI. G. I. Taylor, F.R.S. 44 The Criterion for Turbulence in Curved Pipes.” [ iii ]

VII. H. J. P helps and R. A. P eters. “ The Influence of Hydrogen Ion Concentration on the Absorption of Weak Electrolytes by Pure Charcoals.” Communicated by Sir Harold H artley, F.R.S.

VIII. R, K. Asundi. “ The Third Positive Carbon and Asso­ ciated Bands.” Communicated by 0. W. R ichardson F.R.S.

IX. F. J. Wilkins. “ The Kinetics of the Oxidation of Copper. Part I.” Communicated by T. M. Lowry, F.R.S.

X. C. E. E ddy, T. H. Laby, and A. H. Turner. “ Analysis by X-Ray Spectroscopy.” Communicated by Sir Ernest R utherford, P.R.S.

XI. M. C. J ohnson. “ The Adsorption of Hydrogen on the Surface of an Electrodeless Discharge Tube.” Com­ municated by S. W. J. Smith, F.R.S. fc XII. A. E lliott. “ The Absorption Band Spectrum of Chlorine.” Communicated by T. H. H avelock, F.R.S.

XIII. H. W. Thompson and C. N. H inshelwood. “ The Influence of Nitrogen Peroxide on the Combination of Hydrogen and Oxygen.” Communicated by Sir Harold Hartley, F.R.S.

XIV. H. T. F lint. “ The First and Second Order Equations of the Quantum Theory.” Communicated by 0. W. R ichardson, F.R.S.

XV. S. B hagavantam. “ The Magnetic Anistropy of Naphtha­ lene Crystals.” Communicated by C. V. R aman, F.R.S.

XVI. A. H. Wilson. “ Perturbation Theory in Quantum Mechanics. II.” Communicated by R. H. F owler, F.R.S.

XVII. C. G. Lyons and E. K. R ideal. “ On the Stability of Unimolecular Films. Parts I, II and III.” Communi­ cated by Sir William H ardy, F.R.S.

XVIII. P. A. M. D irac. “ Quantum Mechanics of Many-Electron Systems.” Communicated by R. H. F owler, F.R.S.

XIX. 0. W. R ichardson, F.R.S., and P. M. D avidson. “ The Spectrum of II2. The Bands Analogous to the Parhelium Line Spectrum. Parts III and IY.”

XX. H. E. H urst. “ The Suspension of Sand in Water.” Communicated by G. C. Simpson, F.R.S. [ iv ]

XXI. D. Brunt. 44 The Transfer of Heat by Radiation and Turbulence in the Lower Atmosphere.” Communicated by G. C. Simpson, F.R.S.

XXII. W. G. Bickley. 44 Hydrodynamic Forces acting on a Cylinder in Motion, and the Idea of a 4 Hydrodynamic Centre \ ” Communicated by G. I. Taylor, F.R.S.

XVIII. M. L. E. Oliphant. 44 The Action of Metastable Atoms of Helium on a Metal Surface.” Communicated by Sir Ernest R utherford, P.R.S.

XXIV. J. H argreaves. 44 The Effect of a Nuclear Spin on the Optical Spectra.” Communicated by R. H. F owler, F.R.S.

XXV. M. N. Saha, F.R.S., and R amash Chandra. 44 New Methods in Statistical Mechanics.”

May 30, 1929.

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

Prof. A. Bracket (Foreign Member), Dr. C. D. Ellis, Dr. R. A. Fisher, Prof. G. R. Goldsbrough, Prof. J. Mellanby, Prof. H. S. Raper and Prof. H. R. Robinson were admitted into the Society. The following papers were read :—

I. 0. W. R ichardson, F.R.S., and P. M. D avidson. 44 The Energy Function of the H2 Molecules.”

II. E. K. R ideal, C. P. Snow, F. I. G. R awlins and A. M. Taylor. 44 Infra-Red Investigations of Molecular Struc­ ture. Part I.” Communicated by T. M. Lowry, F.R.S.

III. C. P. Snow, F. I. G. R awlins and E. K. Rideal. 44 Infra­ Red Investigations of Molecular Structure. Part II.” Communicated by T. M. Lowry, F.R.S.

IV. A. Muller. 44 The Connection between the Zig Zag Structure of the Hydrocarbon Chain and the Alternations in the Properties of odd and even numbered Chain Com­ pounds.” Communicated by Sir William Bragg, F.R.S.

V. 0. W. Richardson, F.R.S., and F. S. R obertson. 44 The Emission of Soft X-Rays by different Elements at higher Voltages.” [ V ]

VI. L. P. D avies. “ The Soft X-Ray Emission from Various Elements after Oxidation.” Communicated by 0. W. R ichardson, F.R.S.

VII. D. L. Chapman, F.R.S., and W. K. H all. 44 A Study of the Catalysis by Silver of the Union of Hydrogen and Oxygen.”

VIII. R. H. F owler, F.R.S., and A. H. Wilson. 44 A Detailed Study of the 4 Radio-active Decay 5 of, and the Penetra­ tion of a-Partides into a Simplified One-Dimensional Nucleus.” IX. G. I. F inch and D. L. H odge. 44 Gaseous Combustion in Electric Discharge. Part III.” Communicated by W. A. B one, F.R.S.

X. G. I. F inch and J. C. Stimson. 44 The Electrical Con­ dition of Hot Surfaces during the Adsorption of Gases. Part III.” Communicated by W. A. B one, F.R.S.

XI. J. M. R obertson. 44 An X-Ray Investigation of the Structure of Naphthalene and Anthracene.” Com­ municated by Sir William Bragg, F.R.S.

XII. K. Majumdar. 44 The Arc Spectrum of Chlorine.” Com­ municated by M. N. Saha, F.R.S.

XIII. K. R. R ao. 44 The Arc Spectrum of Germanium.” Com­ municated by A. F owler, F.R.S.

XIV. U. Nakaya. 44 On the Emission of Soft X-Rays by Different Elements, with reference to the Effect of Ad­ sorbed Gas.” Communicated by 0. W. Richardson, F.R.S.

XV. N. F. Mott. 44 The Scattering of Fast Electrons by Atomic Nuclei.” Communicated by N. Bohr, F.M.R.S.

XVI. L. J. F reeman. 44 Further Investigations of the Spectrum of Ionised Nitrogen (N. II).” Communicated by A. F owler, F.R.S.

XVII. A. E. Gillam and R. A. Morton. 44 The Adsorption Spectra of Halogens and Inter-Halogen Compounds in Solution in Carbon Tetrachloride.” Communicated by E. C. C. Baly, F.R.S.

XVIII. R. A. F razer and W. J. D uncan. 44 On the Criteria for the Stability of Small Motions.” Communicated by H. Lamb, F.R.S.

XIX. R. A. F razer and W. J. D uncan. 44 On the Numerical Solution of Equations with Complex Roots.” Com­ municated by H. Lamb, F.R.S. [ vi ]

XX. G. C. McVitie. “ On Einstein’s Unified Field Theory.” Communicated by A. S. E ddington, F.R.S.

June 6, 1929.

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

Prof. A. H. R. Buller and Dr. W. D. Lang were admitted into the Society.

Prof. E. A. Milne, F.R.S., delivered the Rakerian Lecture on “ The Structure and Opacity of a Stellar Atmosphere.”

June 13, 1929.

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

The following papers were read :—

I. W. S. Stiles. ££ The Scattering Theory of the Effect of Glare on the Brightness Difference Threshold.” Com­ municated by Sir John Parsons, F.R.S.

II. G. B riscoe and W. Leyshon. ££ Reciprocal Contraction of Antagonistic Muscles in Peripheral Preparations—using Flashing Neon Lamp Circuit for Excitation of Nerve. Communicated by Sir Charles Sherrington, F.R.S.

III. T. Moran. “ Critical Temperature of Freezing—Living Muscle.” Communicated by Sir William H ardy, F.R.S.

IV. E. C. Smith. ££ The Formation of Lactic Acid in Muscles in the Frozen State.” Communicated by Sir William H ardy, F.R.S.

V. F. M. L. Sheffield. ££ Chromosome Linkage in Oenothera, with special reference to some Fx Hybrids.” Communicated by Sir John F armer, F.R.S.

VI. A. C. D owning and A. V. H ill, F.R.S. ££ A New Thermo­ pile for the Measurement of Nerve Heat-production.”

VII. A. V. H ill, F.R.S. ££ The Heat-production and Recovery of Crustacean Nerve.” [ vii ]

June 20, 1929.

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

Sir Charles Sherrington, O.M., F.R.S., delivered the F errier Lecture on 44 Some Functional Problems attaching to Convergence.”

June 27, 1929.

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

The following papers were read

I. Lord R ayleigh, F.R.S. 44 A Photoelectric Method of Measuring the Light of the Night S ky: with Studies of the Course of Variation through the Night.”

II. J. C. McLennan, F.R.S., M. W. Perrin and H. J. C. Ireton. “ The Action of High-Speed Cathode Rays on Acetylene.”

III. Lord R ayleigh, F.R.S. “ Fluorescent and Phosphorescent Excitation of Mercury Vapour by the Resonance Fre­ quency and Lower Frequencies.”

IV. T. E. Stern, B. S. Gossling and R. H. F owler, F.R.S. 44 Further Studies in the Emission of Electrons from Cold Metals.”

V. A. E. H. Love, F.R.S. 44 The Stress Produced in a Semi­ Infinite Solid by Pressure on Part of the Boundary.”

VI. A. N. Shaw, H. E. R eilley and R. J. Clark. 44 The Ageing of Standard Cells : Increased Accuracy in their Use : and International Comparisons.” Communicated by A. S. Eve, F.R.S.

VII. H. Quinney. 44 A Comparison between the Behaviour at the Ac3 Point of Single Crystal Iron and Polycrystal Iron, both in the Strained and Unstrained States.” Communicated by G. I. Taylor, F.R.S. VIII. J. N. P ring and G. M. Westrip. 44 An Electrometric Method for the Determination of Ozone at High Dilu­ tions.” Communicated by Sir Ernest Rutherford, P.R.S.

IX. C. F. J enkin and G. I). Lehmann. 44 High-Frequency Fatigue.” Communicated by Sir Richard Glazebrook, F.R.S. [ viii ]

X. J. S. Townsend, F.R.S., and S. P. MacCallum. 44 Ionisa­ tion by Collision in Monatomic Gases. ”

XI. R. C. J ohnson and R. K. A sundi. 44 The Structure of the High Pressure Carbon Bands and the Swan System.” Communicated by T. R. Merton, F.R.S.

XII. D. M. N ewitt. 44 Gaseous Combustion at High Pressures. Part XIII.” Communicated by W. A. B one, F.R.S.

XIII. R. J. Clark. 44 On the Direct Determination of the Electro­ static Moments of Molecules.” Communicated by Sir Ernest Rutherford, P.R.S. XIV. A. R. Low. 44 On the Criterion for Stability of a Layer of Viscous Fluid Heated from below.” Communicated by L. N. G. F ilon, F.R.S.

XV. R. B. B rode. 44 The Absorption Coefficient for Slow Electrons in Mercury Vapour. Communicated by F. A. Lindemann, F.R.S.

XVI. F. L. U sher. 44 A Mechanism of Gelatinisation.” Com­ municated by R. Whytlaw-Gray, F.R.S.

XVII. H. R. H asse and W. R. Cook. 44 The Determination of Molecular Forces from the Viscosity of a Gas.” Com­ municated by S. Chapman, F.R.S.

XVIII. J. C. McLennan, F.R.S., A. B. McLay and M. F. Craw­ ford. 44 The Spark Spectrum of Thallium (T1 III).”

XIX. R. A. F isher, F.R.S. 44 Tests of Significance in Harmonic Analysis.”

XX. F. H. Constable. 44 Sulphide Colours on Metallic Copper.” Communicated by T. M. Lowry, F.R.S.

XXI. G. I. Taylor, F.R.S. 44 Waves and Tides in the Atmo­ sphere.”

XXII. R. W. B. Pearse. 44 The Ultra-Violet Spectrum of Mag­ nesium Hydride II.” Communicated by A. F owler, F.R.S.

XXIII. G. Temple. 44 The Second-Order Wave Equations of the Spinning Electron.” Communicated by S. Chapman, F.R.S.

XXIV. A. V. H ill, F.R.S. 44 Anaerobic Survival in Muscle.”

XXV. G. A. Scott. “ The Isotherms of Hydrogen, Carbon Monoxide and their Mixtures.” Communicated by W. A. B one, F.R.S. [ ix ]

XXVI. N. F. Mott. “ The Exclusion Principle and Aperiodic Systems.” Communicated by R. H. F owler, F.R.S.

XXVII. S. Chandrasekhar,. “ The Compton Scattering and the New Statistics. ” Communicated by R. H. F owler, F.R.S.

XXVIII. N. J. B errill. 44 Studies in Tunicate Development. Part I.” Communicated by D. M. S. Watson, F.R.S.

XXIX. J. L. Shellshear. “ A Study of the Arteries of the Brain of the Spiny Ant-eater {Echidna aculeata)” Communicated by G. E. Smith, F.R.S.

XXX. H. M. Carleton. “ The Delayed Effects of Pericardian Removal.” Communicated by Sir Charles Sherrington, F.R.S.

XXXI. S. Cooper and D. D enny-B rown. “ The Interaction between Two Trains of Impulses converging on the same Motoneurone.” Communicated by Sir Charles Sherrington, F.R.S.