INDEX to VOL. CII. (A)

Absorption bands, wave-lengtli measurement of (Hartridge), 575. Address of the President, 1922, 373. a- and /3-rays, theory of scattering (Jeans), 437. a-particle passing through matter, changes in charge of (Henderson), 496. «-ray, loss of energy of, in passage through matter (Kapitza), 48. a-ray photographs, analysis of (Blackett), 294. Aluminium crystal, distortion during tensile test (Taylor and Elam), 643. Argon, ionisation by electron collisions (Horton and Davies), 131. Armstrong (E. F.) and Hilditch (T. P.) A Study of Catalytic Action at Solid Surfaces.— Part VIII, 21 ; Part IX, 27. Astbury (W. T.) The Crystalline Structure and Properties of Tartaric Acid, 506. Atmosphere, outer, and theory of meteors (Lindemann and Dobson), 411. Atmospheric disturbances, directional observations of (Watt), 460. Atomic hydrogen, incandescence in (Wood), 1.

Backliurst (I.) Variation of the Intensity of Reflected X-radiation with the Tem­ perature of the Crystal, 340. Bakerian Lecture (Taylor and Elam), 643. Berry (A.) and Swain (L. M.) On the Steady Motion of a Cylinder through Infinite Viscous Fluid, 766. /3-rays, scattering of (Wilson), 9. Blackett (P. M. S.) On the Analysis of u-Ray Photographs, 294. Brodetsky (S.) The Line of Action of the Resultant Pressure in Discontinuous Fluid Motion, 361 ; ----- Discontinuous Fluid Motion past Circular and Elliptic Cylinders 542. Cale (F. M.) See McLennan and Cale. Campbell (J. H. P.) See Whytlaw-Gray. Carbon arc ultra-violet spectrum (Simeon), 484. Catalytic Action (Armstrong and Hilditch), 21, 27. Christie (Sir W.) Obituary notice of, xi. Clark (M. L.) See McLennan and Clark. Colloidal behaviour, theory of (Hill), 705. Colloids, periodic opacity of (Holker), 710. Colour vision, investigation by Rayleigh test (Houstoun), 353. Copper films, structure and chemical activity of (Hinshelwood), 318. Cyanogen spectrum, note on origin of (Rayleigh), 453.

Davies (A. C.) See Horton and Davies. Davy (N.) See Shaw and Davy. Dobson (G. M. B.) See Lindemann and Dobson. Donnan equilibrium and colloidal theory (Hill), 705.

Earthquake wave propagation (Jeans), 554. Eddington (A. S.) The Propagation of Gravitational Waves, 268. XXXV111

Elam (C. F.) See Taylor (G. I.) and Elam (C. F.). Electric discharge, evolution of heat and supply of energy during (Roberts), 72. Electrode potential drop, measurements of, with electrolysis (Marsh and Evans), 328. Electrode, potential, significance of (Heyrovsk^), 628. Electrolytes, opacity of colloids in (Holker), 710. Electrons from tungsten filament, energy of (Jones), 734. Evans (A. E.) See Marsh and Evans.

Fluid motion, discontinuous (Brodetsky), 361, 542. Fluid, motion of cylinder through (Berry and Swain), 766 ; of particles in (Jeffery), 161. Fluorescence of sesculin (McLennan and Gale), 256. Gowland (W.) Obituary notice of, xvi. Grace (S. F.) Free Motion of a Sphere in a Rotating Liquid parallel to the Axis of Rotation, 89. Gravitational waves, propagation of (Eddington), 268. Gravitative attraction, effect of temperature on (Shaw), 46. Grove-Hills (E. H.) Obituary notice of, xx. Gyromagnetic ratio, magnitude of (Richardson), 538.

Haloes, pleochroic, of various geological ages (Joly), 682. Hartridge (11.) The Coincidence Method for the Wave-length Measurement of Absorp­ tion Bauds, 575. Henderson (G. H.) Changes in the Charge of an a-Particle passing through Matter, 496. Hevrovsky (J.) The Significance of the Electrode Potential, ,628. Hicks (W. M.) On the Mutual Threading of Yortex Rings, 111. Hilclitch (T. P.) See Armstrong and Hilditch. Hill (A. V.) The Potential Difference occurring in a Donnan Equilibrium and the Theory of Colloidal Behaviour, 705. Hinshelwood (C. N.) On the Structure and Chemical Activity of Copper Films, 318. Holker (J.) The Periodic Opacity of Certain Colloids in progressively increasing Con­ centrations of Electrolytes, 710. Horton (F.) and Davies (A. C.) A Spectroscopic Investigation of the Ionisation of Argon by Electron Collisions, 131. Houstoun (R. A.) An Investigation of the Colour Vision of 527 Students by the Rayleigh Test, 353. Hydrogen, incandescence in atomic (Wood), 1. Hydrogen positive rays and field of force (Thompson), 197. Hydrogenation of phenol (Armstrong and Hilditch), 21.

Ionisation of argon by electron collisions (Horton and Davies), 131. Ionising potentials, new method for studying (Smyth), 283. Iridescent colour and structure (Rayleigh), 668, 674. Iron and steel at temperatures below 280° C. (Thompson and Whitehead), 587.

Jackson (L. C.) and Onnes (H. K.) Investigations on the Paramagnetic Sulphates at Low Temperatures, 678 ; ------Investigations on the Paramagnetism of Crystals at Low Temperatures, 680. Jeans (J. H.) The Theory of the Scattering of a- and /3-rays, 437 ; ----- The Propaga­ tion of Earthquake Waves, 554. Jeffery (G. B.) The Motion of Ellipsoidal Particles immersed in a Viscous Fluid, 161. Joly (J.) Pleochroic Haloes of Various Geological Ages, 682. XXXIX

Jones (J. H.) The Kinetic Energy of Electrons emitted from a Hot Tungsten Filament, 734.

Kapitza (P. L.) The Loss of Energy of an a-Ray Beam in its Passage through Matter. Part I.— Air and C02, 48. Kapteyn (J. C.) Obituary notice of, xxix. Kempe (Sir A. B.) Obituary notice of, i. Knott (C. G.) Obituary notice of, xxvii.

Light, molecular scattering in vapours and liquids (Ramanathan), 151. Light, scattered by mercury vapour, polarisation of (Rayleigh), 190. Lindemann (F. A.) and Dobson (G. M. B.) A Theory of Meteors, and the Density and Temperature of the Outer Atmosphere to which it leads, 411. Liquid, rotating (Grace), 89 ; (Taylor), 180. Lubrication, cylindrical journal, at high eccentricity (Stanton), 241.

McAulay (A.) Multenions and Differential Invariants.—II, 210. McLennan (J. C.) and others. On the Absorption of X 5460‘97 A. by Luminous Mercury Vapour, 33. McLennan (J. C.) and Cale (F. M.) On the Fluorescence of iEsculin, 256. McLennan (J. C.) and Clark (M. L.) On the Excitation of Characteristic X-Rays from Light Elements, 389. Marsh (S.) and Evans (A. E.) On Measurements of Electrode Potential Drop with Direct and Alternating Current Electrolysis, 328. Mercury vapour, absorption of X 5460 97 A. by (McLennan and others), 33. Meteors, theory of (Lindemann and Dobson), 411. Mosharrafa (A. M.) On the Quantum Theory of the Simple Zeeman Effect, 529. Multenions and invariants (McAulay), 210. Nitrogen, spectrum of active (Rayleigh), 453. Obituary Notices of Fellows deceased :— Kempe (A. B.), i. Grove-Hills (E. H.), xx. Christie (W. H. M.), xi. Walker (G. W.), xxii. Gowland (W.), xvi. Knott (C. G), xxvii. Kapteyn (J. C.), xxix.

Onnes (H. K.) See Jackson and Onnes. Paget (Sir R. A. S.) The Production of Artificial Vowel Sounds, 752. Paramagnetic sulphates and crystals at low temperatures (Jackson and Onnes), 678, 680. Quantum theory and electro-magnetic phenomena ( Wilson), 478. Quartz, effect of long grinding on (Ray), 640. Ramanathan (K. R.) The Molecular Scattering of Light in Vapours and in Liquids and its Relation to the Opalescence observed in the Critical State, 151. Ray (R. .C.) The Effect of Long Grinding on Quartz (Silver Sand), 640. Rayleigh (Lord) Polarisation of the Light Scattered by Mercury Vapour near the Resonance Periodicity, 190; ----- Spectrum of Active Nitrogen as Affected by Admixture of the Inert Gases, with Note on Origin of Cyanogen Spectrum, 453; ----- Studies of Iridescent Colour, and the Structure producing it.—I. Colours of Potassium Chlorate Crystals, 668 ; II. Motlier-of-Pearl, 674.

* x l

Richardson (O. W.) The Magnitude of the Gyromagnetic Ratio, 538. Roberts (J. K.) The Relation between the Evolution of Heat and the Supply of Energy during the Passage of an Electric Discharge through Hydrogen, 72. Rotating liquid, motion of sphere in (Grace), 89 ; (Taylor), 180. Shaw (P. E.) and Davy (N.) The Effect of Temperature on Gravitative Attraction, 46. Sherrington (Sir C. S.) Presidential Address, 1922, 373. Simeon (F.) The Carbon Arc Spectrum in the Extreme Ultra-violet, 484. Smokes, behaviour, number and size of particles (Whytlaw-Gray and others), 600. Smyth (H. D.) A New Method for Studying Ionising Potentials, 283. Speakman (J. B.) See Whytlaw-Gray. Sphere in rotating liquid, motion of (Grace), 89 ; (Taylor), 180. Stanton (T. E.) On the Characteristics of Cylindrical Journal Lubrication at High Values of the Eccentricity, 241. Swain (L. M.) See Berry and Swain. Tartaric acid, crystalline structure and properties (Astbury), 506. Taylor (G. I.) The Motion of a Sphere in a Rotating Liquid, 180 ; ----- Stability of a Viscous Liquid contained between Two Rotating Cylinders, 541. Taylor (G. I.) and Elam (C. F.) The Distortion of an Aluminium Crystal during a Tensile Test, 643. Tensile distortion of aluminium (Taylor and Elam), 643. Thompson (F. C.) and Whitehead (E.) On the Changes in Iron and Steel at Tem­ peratures below 280° C., 587. Thomson (G. P.) The Scattering of Hydrogen Positive Rays, and the Existence of a Powerful Field of Force in the H Molecule, 197. .f Ultra-violet carbon arc spectrum (Simeon), 484. Viscous fluid, motion of particles in (Jeffery), 161. Vortex rays, mutual threading of (Hicks), 111. Vowel sounds, production of artificial (Paget), 752. Walker (G. W.) Obituary notice of, xxii. Watt (R. A. W.) Directional Observations of Atmospheric Disturbances, 1920-21, 460. Whitehead (E.) See Thompson and Whitehead. Whytlaw-Gray (R. and others) Smokes. Part I.—-A Study of Behaviour and Number of Particles, 600. Part II.—Size of the Particles, 615. Wilson (H. A.) On the Scattering of /3-Rays, 9. Wilson (W.) The Quantum Theory and Electromagnetic Phenomena, 478. Wood (R. W.) Spontaneous Incandescence of Substances in Atomic Hydrogen Gas, 1. X-radiation, variation of the intensity of reflected (Backhurst), 340. X-rays, excitation of, from light elements (McLennan and Clark), 389. Zeeman effect, quantum theory of (Mosliarrafa), 529.

end of the hundred and second volume (series a). MINUTES OF MEETINGS.—SESSION 1921-22.

November 2, 1922. Sir CHARLES SHERRINGTON, President, in the Chair. The following papers were read :— I. “ Polarization of the Light Scattered by Mercury Vapour near the Resonance Periodicity.” By Lord Rayleigh, F.R.S. II. “ The Scattering of Hydrogen Positive Rays and the Existence of a Powerful Field of Force in the Hydrogen Molecule.” Bjr G. P. Thomson. Communicated by Sir J. J. Thomson, F.R.S. III. “ A New Method for Studying Ionizing Potentials.”- By H. I). Smyth. Communicated by Sir Ernest R utherford, F.R.S. IV. “ Variation of the Intensity of Reflected X-Radiation with the Temperature of the Crystal.” By I. Backiiurst. Com­ municated by Sir W illiam Bragg, F.R.S. V. “ The Absorption Spectrum of Potassium Vapour.” By S. Datta. Communicated by Prof. A. F owler, F.R.S. VI. “ The Molecular Scattering of Light in Vapours and in Liquids, and its Relation to the Opalescence observed in the Critical State.” By K. R. Ramanathan. Communicated by Dr. G. T. W alker, F.R.S.

November 9, 1922, Sir CHARLES SHERRINGTON, President, in the Chair. In pursuance of the Statutes, notice of the ensuing Anniversary Meeting was given from the Chair. The following papers were read :— I. “ Studies on Enzyme Action. XXIII.—Homo- and Hetero-lytic Enzymes.” By Prof. H. E. Armstrong, F.R.S. II. “ The Oxygen-dissociation Curve of Blood and its Thermo­ dynamical Basis.” By Prof. A. V. H ill, F.R.S., and W. E. L. Brown. III. “ The \ elocity with which CO replaces Oxygen from its Com­ bination with Haemoglobin.—Parts I and II.” By H. Hartridge, M.D., and F. J. W. Boughton. Communicated by Prof. F. G. Hopkins, F.R.S. IV. “ Studies on Internal Secretion.—I. The Effect of Pituitary (Anterior Lobe) Injection upon Normal and Thyroidectomised Axolotls.” By L. T. Hogben. Communicated by Prof. E. W. MacBride, F.B.S. V. “ The Pigmentary Effector System.—II.” By L. T. H ogben and F. R. W inton. Communicated by Prof. E. W. MacBride. F. R.S. YL “ Further Observations on a Bacteriolytic Element found in Tissues and Secretions.” By A. F leming and Y. D. Allison. Communicated by Sir Almroth W right, F.E.S.

November 16, 1922. Sir CHARLES SHERRINGTON, President, in the Chair. In pursuance of the Statutes, notice of the ensuing Anniversary Meeting was given from the Chair. The following papers were read :— I. “ The Propagation of Gravitational Waves.” By A. S. Eddington, F.R.S. II. “ The Theory of the Scattering of «- and B-Rays.” By J. H. J eans, D.Sc., Sec. R.S. III. “ On the Richardson Gyro-magnetic Effect.” By A. P. Chattock, F.R.S., and L. F. Bates. IY. “ On the Analysis of a-Ray Photographs.” By P. M. S. Blackett. Communicated by Sir , F.R.S. Y. “ The Kinetic Energy.of Electrons emitted from a Hot Tungsten Filament.” By J. H. J ones. Communicated by Prof. 0. W. Richardson, F.R.S. YI. “ The Quantum Theory and Electromagnetic Phenomena.” By AY. W ilson, D.Sc. Communicated by Prof. J. W. Nichol­ son, F.R.S. VII. “ On Measurements of Electrode Potential Drop with Direct Current and Alternating Current Electrolysis.” By S. Marsh and A. E. Evans. Communicated by Dr. E. H. Griffiths, F.R.S.

November 23, 1922. Sir CHARLES SHERRINGTON, President, in the Chair. A Special General Meeting of the Society was held to receive the Annual Report of Council. November 23, 1922.

Sir CHARLES SHERRINGTON, President, in tire Chair. In pursuance of the Statutes, notice of the ensuing Anniversary Meeting was given from the Chair, and the List of Officers and Council nominated for election was read as follows:—

President.—Sir Charles Scott Sherrington, G.B.E., M.D., Sc.D. Treasurer.—Sir David Prain, C.M.G., C.I.E. 0 . f William Bate Hardy, M.A. ' l James Hopwood Jeans, M.A., D.Sc., LL.I). Foreign Secretary.—Sir , Sc.D.

Other Members ofthe Council.—Prof. Vernon Herbert Blackman,. Sc.D.; Prof. Henry Cort Harold Carpenter, M.A.; Prof. Thomas- Renton Elliott, M.D.; Prof. Arthur Harden, D.Sc.; Sir Sidney Frederic Harmer, K.B.E., Sc.D.; Prof. William Mitchinson Hicks, M.A.; Prof. Hugh Frank Newall, M.A.; Prof. George Henry Falkiner Nuttall, Sc.D.; Prof. Diarmicl Noel Paton, M.D.; The Lord Rayleigh, Sc.D. - Prof. Owen Willans Richardson, D.Sc.; Sir Ernest Rutherford, D.Sc. y Dr. Alexander Scott; Frank Edward Smith; Sir Aubrey Stralian, K.B.E., Sc.D. ; Prof. James Thomas Wilson, M.B.

The following papers were read :— I. “ On the Characteristics of Cylindrical Journal Lubrication at High Values of the Eccentricity.” By Dr. T. E. Stanton,. F.R.S. II. “ The Propagation of Earthquake Waves.” By J. H. J eans, Sec. R.S. III. “ A Theory of Meteors and the Density and Temperature of the Outer Atmosphere to which it Leads.” By Prof. F. A. • Lindemann, F.R.S., and G. M. B. Dobson. IV. “ On the Changes in Iron and Steel at Temperatures below 280° C.” By Prof. F. C. Thompson and E. W hitehead, Communicated by Prof. H. C. H. Carpenter, F.R.S. V. “ The Fatigue Failure of Metals.” By C. F. J enkin. Com­ municated by Sir Alfred Ewing, F.R.S. VI. “ The Line of Action of the Resultant Pressure in Discontinuous Fluid Motion.” By S. Brodetsky. Communicated by Sir George Greeniiill, F.R.S. VII. “ An Investigation of the Colour Vision of 527 Students by tho Rayleigh Test.” By Dr. R. A. H oustoun. Communicated by Prof. A. Gray, F.R.S. November 23, 1922.

Sir CHARLES SHERRINGTON, President, in the Chair. In pursuance of the Statutes, notice of the ensuing Anniversary Meeting was given from the Chair, and the List of Officers and Council nominated for election was read as follows:—

President.—Sir Charles Scott Sherrington, G.B.E., M.D., Sc.D. Treasurer.—Sir David Prain, C.M.G., C.I.E. o . • f William Bate Hardy, M.A. ecu ana,, James Hopwood Jeans, M.A., D.Sc., LL.D.

Foreign Secretary.—Sir Arthur Schuster, Sc.D.

Other Members of the Council.—Prof. Vernon Herbert Blackman, Sc.D.; Prof. Henry Cort Harold Carpenter, M.A.; Prof. Thomas Renton Elliott, M.D.; Prof. Arthur Harden, D.Sc.; Sir Sidney Frederic Harmer, K.B.E., Sc.D.; Prof. William Mitchinson Hicks, M.A.; Prof. Hugh Frank Newall, M.A.; Prof. George Henry Falkiner Nuttall, Sc.D.; Prof. Diarmid Noel Paton, M.D.; The Lord Rayleigh, Sc.D.; Prof. Owen Willans Richardson, D.Sc.; Sir Ernest Rutherford, D.Sc. ; Dr. Alexander Scott; Frank Edward Smith; Sir Aubrey Strahan, K.B.E., Sc.D. ; Prof. James Thomas Wilson, M.B.

The following papers were read:— I. “ On the Characteristics of Cylindrical Journal Lubrication at High Values of the Eccentricity.” By Dr. T. E. Stanton, F.R.S. II. “ The Propagation of Earthquake Waves.” By J. H. J eans, Sec. R.S. III. “ A Theory of Meteors and the Density and Temperature of the Outer Atmosphere to which it Leads.” By Prof. F. A. Lindemann, F.R.S., and G. M. B. Dobson. IV. “ On the Changes in Iron and Steel at Temperatures below 280° C.” By Prof. F. C. Thompson and E. Whitehead. Communicated by Prof. H. C. H. Carpenter, F.R.S. V. “ The Fatigue Failure of Metals.” By C. F. J enkin. Com­ municated by Sir Alfred Ewing, F.R.S. VI. “ The Line of Action of the Resultant Pressure in Discontinuous Fluid Motion.” By S. Brodetsky. Communicated by Sir George Greenhill, F.R.S. VII. “ An Investigation of the Colour Vision of 527 Students by the Rayleigh Test.” By Dr. R. A. Houstoun. Communicated by Prof. A. Gray, F.R.S.

a November 30, 1922.

Anniversary Meeting. Sir CHARLES SHERRINGTON, President, in the Chair. The Report of the Auditors of the Treasurer’s accounts was read, and the thanks of the Society were given to the Treasurer and to the Auditors.

The List of Fellows deceased and the List 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 W. Leishman, seconded by Prof. Graham Kerr, the thanks of the Society were voted to the President for his Address, and he was requested to allow it to be printed. The Awards of the Medals for the year were announced as follows, and the Medals were presented from the Chair:— The — To Sir Ernest Rutherford. The Rumford Medal. „ Prof. Pieter Zeeman. A ...... „ Mr. . A Royal Medal ...... „ Mr. C. T. R. Wilson. The Davy Medal __ „ Prof. Jocelyn Thorpe. The Darwin Medal . „ Prof. R. C. Punneti. The Buchanan Medal „ Sir David Bruce. The Sylvester Medal „ Prof. T. Levi-Civita. The Hughes Medal . „ Dr. F. W. Aston.

The President having, with the consent of the Society, nominated Dr. Bateson and Prof. Halliburton 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 nominated at the preceding meeting had been duly elected. The thanks of the Society were given to the Scrutators.

December 7, 1922. Sir CHARLES SHERRINGTON, President, in the Chair. The following Papers were read:— I. “ Spectrum of Active Nitrogen as affected by Admixture of the Inert Gases.” By Lord Rayleigh, F.R.S. II. “ Changes in the Charge of an a-Particle passing through Matter.” By G. H. H enderson, Ph.D. Communicated by Sir Ernest Rutherford, F.R.S. III. “ The Crystalline Structure and Properties of Tartaric Acid.” By W. T. Astbury. Communicated by Sir W illiam Bragg, F.R.S. IY. “ Sources of Error in the Measurement of the Electrical Charge of Colloidal Particles by the Method of Moving Boundaries.” By J. N. Mukiierjee. Communicated by Prof. F. G. Donnan, F.R.S.

V. “ The Significance of the Electrode Potential.” By J. H eyrovsky. Communicated by Prof. F. G. Donnan, F.R.S. VI. “ On the Quantum Theory of the Simple Zeeman Effect.” By A. M. Mosharrafa. Communicated by Prof. 0. W. Richardson, F.R.S. VII. “ Discontinuous Fluid Motion past Circular and Elliptic Cylinders.” By S. Brodetsky. Communicated by Prof. G. H. Bryan, F.R.S. The Society adjourned over the Christmas Recess to January 18, 1923.

January 18, 1923. Sir CHARLES SHERRINGTON, President, in the Chair. In pursuance of the Statutes the names of the Candidates proposed for election into the Society were read as follows:— Abell, Sir Westcott Stile. Davidson, Charles Rundle. Adrian, Edgar Douglas. Denny, Sir Archibald. Allen, Herbert Stanley. Desch, Cecil H. Arkwright, Joseph Arthur. Dreyer, John L. E. Ashley, Sir William. Duerden, James Edwin. Atkins, William Ringrose Gelston. Edgeworth, Francis Henry. Balfour, Andrew. Edridge-Green, Frederick William. Balfour, Henry. Eltringham, Harry. Balls, William Laurence. Evans, C. Lovatt. Barnard, Joseph Edwin. Fawcett, Edward. Barr, Archibald. Flack, Martin William. Beattie, James Martin. Fleming, Alexander. Bedson, Peter Phillips. Francis, Francis Ernest. Bond, Charles John. Freeth, Francis Arthur. Borradaile, Lancelot Alexander. Gardner, John Addyman. Brown, Thomas Graham. Gemmill, James Fairlie. Browning, Carl Hamilton. Gibson, Walcot. Bur}', Henry. Goodwin, Sir George Goodwin. Cheeseman, Thomas F. Gordon, Mervyn Henry. Christophers, Samuel Rickard. Griffiths, Ezer. Groom, Percy. Milroy, Thomas Hugh Gunn, James Andrew. Moir, James Reid. Harmer, Frederic William. Mordell, Louis Joel. Hartley, Harold. Mummery, J. Howard. Henderson, Sir James B. Newton, Richard Bullen. Herring, Percy Theodore. Oxley, Arthur Ernest. Hill, Thomas George. Patterson, Thomas Stewart. Hilton, Harold. Pidduck, Frederick Bernard. Horton, Frank. Plaskett, John Stanley. Houston, Alexander Cruikshank. Plimmer, Robert Henry Aders. Howe, George William O. Price, Thomas Slater. Hunter, James de Graaff. Procter, Henry Richardson. Hurst, Harold Edwin. Raman, Chandrashekara Y. Imms, Augustus Daniel. Richardson, Lewis Fry. Jeffrey, Edward Charles. . Ritchie, James. Jeffreys, Harold. Rogers, Leonard Janies. Jehu, Thomas John. Russell, Alexander. Jenkin, Charles Frewen. Schryver, Samuel Barnett. Johnstone, James. Shaw, Philip Egerton. Jones, Frederic Wood. Silberrad, Oswald. Jones, Owen Thomas. Simonsen, John Lionel. Kendal], Percy Fry. Skeats, Ernest Willington. King, Louis Y. Smith, George Frederick H. Lake, Philip. Smith, Henry George. Lang, William Dickson. Smith, Sir William Edward. Leiper, Robert Thomson. Spearman, Charles. Lewis, William C. McCullagh. Spencer, Leonard James. Lowe, Percy Roycroft. Stopford, John Sebastian Bach, McBain, James William. Tillyard, Robin John. McCarrison, Robert. Troup, Robert Scott. MacLeod, John J. Rickard. Walker, Ernest William A. Mallik, Devendra Nath. Wenyon, Charles Morley. Marshall, Guy Anstruther Knox. Werner, Emil Alphonse. Maw, William Henry. Wheeler, Richard Yernon, Mawson, Sir Douglas. Whiddington, Richard. Meakins, Jonathan Campbell. Wilson, Ernest. Mellanby, Edward. Wilson, William. Mills, William Hobson. Wolf, Charles G. L.

The following Papers were read

L “ Observations on the Effect of High Altitude on the Physiological Processes of the Human Body. (Report to the Peru High- Altitude Committee.)” By J. Barcroft, F.R.S., and others. H. “ Remarks on the Inheritance of Acquired Characters.” (Verbal communication only.) By Prof. E. W. MacBride, F.R.S. HI. “ Baluchitherium (? osborni syn. turgaicum, Borris- syak).” By C. F. Coopf.r. Communicated by Dr. A. S. Woodward, F.R.S. IV. “ The Sympathetic Innervation of the Vagina.” By J. A. Gunn and K. J. F ranklin. Communicated by Sir Charles Sherrington, P.R.S. V. “ On the Metabolic Gradient of the Frog’s Egg.” By H. G. Cannon. Communicated by Prof. E. W. MaoBride, F.R.S. VI. “ On the Relation between Permeability Variation and Plant Movements.” By Mr. Basiswar Sen. Communicated by Sir W illiam Bayliss, F.R.S. VII. “ An Inquiry into an Outbreak of Human Trypanosomiasis in a ‘ Glossinamorsitans ’ Belt to the East of Mwanza, Tanganyika Territory.” By H. L. Duke, M.D. Communicated by Mr. C. Dobell, F.R.S. VIII. “ Le Centenaire des Iguanodons (1822-1922).” By M. Louis Dollo, Sc.D. Communicated by Prof. A. C. Seward, F.R.S.

January 25, 1923.

Sir CHARLES SHERRINGTON, President, in the Chair.

The following Papers were read:— I. “ The Potential Difference occurring in a Donnan Equilibrium and the Theory of Colloidal Behaviour.” By Prof. A. V. H ill, F.R.S. II. “ A Study of Catalytic Actions at Solid Surfaces. X.—The Interaction of Carbon Monoxide and Hydrogen as condi­ tioned by Nickel at relatively Low Temperatures.—A Prac­ tical Synthesis of Methane.” By E. F. Armstrong, F.R.S., and T. P. Hilditch. III. “ The Periodic Opacity of certain Colloids in progressively increasing Concentrations of Electrolytes.” By J. Holker, D.Sc. Communicated by Prof. A. V. Hill, F.R.S. IV. “ The Photochemistry of Potassium Permanganate. Part I.— Ihe Application of the Potentiometer to the Study of Photochemical Change. Part II.—On the Energetics of the Photo-decomposition of Potassium Permanganate.” By E. K. Rideal and R. G. W. Norrish. Communicated by Sir W illiam P ope, F.R.S. V. “ Some Moisture Relations of Colloids. I.—A Comparative Study of the Rates of Evaporation of Water from Wool, Sand, and Clay.” By E. A. F isher. Communicated by Prof. A. Smithells, F.R.S. VI. “ Smokes. Part I.—A Study of their Behaviour and a Method of Determining the Number of Particles they contain.” By R. Whytlaw-Gray, J. B. Spearman, and J. H. P. Campbell. Communicated by Prof. A. Smithells, F.R.S. VII. “ Smokes. Part II.—A Method of Determining the Size of the Particles in Smokes.” By R. W hytlaw-Gray and J. B. Spearman. Communicated by Prof. A. Smithells, F.R.S. VIII. “ The Effect of Long Grinding on Quartz (Silver Sand).” By R. C. Ray. Communicated by Dr. M. W. Travers, F.R.S. VI. “ Smokes. Part L—A Study of their Behaviour and a Method of Determining the Number of Particles they contain.” By R. Whytlaw-Gray, J. B. Spearman, and J. H. P. Campbell. Communicated by Prof. A. Smithells, F.R.S. VII. “ Smokes. Part II.—A Method of Determining the Size of the Particles in Smokes.” By R. Whytlaw-Gray and J. B. Spearman. Communicated by Prof. A. Smithells, F.R.S. VIII. “ The Effect of Long Grinding on Quartz (Silver Sand).” By R. C. Ray. Communicated by Dr. M. W. Travers, F.R.S.

February 1, 1923. Sir CHARLES SHERRINGTON, President, in the Chair. The following Papers were read :— I. “ The Magnitude of the Gyro-magnetic Ratio.” By Prof. 0. W. Richardson, F.R.S. II. “ The Production of Artificial Vowel Sounds.” By Sir Richard Paget, Bart. Communicated by Sir W illiam Bragg, F.R.S. III. “ The Carbon Arc Spectrum in the Extreme Ultra-violet.” By F, Simeon. Communicated by Prof. A. W. P orter, F.R.S. IV. “ Pleochroic Haloes of Various Geological Ages.” By Prof. J. J oly, F.R.S. V. “ The Motion of Electrons in Gases.” By Prof. H. A. W ilson, F.R.S. VI. “ The Coincidence Method for the Wave-length Measurement of Absorption Bands.” By H. Hartridge. Communicated by Prof. J. N. Langley, F.R.S. VII. “ On the Steady Motion of a Cylinder through Infinite Viscous Fluid.” By A. Berry and Lorna M. Swain. Communicated by H. W. Richmond, F.R.S. VIII. “ The Line Spectrum of Chlorine in the Ultra-violet Region (A 3354-2070 A).” By W. J evons. Communicated by Prof. H. C. P lummer, F.R.S. IX. “ Note on the Adsorption of Gases by Solids and the Thickness of the Adsorbed Layer.” By M. H. Evans and H. J. George. Communicated by D. L. Chapman, F.R.S. February 8, 1923. Sir CHARLES SHERRINGTON, President, in the Chair. The following Papers were read:— I. “ The Resistance of a Cylinder moving in a Viscous Fluid.” By Prof. L. Bairstow, F.R.S., Miss B. M. Cave, and Miss E. D. Lang. II. “ The Motion of Ellipsoidal Particles in a Viscous Fluid.” By G. I. Taylor, F.R.S. III. “ Further Researches on the Strength of Materials.” By Prof. W. E. Dalby, F.R.S. IV. “ Theory of the Measurement of Wind by Shooting Spheres Upward.” By Lewis F. Richardson. Communicated by Dr. G. C. Simpson, F.R.S. V. “ On the Susceptibility of Feebly Magnetic Bodies as affected by Tension.” By Ernest W ilson. Communicated by Prof. 0. W. Richardson, F.R.S. VI. “ Investigations on the Paramagnetic Sulphates at Low Tempera­ tures.” By L. C. J ackson and Prof. H. Kamerlingh Onnes, For. Mem. R.S. VII. “ Investigations on the Paramagnetism of Crystals at Low Temperatures.” By L. C. J ackson and Prof. H. Kamerlingh Onnes, For. Mem. R.S. VIII. “ The Specific Heats of Air, Steam, and Carbon Dioxide.” By W. D. W omersley. Communicated by Sir Dugald Clerk, F.R.S. IX. “ The Valve-maintained Tuning Fork as a Precision Time Standard.” By D. W. Dye. Communicated by Sir J oseph Petavel, F.R.S.

February15, 1923. Sir CHARLES SHERRINGTON, President, in the Chair. The following Papers were read :— I. “ Researches upon the Larch Chermes ( strobilobius, Kalt.), and their Bearing upon the Evolution of the in general.” By E. R. Speyp:r. Communicated by Prof. G. C. Bourne, F.R.S. II. “ The Irradiation of Conditioned Reflexes.” By G. V. Anrep. Communicated by Prof. E. H. Starling, F.R.S. III. “ The Oxidation of Reduced Glutathione and other Sulphydryl Compounds.” By M. Dixon and H. E. Tunnicliffe. Com­ municated by Prof. F. G. Hopkins, F.R.S. IV. “ The Variation of Arterial Elasticity with Blood Pressure in Man.” By J. C. Bramwell, R. J. S. MoDowall, and B. A. McSwiney. Communicated by Prof. A. V. Hill, F.R.S. V. “ On the Existence of an Unidentified Sulphur Grouping in the Protein Molecule. Part I.—On the Denaturation of Proteins. Part II.—On the Estimation of Cystine in certain Proteins.” By L. J. Harris. Communicated by Prof. F. G. Hopkins, F.R.S. VI. “ Reflex Contractions of the Cruralis Muscle in the Decerebrate and Spinal Frog. By N. B. Laughton. Communicated by Sir Charles Sherrington, P.R.S.

February 22, 1923. Sir CHARLES SHERRINGTON, President, in the Chair. In pursuance of the Statutes, the names of the Candidates recommended for election into the Society were read from the Chair as follows :— Adrian, E. D. McBain, J. W. Balls, W. L. Macleod, J. J. R. Barr, A. Marshall, G. A. K. Desch, C. H. Mawson, Sir D. Fawcett, E. Mills, W. H. Horton, F. Plaskett, J. S. Leiper, R. T. Procter, H. R. Wilson, W.

The Bakerian Lecture was delivered by G. I. Taylor, F.R.S., and C. F. Elam— “ On the Distortion of an Aluminium Crystal during a Tensile Test.”