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MINUTER OF MEETINGS OP THE ROYAL SOCIETY.

November 4, 1926. Sir ERNEST , O.M., President, in the Chair. The following papers were read :— I. “ Experiments on the Production of Large Copper Crystals.” By H. C. H. Carpenter, F.R.S., and S. Tamura. II. “ The Formation of Twinned Metallic Crystals.” By H. C. H. Carpenter, F.R.S., and S. Tamura. III. “ The Distortion of Iron Crystals.” By G. I. Taylor, F.R.S., and C. F. Elam. IV. “ The Metallography of Solid Mercury and Amalgams.” By W. Rosenhain, F.R.S., and A. J. Murphy. V. “ Tensile Tests of Large Gold, Silver and Copper Crystals.” By C. F. Elam. Communicated by H. C. H. Carpenter, F.R.S. VI. “ The Polymorphism of Silicon Dioxide and the Structure of Tridymite.” By R. E. Gibbs. Communicated by Sir William Bragg, F.R.S. VII. “ A Method of Studying the Behaviour of X-Ray Tubes. By R. C. Richards. Communicated by A. W. Porter, F.R.S. VIII. “ Change of Crystal Habit of some Salts when Crystallised from Silicic Acid Gel.” By H. A. Fells and J . B. Firth. Communicated by F. S. Kipping, F.R.S. IX. “ The Effect of Temperature on the Viscosity of Air.” By F. A. Williams. Communicated by H. B. Dixon, F.R.S. X. “ The Number of Particles in (3-Ray Spectra.—II. By R. W. Gurney. Communicated by Sir E rnest Ruther­ ford, Pres. R.S. XI. “ On the Excitation of Polarised by Impact.” By H. W. B. Skinner. Communicated by Sir , Pres. R.S. XII. “ The Mechanism of Activation at Catalytic Surfaces.” By H. S. Taylor. Communicated by E. F. Armstrong, F.R.S. XIII. “ Experiments upon the Reported Transmutation oi Mercury into Gold.” By M. W. Garrett. Communi­ cated by F. A. Lindemann, F.R.S. [ ii ]

XIV. “ Crystal Structure and Chemical Constitution of Basic Beryllium Acetate and its Homologues.” By G. T. Morgan, F.R.S., and W. T. Astbury. XV. “ The Structure and Isotri morphism of the Tor valent Metallic Acetylacetones.” By W. T. Astbury (with Addendum by G. T. Morgan, F.R.S.). Communicated by Sir William Bragg, F.R.S. XVI. “ The Crystal Structure of Meteoric Iron as determined by X-Ray Analysis.” By J. Young. Communicated by S. W. J. Smith, F.R.S. XVII. “ On the Interpretation of X-Ray, S: ugie-Crystal, Rotation Photographs.” By J. D. Ber> o,. Communicated by Sir William Bragg, F.R.S. XVIII. “ On the Total Photo-Electri Emission of from Metals as a Function of to£ Exciting .” By S. C. Roy. Communicated bv 0. W. Richardson, F.R.S. XIX. “ An Apparently Unimolecular Reaction—The Homo­ geneous Decomposition of Gaseous Propionic Aldehyde.” By C. N. Hinshelwood and H. W. Thompson. Com­ municated by N. V. Sedgwick, F.R.S. XX. “ Note on the Theory of Cuimolecular Reactions.” By C. N. Hinshelwood. Communicated by N. V. Sidgwick, F.R.S. XXI. “ Bands in the Ultra-Violet Lyman Region.” By S. Werner. Communicated by N. Bohr, For. Mem. R.S. XXIT. “ The Initial Stages of the Dehydrogenation and Isomeric Change of Allyl Alcohol.’' By F. H. Constable. Com­ municated by T. M. Lowry, F.R.S. XXIII. “ The Longitudinal Magi.qto-Resistance Effect in Single Crystals of Iron.” By Yy. L. Webster. Communicated by Sir E rnest Ruthfb ’ord, Pres. R.S. XXIV. “The of Cathode Rays.” By B. F. J. Schonland. Communicated by Sir Ernest Ruther­ ford, Pres. R.S. XXV. “ On the Theory of Mechanics.” By P. A. J\L Dirac. Communicated by R. H. F owler, F.R.S. XXVI. “ Magnetic Double Refraction in Liquids.—I.” By C. V. Raman, F.R.S., and K. S. Krishnan. [ iii ]

XXVII. The Properties of Torsional Vibrations in Reciprocating Engine Shafts.—Parts I and II.” By G. R. Golds- broijgh and H. Baker. Communicated by T. H. Havelock, F.R.S. XXVIII. The Distribution of Normal Pressures on a Prolate Spheroid.” By R. J ones. Communicated by H. Lamb, F.R.S. XXIX. I he Band Spectrum of and Hydrogen at Low Temperatures.” By J. C. McLennan, F.R.S., H. G. Smith and C. A. Lea. XXX. The Scattering of Light by the Individual Particles in Smokes.” By H. S. Patterson and R. W. Gray. Communicated by N. V. Sidgwick, F.R.S. XXXI. On the Densities of Ultra-Microscopic Particles.” By H. S. Patterson and R. W. Gray. Communicated by N. V. Sidgwick, F.R.S. XXXII. Theorems concerning Mean Values of Analytic Func­ tions.” By G. H. Hardy, F.R.S., A. E. Ingham and G. Polya.

November 11, 1926. (Joint Meeting with the Royal Astronomical Society.) Sir ERNEST RUTHERFORD, O.M., President, in the Chair. A discussion of the “ Results obtained at the Solar Eclipse of January 14, 1926,” was opened by Sir Frank Dyson, F.R.S. Mr. C. R. Davidson, Mr. F. J. M. Stratton, Prof. Ornstein, Dr. Minnaert and a number of Fellows of the Royal Society and of the Royal Astronomical Society also spoke. , II. The Astronomer Royal communicated drawings of “ The Solar Corona at the Eclipses from 1896 to 1922,” with descriptions.

November 18, 1926. Sir ERNEST RUTHERFORD, O.M., President, in the Chair. Sir Douglas Mawson was admitted into the Society. I. “ Reports from the Royal Society’s Kala Azar Commission in China.” By \V. S. Patton and E. Hindle. Communicated by H. H. Dale, Sec. R.S. II. “ The Chemical Nature of Hamiochromogen and its Carbon Monoxide Compound.” By R. Hill. Communicated by Sir Frederick Hopkins, F.R.S. [ IV ]

HI. “ The Excretion of Uric Acid by the Kidney.” By H. Gremels and R. Bodo. Communicated by E. H. Starling, F.R.S. IV. “ The Antiseptic Properties of the Amino-Derivatives of Styryl and Anil Quinoline.” By C. H. Browning, J. B. Cohen, F.R.S., S. E llingworth and R. Gulbransen. V. “ The Effects of X-Rays upon Mitotic Cell Division in Tissue Cultures in vitro.'” By T. S. P. Strangeways and F. L. H opwood. Communicated by Sir William H ardy, F.R.S. VI. “ Observations on Concurrent Contraction of Flexor Muscles in the Flexion Reflex.” By Sir Charles Sherrington, O.M., F.R.S., and R. S. Creed. VII. “ The Isolation of some hitherto Undescribed Products of Hydrolysis of Proteins.—Part III.” By S. B. Schryver and H. W. Buston. Communicated by V. H. Blackman, F.R.S. VIII. “ The Action of X-Rays on colpoda.” By J. A. Crowther. Communicated by Sir William H ardy, F.R.S.

November 30, 1926.

Anniversary Meeting. Sir ERNEST RUTHERFORD, O.M., 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 Lists of Fellows deceased and of Fellows and Foreign Members 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 Charles Close, seconded by Sir Charles Sherrington, 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 Frederick Hopkins. The ...... ,, Sir . A Royal Medal ...... ,, Sir William Hardy. A Royal Medal ...... „ Prof. A. V. Hill. The Darwin M edal...... ,, Dr. D. H. Scott. The Davy Medal ...... ,, Sir James Walker. The Hughes Medal ...... ,, Admiral of the Fleet Sir Henry Jackson. [ V ]

The President having, with the consent of the Society, nominated Sir Thomas Heath and Prof. A. Harden 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 preceding meeting had been duly elected, as under :— President.—Sir Ernest Rutherford, O.M., M.A., D.Sc. Treasurer.—Sir David Prain, C.M.G., C.I.E., M.A., LL.D. Sietvrtar'ei— J Mr- James Hopwood Jeans, M.A., D.Sc., LL.D. ' \D r . , C.B.E., M.A. Foreign Secretary.—Sir Richard Tetley Glazebrook, K.C.B., M.A. Sc.D. Other Members of the Council.—Sir Hugh Kerr Anderson, M.A., M.D.; Dr. , M.A. ; Prof. Leonard Bairstow, C.B.E.; Prof. Frederick Orpen Bower, Sc.D.; Sir Archibald Edward Garrod, K.C.M.G., M.A., D.M.; Prof. Edmund Johnston Garwood, M.A., Sc.D.; Sir Thomas Little Heath, K.C.B., K.C.Y.O., Sc.D.; Prof James Peter Hill, D.Sc. ; Dr. Peter Chalmers Mitchell, C.B.E., M.A. ; Prof. Robert Muir, M.A., M.D. ; Sir John Herbert Parsons, C.B.E., D.Sc.; Sir Robert Robertson, K.B.E., M.A., D.Sc.; Mr. Alan Archibald Campbell Swinton ; Sir Gilbert Thomas Walker, C.S.I., M.A., Sc.D.; Sir James Walker, D.Sc., LL.D. ; Mr. William Cecil Dampier Whetham, M.A.

December 2, 1926.

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 Archibald Garrod. Sir Richard Glazebrook. Sir David Prain. Mr. Dampier Whetham.

The following papers were read :— I. “ Optical Rotary Dispersion.—Part TIL The Rotatory Dis­ persion of Quartz in the Infra-Red, Visible and Ultra-Violet Regions.” By T. M. Lowry, F.R.S., and W. R. C. Coode- Adams. II. “ Structure in the Secondary Hydrogen Spectrum.—V.” By 0. W. Richardson, F.R.S. [ vi ]

III. “ General Forms of Statistical Mechanics, with Special Reference to the New .” By R. H. F owler, F.R.S. IV. “ On the Rate of Maximum Activation by Collision for the Complex Molecules, with Applications to Velocities of Gas Particles.” By R. H. F owler, F.R.S., and E. K. Rideal. V. “ The Spectrum of Fluorine (FI).” By H. Dingle. Com­ municated by A. F owler, F.R.S. VI. “ Integrals of the Equations of Electrodynamics, with an Application to the Electric Constants of a Transparent Medium.” By H. M. Macdonald, F.R.S. VII. “ The Forces on a Cylinder in a Stream of Viscous Fluid.” By L. N. G. F ilon, F.R.S. VIII. “ The Structure and Origin of the Swan Band Spectrum of Carbon.” By R. C. J ohnson. Communicated by T. R. Merton, F.R.S.

IX. “ Studies upon Catalytic Combustion.—III.” By W. A. Bone, F.R.S. X. “ Absorption Spectra of Pyrone Derivatives in the Near Infra- Red.” By A. Ross. Communicated by J. N. Collie , F.R.S. XI. “ An Analysis of the Electromagnetic Field into Moving Elements.” By S. R. Milner, F.R.S.

XII. “ The Structure of y-Brass.” By A. J. Bradley and J. Thewlis. Communicated by W. L. Bragg, F.R.S. XIII. “ The Secondary and Tertiary Cathode Rays produced by External and Internal Absorption of Homogeneous X-Rays.” By H. R. R obinson and A. M. Cassie. Communicated by C. G. Barkla, F.R.S. XTV. “ The Vapour Pressure and Melting Points of Sodium and Potassium.” By W. E dmondson and A. Egerton, F.R.S. XV. “ The Chemical and other Thermal Constants of Sodium and Potassium.” By W. E dmondson and A. E gerton, F.R.S. XVI. “ The Thermal Conductivity of Vitreous Silica, with a Note on Crystalline Quartz.” By G. W. C. Kaye and W. F. H iggins. Communicated by Sir J oseph P etavel, F.R.S. XVII. “ On Hilbert’s World-Function.” By E. T. Whittaker, F.R.S. [ vii ]

XVIII. “ Supplementary Tables of Wave-lengths of New Lines in the Secondary Spectrum of Hydrogen.” By D. B. Deodhar. Communicated by 0. W. Richardson, F.R.S. XIX. “ On Wireless Interference Phenomena between Ground Waves and Waves deviated by the Upper Atmosphere.” By E. V. Appleton and M. A. F. Barnett. Communicated by Admiral Sir Henry J ackson, F.R.S. XX. “ An X-Ray Study of Isomorphism in Simple Organo-Metallic Series. Part I.—The Tetraphenyls.” By W. H. George. Communicated by Sir William Bragg, F.R.S. XXI. “ Conduction of Heat through Powders and its Dependence on the Pressure and Conductivity of the Gaseous Phase.” By J. Aberdeen and T. H. Laby. Communicated by H. L. Callendar, F.R.S. XXII. “ The Equilibrium of Heterogeneous Systems, including Elec­ trolytes. Part II.—Equilibrium at Interfaces and the Theory of Electrocapillarity.” By J. A. V. Butler. Communicated by F. G. Donnan, F.R.S.

XXIII. “ A Further Note upon ‘ Inter-traction.' By N. K. Adam. Communicated by Sir William Hardy, F.R.S. XV

INDEX t o VOL. CXIII. (A) Aberdeen (J.) and Laby (T. H.) Conduction of Heat through Powders and its Dependence on the Pressure and Conductivity of the Gaseous Phase, 459. Absorption spectra of nitrates in the region 300/zy (Morton and Riding), 717. Absorptive power, measurement of (Baly, Morton and Riding), 709. Activation at catalytic surfaces, mechanism of (Taylor), 77. Activation by collision for complex molecules (Fowler and Rideal), 570. Adam (N. K.) A Further Note on Intertraction, 478. Adhesives, true chemical compounds as (McBain and Lee), 606. Allyl alcohol dehydrogenation and isomeric change (Constable), 254. Analytic functions, mean values of (Hardy, Ingham and Polya), 542. Appleton (E. V.) and Barnett (M. A. F.) On Wireless Interference Phenomena between Ground Waves and Waves deviated by the Upper Atmosphere, 450. Ayrton (Mrs. H.) Primary and Secondary Vortices in Oscillating Fluids, 44. Baker (H.) See Goldsbrough and Baker. Baly (E. C. C.), Morton (R. A.) and Riding (R. W.) The Measurement of Absorptive Power, 709. Barnett (M. A. F.) See Appleton and Barnett. Benzene, magnetic double refraction in (Raman and Krishnan), 511. Bernal (J. D.) On the Interpretation of X-Ray, Single Crystal, Rotation Photographs, 117. Bottomley (J. T.) Obituary notice, xii. Bragg (W. L.) The Structure of Phenacite, Be2Si04, 642. Butler (J. A. V.) The Equilibrium of Heterogeneous Systems, including Electrolytes. II—Equilibrium at Interfaces and the Theory of Electrocapillarity, 594. Carpenter (H. C. H.) and Tamura (S.) Experiments on the Production of Large Copper Crystals, 28 ; The Formation of Twinned Metallic Crystals, 161. Cassie (A. M.) See Robinson and Cassie. Cathode rays, scattering of (Schonland), 87. Cathode rays, secondary and tertiary, produced by absorption of homogeneous X-rays (Robinson and Cassie), 282. Chapman (S.) See Topping and Chapman. Collision, maximum activation by, for complex molecules (Fowler and Rideal), 570. Conduction of heat through powders (Aberdeen and Laby), 459. Constable (F. H.) The Initial Stages of the Dehydrogenation and Isomeric Change of Allyl Alcohol, 254. Copper crystals, large, production of (Carpenter and Tamura), 28. Crystal, single, interpretation of X-ray rotation photographs (Bernal), 117. Crystal structure of phenacite (Bragg), 642. Crystal structure of silicon dioxide (Gibbs), 351. Crystalline sodium nitrate, form and energy of (Topping and Chapman), 658. Crystals, carbonate, theoretical determinations of structure of (Lennard-Jones and Dent), 673. Crystals, large copper, production (Carpenter and Tamura), 28. Crystals, single, of iron, longitudinal magneto-resistance effect (Webster), 196. Crystals, twinned metallic, formation (Carpenter and Tamura), 161. Dent (B. M.) See Lennard-Jones and Dent, VOL, CXIII.— A, C XVI

Deodhar (D. B.) Supplementary Table of Wave-Lengths of New Lines in the Secondary Spectrum of Hydrogen, 420. Dingle (H.) The Spectrum of Fluorine (FI), 323. Dirac (P. A. M.) The Physical Interpretation of the Quantum Dynamics, 621. Edmondson (W.) and Egerton (A.) The Vapour Pressures and Melting Points of Sodium and Potassium, 520 ; The Chemical and other Thermal Constants of Sodium and Potassium, 533. Egerton (A.) See Edmondson and Egerton. Electrocapillarity, theory of (Butler), 594. Electrodynamics, integrals of equations of (Macdonald), 237. Filon (L. N. G.) The Forces on a Cylinder in a Stream of Viscous Fluid, 7. Fluorine, spectrum of (Dingle), 323. Forces on a cylinder in a stream of viscous fluid (Filon), 7. Fowler (R. H.) General Forms of Statistical Mechanics with Special Reference to the Requirements of the New Quantum Mechanics, 432. Fowler (R. H.) and Rideal (E. K.) On the Rate of Maximum Activation by Collision for Complex Molecules with Applications to Velocities of Gas Reactions, 570. George (W. H.) An X-ray Study of Isomorphism in Simple Organo-Metallic Series. I— The Tetraphenyls, 585. Goldsbrough (G. R.) and Baker (H.) The Properties of Torsional Vibrations in Recipro­ cating Engine Shafts. Part I, 259. Part II, 272. Gibbs (R. E.) The Polymorphism of Silicon Dioxide, and the Structure of Tridymite, 351. Grace (S. F.) On the Motion of a Sphere in a Rotating Liquid, 46. Hardy (G. H.), Ingham (A. E.) and Polya (G.) Mean Values of Analytic Functions, 542. Helium and hydrogen, band spectra at low temperatures (McLennan. Smith and Lea), 183. Heterogeneous systems including electrolytes, II (Butler), 594. Higgins (W. F.) See Kaye and Higgins. Hilbert’s world-function (Whittaker), 496. Hinshelwood (C. N.) On the Theory of Unimolecular Reactions, 230. Hinshelwocd (C. N.) and Thompson (H. W.) An Apparently Unimolecular Reaction— The Homogeneous Decomposition of Gaseous Propionic Aldehyde, 221. Hydrogen-and helium, band spectra at low temperatures (McLennan, Smith and Lea), 183. Hydrogen bands in the ultra-violet Lyman region (Werner), 107. Hydrogen, secondary spectrum—V. (Richardson), 368. Hydrogen, secondary spectrum, table of new lines (Deodhar), 420. Ingham (A. E.) See Hardy, Ingham and Polya. Integrals of the equations of electrodynamics (Macdonald), 237. Interfaces, equilibrium of heterogeneous systems including electrolytes at (Butler), 594. Intertraction, a further note (Adam), 478. Isomorphism in tetraphenyls, X-ray study of (George), 585. Kaye (G. W. C.) and Higgins (W. F.) The Thermal Conductivity of Vitreous Silica, with a Note on Crystalline Quartz, 335. Krishnan (K. S.) See Raman and Krishnan. Laby (T. II.) See Aberdeen and Laby. Lea (C. A.) See McLennan, Smith and Lea. Lee (W. B.) See McBain and Lee. Lennard-Jones (J. E.) and Dent (B. M.) Some Theoretical Determinations of the Structure of Carbonate Crystals, I, 673. II, 690, XVI1

Longitudinal magneto-resistance effect in single crystals of iron (Webster), 100. McBain (J. W.) and Lee (W. B.) Adhesives and Adhesion : True Chemical Compounds as Adhesives, 606. Macdonald (H. M.) Integrals of the Equations of Electrodynamics with an Application to the Electric Constants of a Transparent Medium, 237. McLennan (,T. C.), Smith (H. G.) and Lea (C. A.) The Band Spectra of Hydrogen and Helium at Low Temperatures, 183. Magnetic double refraction in liquids—I (Raman and Krislinan), oil. Mass and weight, proportionality of (Potter), 731. Mean values of analytic functions (Hardy, Ingham and Polya, 542. Mercury, solid, metallography of (Rosenhain and Murphy), 1. Merton (T. R.) On Measurement of the Intensity of Spectrum Lines, 697; On Tempera­ ture and Pressure Regulation in Prismatic Spectrographs, 704. Metallography of solid mercury and amalgams (Rosenhain and Murphy), 1. Morton (R. A.) See also Baly, Morton and Riding. Morton (R. A.) and Riding (R. W.) Absorption Spectra of Nitrates in the Region 300^. 717. Motion of a sphere in rotating liquid (Grace), 46. Murphy (A. J.) See Rosenhain and Murphy. Nitrates, absorption spectra (Morton and Riding), 717. Obituary Notices of Fellows Deceased : — Bottomley (J. T.), xii. Onnes (H. K.), i. Watts (Sir Philip), vi. Onnes (H. K.) Obituary notice, i. Patterson (H. S.) and Whytlaw-Gray (R.) On the Densities of Particles in Smokes, 302 ; The Scattering of Light by the Individual Particles in Smokes, 312. Phenacite, Structure of ( Bragg), 642. Polya (G.) See Hardy, Ingham and Polya. Potassium and sodium, chemical constants (Edmondson and Egerton), 533. Potassium and sodium, vapour pressures (Edmondson and Egerton), 520. Potter (H. IT.) On the Proportionality of Mass and Weight, 731. Presidential address at anniversary meeting, 481. Pyrone derivatives, absorption spectra in the near infra-red (Ross). 208. Quantum dynamics, physical interpretation of (Dirac), 621. Quantum mechanics, general forms of statistical mechanics (Fowler), 432. Quartz, crystalline, note on (Kaye and Higgins), 335. Raman (C. V.) and Krishnan (K. S.) Magnetic Double Refraction in Liquids. I.—Benzene and Its Derivatives, 511. Richardson (O. W.) Structure in the Secondary Hydrogen Spectrum—V, 368. Rideal (E. K.) See Fowler and Rideal. Riding (R. W.) See Baly, Morton and Riding, and Morton and Riding. Robinson (H. R.) and Cassie (A. M.) The Secondary and Tertiary Cathode Rays produced by External and Internal Absorption of Homogeneous X-Rays, 282. Rosenhain (W.) and Murphy (A. J.) The Metallography of Solid Mercury and Amalgams, 1, Ross (A.) Absorption Spectra of Pyrone Derivatives ih the Near Infra-Red, 208, Rotating liquid, motion of sphere in (Grace), 46. Rutherford (Sir Ernest) Anniversary Address, 1926, 481, Scattering of cathode rays (Schonland), 87. Schonland (B. F. J.) The Scattering of Cathode Rays, 87. Silica, vitreous, thermal conductivity of (Kaye and Higgins), 335. Silicon dioxide, polymorphism of (Gibbs), 351. Smith (H. G.) See McLennan, Smith and Lea. Smokes, densities of particles in (Patterson and Whytlaw-Gray), 302. Smokes, scattering of light by particles in (Patterson and Whytlaw-Gray), 312. Sodium and potassium, chemical constants (Edmondson and Egerton), 533. Sodium and potassium, vapour pressures and melting points ( Edmondson and Egerton), 520. Spectra, absorption, of nitrates in the region 300 p/x (Morton and Riding), 717. Spectra, absorption, of pyrone derivatives in the near infra-red (Ross), 208. Spectrographs, prismatic, temperature and pressure regulation in (Merton), 704. Spectrum. See also Hydrogen. Spectrum lines, measurement of the intensity of (Merton). 697. Spectrum of fluorine (Dingle). 323. Statistical mechanics, general forms of (Fowler), 432. Tamura (S.) See Carpenter and Tamura. Taylor (H. S.) The Mechanism of Activation at Catalytic Surfaces, 77. Temperature, effect on viscosity of air (Williams), 233. Tetraphenyls, X-ray study of isomorphism in (George), 585. Thompson (H. W.) SeeHinshelwood and Thompson. Topping (J.) and Chapman (S.) On the Form and Energy of Crystalline Sodium Nitrate, 658. Torsional vibrations in reciprocating engine shafts (Goldsbrough and Baker). 259, 272. Tridymite, structure of (Gibbs), 351. Twinned metallic crystals, formation of (Carpenter and Tamura), 161. Ultra-violet region, hydrogen bands in (Werner), 107. Unimolecular reaction, decomposition of propionic aldehyde (Hinshelwood and Thompson), 221. Unimolecular reactions, theory of (Hinshelwood), 230. Upper atmosphere, waves deviated by, interference phenomena (Appleton and Barnett, 450). Viscosity of air, effect of temperature on (Williams), 233. Viscous fluid, forces on cylinder in stream of (Filon), 7. Vortices, primary and secondary in oscillating fluids (Ayrton), 44. Watts (Sir Philip) Obituary notice, vi. Webster (W. L.) The Longitudinal Magneto-Resistance Effect in Single Crystals of Iron, 196. Weight and mass, proportionality of (Potter), 731. Werner (S.) Hydrogen Bands in the Ultra-Violet Lyman Region, 107. Whittaker (E. T.) On Hilbert’s World-Function, 496. Whytlaw-Gray (R.) See Patterson and Whytlaw-Gray. Williams (F. A.) The Effect of Temperature on the Viscosity of Air, 233. Wireless interference phenomena (Appleton and Barnett), 450. World-function, Hilbert’s (Whittaker), 496. X-Ray, single crystal, rotation photographs, interpretation of (Bernal), 117. X-Ray study of isomorphism. I.—Tetraphenyls (George), 585.

end of the one hundred and thirteenth volume (series a).