745

INDEX to VOL. CXIV. (A)

Allen (H. S.) and Sandeman (I.) Bands in the Secondary Spectrum of Hydrogen, 293. Alpha-particles from Radium C (Briggs), 313, 341.Atom, oriented hydrogen, its effective cross section (Fraser), 212.Atoms and ions, many-electron, theoretical prediction of their physical properties (Pauling),

181.Auroral green line (McLennan, McLeod and McQuarrie), 1.

Barnes (H. T.) Some Physical Properties of Icebergs and a Method for their Destruction,161.

Beckett (H. E.) See George and Beckett.Beta-rays, photographic action (Ellis and Wooster), 266.Bismuth and lead, L-emission spectra (Eddy and Turner), 605.Bone (W. A.) and Forshaw (A.) Studies upon Catalytic Combustion, V, 169.Bone (W. A.), Fraser (R. P.) and Winter (D. A.) The Initial Stages of Gaseous Explosions,

I, 402. II, 420.Bone (W. A.), Fraser (R. P.) and Witt (F.) The Initial Stages of Gaseous Explosions,

III, 442.Bragg (W. L.) and West (J.) The Structure of Certain Silicates, 450.Briggs (G. H.) The Straggling of a-Particles from Radium C, 313. The Decrease in

Velocity of a-Particles from Radium C, 341.Buchanan (D.) Periodic Orbits of the Second Genus, 490.Burgers (W. G.) An X-Ray Investigation of Optically Anomalous Crystals of Racemic

Potassium Chlorosulphoacetate, 222.

Carbon dioxide, thermal conductivity (Gregory and Marshall), 354.Catalytic Combustion, V (Bone and Forshaw), 169.Consonants, voiced and unvoiced, their nature and artificial production (Paget), 98. Craib (J.) See Schonland and Craib.Crystals, optical anomalous, of racemic potassium chlorosulphoacetate (Burgers), 222. Cuthbertson (C.) Absorption of Radiation in the Extreme Ultra-Violet by the Inert

Gases, 650 ; On a Relation between the Refractive and Dispersive Constants of the Inert Gases, 659.

Darwin (C. G.) and Watson (W. H.) The Constants of the Magnetic Dispersion of Light,474.

Detonation of gaseous mixtures (Egerton and Gates), 137, 152.Dirac (P. A. M.) The Quantum Theory of the Emission and Absorption of Radiation, 243 ;

The Quantum Theory of Dispersion, 710.Dispersion of light, magnetic, constants (Darwin and Watson), 4 <4.Dispersion, quantum theory (Dirac), 710.Dobson (G. M. B.), Harrison (D. N.) and Lawrence (J.) Measurements of the Amount of

Ozone in the Earth’s Atmosphere, II, 521.Doppler effects in molecular spectrum of hydrogen (Johnson), 697.Doublets, mutual potential energy of a plane network (Topping), 67.

746

Eddy (C. E.) and Turner (A. H.) The L-Emission Spectra of Lead and Bismuth, 605. Egerton (A.) and Gates (S. F.) On Detonation of Gaseous Mixtures of Acetylene and of

Pentane, 137 ; On Detonation in Gaseous Mixtures at High Initial Pressures and Temperatures, 152.

Electromagnetic field, analysis into moving elements (Milner), 23.Electrons, capture by electrified particles (Thomas), 561.Ellis (C. D.) and Wooster (W. A.) The Photographic Action of (3-Rays, 266 ; The Relative

Intensities of the Groups in the Magnetic [3-Ray Spectra of Radium B and C, 276.

Fells (H. A.) and Firth (J. B.) The Phenomena arising from the Addition of Hydrogen Peroxide to the Sol of Silicic Acid, 517.

Films, solid unimolecular, rigidity of (Mouquin and Rideal), 690.Firth (J. B.) See Fells and Firth.Forsdyke (A. G.) See Levy and Forsdyke.Forshaw (A.) See Bone and Forshaw.Foster (J. S.) Stark Patterns observed in Helium, 47.Fowler (A.) and Freeman (L. J.) The Spectrum of Ionised Nitrogen, 662.Fraser (R. G. J.) The Effective Cross Section of the Oriented Hydrogen Atom, 212. Fraser (R. P.) See Bone, Fraser and Winter and Bone, Fraser and Witt.Freeman (L. J.) See Fowler and Freeman.

Garrett (M. W.) Experiments to Test the Possibility of Transmutation by Electronic Bombardment, 289.

Gaseous explosions, initial stages (Bone and others), 402, 420, 442.Gaseous mixtures, detonation (Egerton and Gates), 137, 152.Gates (S. F.) See Egerton and Gates.George (W. H.) and Beckett (H. E.) The Energy of the Struck String, I, 111.Gifford (J. W.) and Lowry (T. M.) The Refractive Indices of Nicotine, 592.Gregory (H.) and Marshall (S.) The Thermal Conductivity of Carbon Dioxide, 354.

Harrison (D. N.) See Dobson, Harrison and Lawrence.Hinshelwood (C. N.) Quasi-Unimolecular Reactions. The Decomposition of Diethyl

Ether in the Gaseous State, 84.Hydrogen, bands in the secondary spectrum (Allen and Sandeman), 293.Hydrogen, connection between visible and ultra-violet bands (Richardson), 643. Hydrogen positive rays, spectrum, Doppler effects and intensities of lines (Johnson), 697.

Icebergs, some physical properties and a method for destruction (Barnes), 161.Inert gases, absorption of radiation in the extreme ultra-violet (Cuthbertson), 650.Inert gases, relation between refractive and dispersive constants (Cuthbertson), 659. Intensity of radiation from a source of electric waves (Macdonald), 367.Intertraction (Wright), 576.Ions and atoms, many-electron, theoretical prediction of their physical properties (Pauling),

181.

Johnson (M. C.) Doppler Effects and Intensities of Lines in the Molecular Spectrum of Hydrogen Positive Rays, 697.

Lawrence (J.) See Dobson, Harrison and Lawrence.Lead and bismuth, L-emission spectra (Eddy and Turner), 605.Levy (H.) and Forsdyke (A. G.) The Stability of an Infinite System of Circular Vortices,

594.

747

Long-Chain compounds, X-ray investigation (Muller), 542.Lowry (T. M.) See Gifford and Lowry.

Macdonald (H. M.) The Intensity of Radiation from a Source of Electric Waves, 367. McLennan (J . C.), McLeod (J. H.) and McQuarrie (W. C.) An Investigation into the Nature

and Occurrence of the Auroral Green Line, 1.McLeod (J. H.) See McLennan, McLeod and McQuarrie.McQuarrie (W. C.) See McLennan, McLeod and McQuarrie.Magnetic dispersion of light (Darwin and Watson)), 474.Magnetic field, analysis of beams of moving charged particles by (Wooster), 729. Magneto-resistance effect, transverse in single crystals of iron (Webster), 611.Marshall (S.) See Gregory and Marshall.Mercury band-spectrum of long duration (Rayleigh), 620.Milner (S. R.) An Analysis of the Electromagnetic Field into Moving Elements, 23. Mouquin (H.) and Rideal (E. K.) The Rigidity of Solid Unimolecular Films, 690.Muller (A.) An X-Ray Investigation of Certain Long-Chain Compounds, 542.

Newbery (E.) Anodic Overvoltage Measurements with the Cathode Ray Oscillograph, 103. Nicotine, refractive indices (Gifford and Lowry), 592.Nitrogen, ionised, spectrum (Fowler and Freeman), 662.

Orbits, periodic, of the second genus (Buchanan), 490.Overvoltage measurements with oscillograph (Newbery), 103.Ozone in the Earth’s Atmosphere (Dobson, Harrison and Lawrence), 521.

Paget (Sir Richard) The Nature and Artificial Production of the (so-called) Voiced and Unvoiced Consonants, 98.

Pauling (L.) The Theoretical Prediction of the Physical Properties of Many-Electron Atoms and Ions. Mole Refraction, Diamagnetic Susceptibility and Extension in Space, 181.

Quantum theory of dispersion (Dirac), 710.Quantum theory of the emission and absorption of radiation (Dirac), 243.Quasi-unimolecular reactions (Hinshelwood), 84.

Radiation from a source of electric waves (Macdonald), 367.Radiation, quantum theory of emission and absorption (Dirac), 24,5.Radium B and C, relative intensities of the groups in the magnetic (3-ray spectra (Ellis

and Wooster), 276.Radium C, oc-particles from (Briggs), 313, 341.Rayleigh (Lord) Studies on the Mercury Band-Spectrum of Long Duration, 620. Richardson (O. W.) Note on a Connection between the Visible and Ultra-Violet Bands

of Hydrogen, 643.Rideal (E. K.) See Mouquin and Rideal.Sandeman (I.) See Allen and Sandeman.Schonland (B. F. J.) and Craib (J.) The Electric Fields of South African Thunders orms,

229.Silicates, structure (Bragg and West), 450.Silicic acid, addition of H20 2 to the sol (Fells and Firth), 517.Simpson (G. C.) The Mechanism of a Thunderstorm, 376.Sparking potentials of discharge tubes (Taylor), 73.

VOL. CXIV.— A.

748

Spectra, L-emission of lead and bismuth (Eddy and Turner), 605.Spectra of radium, magnetic (3-ray (Ellis and Wooster), 276.Spectra, ultra-violet, of the inert gases (Cuthbertson), 650.Spectrum—auroral green line (McLennan, McLeod and McQuarrie), 1.Spectrum, band, of mercury (Rayleigh), 620.Spectrum of hydrogen, visible and ultra-violet bands (Richardson), 643.Spectrum of ionised nitrogen (Fowler and Freeman), 662.Spectrum, secondary, of hydrogen, bands (Allen and Sandeman), 293.Stark patterns observed in helium (Foster), 47.

Taylor (J.) On the Sparking Potentials of Discharge Tubes containing carefully Purified Electrodes, 73.

Thomas (L. H.) On the Capture of Electrons by Swiftly Moving Electrified Particles, 561. Thunderstorm, mechanism (Simpson), 376.Thunderstorms, electric fields (Schonland and Craib), 229.Topping (J.) On the Mutual Potential Energy of a Plane Network of Doublets, 67. Transmutation by electronic bombardment (Garrett), 289.Turner (A. H.) See Eddy and Turner.

Vortices, circular, stability of an infinite system (Levy and Forsdyke), 594.

Watson (W. H.) See Darwin and Watson.Webster (W. L.) The Transverse Magneto-Resistance Effect in Single Crystals of Iron, 611. West (J.) See Bragg and West.Winter (D. A.) See Bone, Fraser and Winter.Witt (F.) See Bone, Fraser and Witt.Wooster (W. A.) The Analysis of Beams of Moving Charged Particles by a Magnetic

Field, 729.Wooster (W. A.) See also Ellis and Wooster.Wright (Sir Almroth) A further Contribution to the Study of the Phenomena of Inter-

tractiojn, 576.

-END OF THE ONE HUNDRED AND FOURTEENTH VOLUME (SERIES A).

MINUTES OF MEETINGS OF THE ROYAL SOCIETY.

January 13, 1927.

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.Allen, Herbert Stanley.Allmand, Arthur John.Anrep, Gleb.Appleton, Edward Victor.Austen, Ernest Edward.Bailey, Edward Battersby.Baker, George Stephen.Ballance, Sir Charles Alfred. Bateman, Harry.Bolton, Joseph Shaw.Borley, John Oliver.Borradaile, Lancelot Alexander. Brooks, Frederick Tom.Brown, Thomas Graham. Browning, Carl Hamilton.Budge, Sir Ernest Alfred Thompson

Wallis.Burne, Richard Higgins.Burt, Cyril Ludowic.Carslaw, Horatio Scott.Carter, Frederick William. Chadwick, James.Chapman, Frederick. Christopherson, John Brian.Clark, Alfred Joseph.Cook, Stanley Smith.Crowther, James Arnold.Cummins, Stevenson Lyle.Dean, Henry Roy.Denny, Sir Archibald.Dhar, Nilratan.Dobson, Gordon Miller Bourne. Druce, George Claridge.Drysdale, Charles Vickery.

Duckworth, Wynfrid Laurence Henry.

Dye, William David.Edwards, Charles Alfred. Eltringham, Harry.Evershed, Sydney.Farr, Clinton Coleridge.Fearnsides, William George. Ferguson, Allan.Ferranti, Sebastian Ziani de. Findlay, Alexander.Fleming, Alexander.Francis, Francis Ernest.Garner, William Edward.Gaskell, John Foster.Gates, Reginald Ruggles.Gill, Ernest Walter Brudenell. Goodwin, Sir George Goodwin. Gray, James.Gray, James Gordon.Gunn, James Andrew.Gye, William Ewart.Harrison, John William Heslop. Haworth, Walter Norman.Heilbron, Isidor Morris.Herring, Percy Theodore. Hinshelwood, Cyril Norman. Hinton, Martin Alister Campbell. Hippisley, Richard Lionel.Howe, George William Osborn. Hunter, James de Graaff.Huxley, Julian Sorell.Imms, Augustus Daniel.Inglis, Charles Edward.Jeffcott, Henry Homan.

[ iv ]

VI. “ On the Mutual Potential Energy of a Plane Network of Doublets.” By J. Topping. Communicated by S. Chapman. F.R.S.

VII. “ An Analysis of the Electro-Magnetic Field into Moving Elements.” By S. R. Milner, F.R.S.

VIII. “ Periodic Orbits of the Second Genus near the Straight-Line Equilibrium-Points in the Problem of Three Bodies.” ByD. Buchanan. Communicated by J. S. P laskett, F.R.S.

IX. “ The Deferred Approach to the Limit.” By L. F. R ichardson, F.R.S.

X. “ The Measurement of Absorptive Power.” By E. C. C. Baly, F.R.S., R. A. Morton and R. W. R iding.

XI. “ Absorption Spectra of Nitrates in the Region 300pp..” By R. A. Morton and R. W. R iding. Communicated byE. C. C. Baly, F.R.S.

X II. “ Observed Stark Patterns in Helium.” By J. S. F oster. Communicated by A. S. Eve, F.R.S.

X III. “ Some Theoretical Determinations of the Structure of Car­bonate Crystals. Parts I and I I .” By J. E. Lennard- J ones and B. M. Dent. Communicated by S. Chapman,F. R.S.

XIV. “Some Physical Properties of Icebergs and a Method for their Destruction.” By H. T. Barnes, F.R.S.

• XV. “ The First Step in the Approximate Solution of Differential Equations by Interpenetrating Lattices.” By J. A. Gaunt. Communicated by L. F. R ichardson, F.R.S.

X \ I. “ Adhesives and Adhesions : True Chemical Compounds as Adhesives.” By J. W. McBain, F.R.S., and W. B. Lee.

XVII. “ The Structure of Phenacite, Be2Si04.” By W. L. Bragg,F.R.S.

XVIII. “ On the Proportionality of Mass and Weight.” By H. H.P otter. Communicated by 0 . W. Richardson, F.R.S.

XIX. “ The Relations connecting the Angle-Sums and Volume of a Polytope of ^-Dimensions.” By D. M. Y. Somerville. Communicated by P. A. MacMahon, F.R.S.

XX. “ The Physical Interpretation of the Quantum-Dynamics.” By P. A. M. Dirac. Communicated by N. Bohr, For. Mem.R.S.

[ V ]

XXI. “ The Intensity of the Radiation from a Source of Electric Waves, when the Electric Constants of the Medium in the Neighbourhood of the Source are different from the Electric Constants at a Distance from it.” By H. M. Macdonald, F.R.S.

XXII. “ On Measurement of Intensity of Spectrum Lines.” By T. R.Merton, F.R.S.

XXIII. “ On Temperature and Pressure Regulation in PrismaticPhotographs.” By T. R. Merton, F.R.S.

[ V ]

XXI. “ The Intensity of the Radiation from a Source of Electric Waves, when the Electric Constants of the Medium in the Neighbourhood of the Source are different from the Electric Constants at a Distance from it.” By H. M. Macdonald, F.R.S.

XXII. “ On Measurement of Intensity of Spectrum Lines.” By T. R.Merton, F.R.S.

XXIII. “ On Temperature and Pressure Regulation in PrismaticPhotographs.” By T. R. Merton, F.R.S.

January 27, 1927.

Sir ERNEST RUTHERFORD, O.M., President, in the Chair.The following papers were read :—

I. “ The Effect of the Ovarian Hormone in producing pro-CEstrous Development in the Dog and Rabbit.” By S. A. Asdell and F. H. A. Marshall, F.R.S.

II. “Experiments on the Physiology and Genetics of the Smut Fungi.—Hyphal-Fusion.” By S. Dickinson. Communi­cated by Sir J ohn Russell, F.R.S.

III. “ A Contribution to our Knowledge of the Enteric Plexuses.”By C. J. H ill. Communicated by J. P. Hill, F.R.S.

IV. “Experiments on the Egg-Laying Instincts of the SawflyPontania solids Christ., and their Bearing on the Inheritance of Acquired Characters, with some Remarks on a New Principle in Evolution.” By J. W. H. Harrison. Com­municated by E. W. MacBride, F.R.S.

V. “ The History of the Cytoplasmic Inclusions of the Egg of Ciona intestinalis (L.) during Oogenesis and Fertilisation.” By L. A. Harvey. Communicated by E. W. MacBride, F.R.S.

VI. “ The Measurement of Percentage Haemolysis.—II. By E.P onder. Communicated by Sir Ernest Sharpey Schafer,F.R.S.

February 3, 1927.Sir ERNEST RUTHERFORD, O.M., President, in the Chair.

The following papers were read :—I. “ The Initial Stages of Gaseous Explosions. Part I—Flame

Speeds during the Initial ‘ Uniform Movement. By W. A. Bone, F.R.S., R. P. Fraser and D. A. Winter.

[ Vi ]

II. “ The Initial Stages of Gaseous Explosions. Part I I—An Examination of the Supposed Law of Flame Speeds.” By W. A. Bone, F.R.S., R. P. F raser and D. A. Winter.

III. “ On Detonation of Gaseous Mixtures of Acetylene and ofPentane.” By A. E gerton, F.R.S., and S. F. Gates.

IV. “ On Detonation of Gaseous Mixtures at High Initial Pres­sures and Temperatures.” By A. E gerton, F.R.S., and S. F. Gates.

V. “ Studies upon Catalytic Combustion. Part V.—The Union of Carbonic Oxide and other Gases with Oxygen in Contact with a Fireclay Surface at 500° C.” By W. A. Bone, F.R.S., and A. F orshaw.

VI. “ Experiments to Test the Possibility of Transmutation by Electronic Bombardment.” By M. W. Garrett. Com­municated by F. A. Lindemann, F.R.S.

VII. “ The Effective Cross-Section of the Oriented Hydrogen Atom.” By R. G. J. F raser. Communicated by H. M. Macdonald, F.R.S.

VIII. “ The Theoretical Prediction of the Physical Properties of Many-Electron Atoms and Ions. Mole Refraction, Dia­magnetic Susceptibility, and Extension in Space.” By L. Pauling. Communicated by A. Sommerfeld, For. Mem.R.S.

IX. “ The Electric Fields of South African Thunderstorms.” By B. F. J. Schonland and J. Craib. Communicated by C. T. R. Wilson, F.R.S.

X.—“ The Latent Heat of Vaporisation of Benzene at Tempera­tures above the Boiling Point.” By F. C. Lay, W. H. Prichard and J. A. Sutcliffe. Communicated by D. L. Chapman, F.R.S.

XI. “ The Function of Water Present in Silicic Acid Gel. The Structure of Silicic Acid Gel—Part I I .” By II. A. F ells and J. B. F irth. Communicated by F. S. K ipping, F.R.S.

XII. “ The Phenomena arising from the Addition of Hydrogen Peroxide to Silicic Acid Gel.” By H. A. Fells and J. B. F irth. Communicated by F. S. K ipping, F.R.S.

XIII. “ Anodic Overvoltage Measurements with the Cathode RayOscillograph.” By E. Newbery. Communicated by Sir E rnest R utherford, P.R.S.

XIV. “ Absorption of Radiation in the Extreme Ultra-Violet bythe Inert Gases.” By C. Cuthbertson, F.R.S.

[ Vii ]

XV. “ On a Relation between the Refractive and Dispersive Con­stants of the Inert Gases.” By C. Cuthbertson, F.R.S.

XVI. “ The Diffraction of Light by Metallic Screens.” By C. V. Raman, F.R.S., and K. S. Krishnan.

XVII. “ The Nature and Artificial Production of the (so-called) Voiced and Unvoiced Consonants.” By Sir Richard Paget. Communicated by Sir William Bragg, F.R.S.

XVIII. “ An Investigation into the Nature and Occurrence of the Auroral Green Line X 5577 A.” By J. C. McLennan, F.R.S., J. H. McLeod and W. C. McQuarrie.

XIX. “ A Further Contribution to the Study of the Phenomena of Intertraction.” By Sir Almroth Wright, F.R.S.

February 10, 1927.Sir ERNEST RUTHERFORD, O.M., President, in the Chair.Professor Ernst Julius Cohen, Foreign Member, was admitted into

the Society.

The following papers were read :—I. “ The Photographic Action of (3-Rays.” By C. D. Ellis and

W. A. Wooster. Communicated by Sir Ernest Ruther­ford, P.R.S.

II. “ The Relative Intensities of the Groups in the Magnetic (3-Ray Spectra of Radium B and Radium C.” By C. D. Ellis and W. A. Wooster. Communicated by Sir Ernest R utherford, P.R.S.

III. “ An X-Ray Investigation of Certain Long-Chain Compounds.”By A. Muller. Communicated by Sir William Bragg, F.R.S.

IV. “ On the Sparking Potentials of Discharge Tubes containingcarefully Purified Elements.” By J. Taylor. Communi­cated by 0. W. Richardson, F.R.S.

V. “ The Straggling of a-Particles from Radium C.” By G. H. Briggs. Communicated by Sir Ernest Rutherford,P.R.S.

VI. “ The Decrease in Velocity of a-Particles from Radium C.” By G. H. Briggs. Communicated by Sir Ernest Ruther­ford, P.R.S.

VII. “ On the Capture of Electrons by Swiftly Moving Electrified Particles.” By L. H. Thomas. Communicated by R. H. F owler, F.R.S.

[ viii ]

February 17, 1927.Sir ERNEST RUTHERFORD, O.M., President, followed by

Sir RICHARD GLAZEBROOK, Vice-President, in the Chair.The names of Candidates recommended for election into the Society

were read from the Chair, as follows :Appleton, E. V. Brown, T. G. Burne, R. H. Chadwick, J. Dobson, G. M. B. Ferranti, S. Z. de. Kendall, J. Laidlaw, P. P.

Lawson, A. A. Mellor, J. W. Rosenheim, 0 . Saha, M.Stopford, J. S. B. Thomas, H. H. Wenyon, C. M.

The following papers were read :—I. “ The Mechanism of a Thunderstorm.” By G. C. Simpson,

F.R.S.II. “ Wolfer’s Sunspot Numbers considered as a Disturbed

Periodic Series.” By G. U. Yule, F.R.S.III. “ Meteorological Perturbations of Tides and Currents in an

Unlimited Channel rotating with the Earth.” By H. H orrocks. Communicated by Sir J oseph Larmor, F.R.S.

IV. “ Measurements of Ozone in the Earth’s Atmosphere and itsRelation to other Geophysical Conditions—Part I I .” By G. M. B. Dobson, D. N. H arrison and J. Lawrence. Communicated by F. A. Lindemann, F.R.S.

V. “ The Stability of the Vortex System in the Rear of a MovingBody.” By H. Levy and A. G. F orsdyke. Communi­cated by S. Chapman, F.R.S.

VI. “ The Flow of Air and of an Inviscid Fluid around an EllipticCylinder and an Aerofoil of Infinite Span, especially in the Region of the Forward Stagnation Point.” By A. Fage. Communicated by L. Bairstow, F.R.S.

VII. “ The Mechanical Equivalent of Heat.” By T. H. Laby and E. 0 . Hercus. Communicated by Sir E rnest Rutherford, P.R.S.

VIII. “ The L Emission Spectra of Lead and Bismuth.” By C. E.E ddy and A. H. Turner. Communicated by Sir E rnest Rutherford, P.R.S.

IX. “ The Quantum Theory of the Emission and Absorption of Radiation.” By P. A. M. Dirac. Communicated by N. Bohr, For. Mem. R.S.

J[ ix

March 3, 1927.

Sir ERNEST RUTHERFORD, O.M., President, in the Chair.The following papers were read :—

I. “ An Investigation of the Rate of Growth of Crystals in Different Directions. ’ By M. Bentivoglio. Communicated by Sir Henry Miers, F.R.S. (Revised and read by H. L. Bowman.)

II. “ Doppler Effects and Intensities of Lines in the Molecular Spectrum of Hydrogen Positive Rays.” By M. C. J ohnson. Communicated by S. W. J. Smith, F.R.S.

III. “ A Vector Loci Method of Treating Coupled Circuits.” By E.Mallett. Communicated by T. Mather, F.R.S.

IV. “ The Thermal Conductivity of Carbon Dioxide.” By H.Gregory and H. Marshall. Communicated by H. L. Callendar, F.R.S.

V. “ Bands in the Secondary Spectrum of Hydrogen.” By H. S. Allen and I. Sandeman. Communicated by 0. W. R ichard­son, F.R.S.

VI. “ The Constants of the Magnetic Dispersion of Light.” By C. G. Darwin, F.R.S., and W. H. Watson.

March 10, 1927.

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

The following papers were read :—

I. “ The Viscous Elastic Properties of Muscle.” By A. Levin and J. Wyman. Communicated by A. V. Hill, F.R.S.

II. “ Changes in the Ovary of the Mouse following Exposure to X-Rays.” By F. W. R. Brambell and A. S. Parkes. Com­municated by J. P. H ill, F.R.S.

III. “Ovarian Regeneration in the Mouse after Complete DoubleOvariotomy.” By A. S. Parkes, U. F ielding and F. W. R. Brambell. Communicated by J. P. Hill, F.R.S.

IV. “ The Relation between ‘ Density ’ of Sperm-Suspension andFertility as determined by Artificial Insemination of Rabbits.” By A. Walton. Communicated by F. H. A. Marshall, F.R.S.

V. “ The Action of Glucosone on Normal Animals (Mice) and its Possible Significance in Metabolism.” By A. Hynd. Com­municated by Sir J ames Irvine, F.R.S.

[ X ]

March 17, 1927.

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

The following papers were read :—I. “ The Structure of Certain Silicates.” By W. L. Bragg, F.R.S.,

and J. West.II. “ The Analysis of Beams of Moving Charged Particles by a

Magnetic Field.” By W. A. W ooster. Communicated by Sir Ernest R utherford, P.R.S.

III. “ The Magnetic Susceptibility of some Binary Alloys.” By J. F.Spencer and E. M. J ohn. Communicated by W. Wilson, F.R.S.

IV. “ The Refractive Indices of Nicotine.” By J. W. Gifford andT. M. Lowry, F.R.S.

V. “ A Contribution to Modern Ideas on the Quantum Theory.” By H. T. F lint and J. W. F isher. Communicated by 0. W. R ichardson, F.R.S.

March 24, 1927.

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

The following papers were read :—

I. “ Interaction between Ipsilateral Spinal Reflexes acting on the Flexor Muscles of the Hind-limb.” By S. Cooper, D. E . Denny-Brown and Sir Charles Sherrington, F.R.S.

II. “ The Development and Morphology of the Gonads of the Mouse.” Part I. By F. W. R. Brambell. Communicated by J. P. H ill, F.R.S.

III. “ The Golgi Apparatus in the Cells of Tissue Cultures.” By R. J .Ludford. Communicated by J. A. Murray, F.R.S.

IV. “ The Nature of Golgi Bodies and other Cytoplasmic Structuresappearing in Fixed Material.” By C. E. Walker and M. Allen. Communicated by Sir J ohn F armer, F.R.S.

V. “ The Development of Chinese Leishmania in Majorvar. Chinensis and P. Sergenti var.” By W. S. Patton and E. H indle. Communicated by H. H. Dale, Sec. R.S.

VI. “ The Giant Cells in the Placenta of the Rabbit.” By G. S.Sansome. Communicated by J. P. H ill, F.R.S. ■

[ xi j

March31, 1927.

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

The following papers were read :—I. “ Alloys of Iron and Manganese of Low Carbon Content.” Bv

Sir Robert H adfield, F.R.S.

II. “ The Thermal and Electrical Conductivity of a Single Crystal of Aluminium.” By E. Griffiths, F.R.S.

III. “ The Transverse Magneto-Resistance Effect in Single Crystals ofIron.” By W. L. Webster. Communicated by Sir Ernest Rutherford, P.R.S.

IV. “ The Initial Stages of Gaseous Explosions. Part I II .” ByW. A. Bone, F.R.S., R. P. Fraser and F. Witt.

V. “ The Expansion of Charcoal on Sorption of Carbon Dioxide.” By F. T. Meehan. Communicated by Sir William Hardy,f .'r .s .

VI. “ The Equation of State of a Gaseous Mixture.” By J. E. Lennard-Jones and W. R. Cook. Communicated by R. H. F owler, F.R.S.