296 



NATURE 



[October 27, 192 1 



The Chemistry of the Garden : A Primer for 

 Amateurs and Young Gardeners. By H. H. Cousins. 

 Revised edition. Pp. xxxi+147. (London: Mac- 

 millan and Co., Ltd.) 2s. net. 



The Elements of Physics and Chemistry : .\ Practi- 

 cal Course for Middle Forms. By Sir Richard 

 Gregory and A. T. Simmons, with the .Assistance of 

 F. W. Hodges. Pp. vii + 299. (London: Macmillan 

 and Co., Ltd.) 45. 6d. 



Diary of Societies. 



THURSDAY, October 27. 



Institition- of ;^fiNTNO AND AFETALLrROT (at Geological Society's 

 Rooms), at 5.30. — L. Hill: Ventilation and Huwan Efficiency. — 

 J. N. Justice: Notes on the Ore Deposits of Eagle llountain, 

 Demerara. 



CHilD-SirDr SociETT (at Birkbeck Colleg-e), at 6.— Discussion on 

 Individual Training in the School.— Miss Bassett : The Dalton 

 Plan. — Miss ^fackinder : Individual Work. — Mrs. Bottrill : Ver- 

 tical Classification. 



Egypt Explohatiox Society (at Royal Society Rooms), at 8.30. — 

 P. E. Newberry : Early Relations of Egypt, Babylonia, and 

 Syria. 



BorAL Society of JFedicine (Urology Section), at 8.30.— Presidential 

 Address bv Sir Thomas Horder : The Medical Aspect of Some 

 Urinary Diseases. 



FRIDAY, October 28. 



Physical Society of London (at Imperial College of Science), 

 at 5. — S. Butterworth : On the Use of Anderson's Bridge for the 

 Measurement of the Variations of the Capacity and Effective 

 Resistance of a Condenser with Frequency. — S. Butterworth : 

 Notes on Earth Capacity Effects in Alternating Current Bridges. 

 — F. G. H. Lewis : An Automatic Voltage Regulator. — Prof. A. S. 

 Heramv : The Flow of Viscous Liquids through Slightly Conical 

 Tubes." 



Institution' op Mechanicat, Engineers, at 6. — Continuation of Dis- 

 cussion on the Eleventh Report of the Alloys Research Com- 

 mittee on Some Alloys of Aluminium. 



RoYAi Society of Medicine (Epidemiology and State Medicine Sec- 

 tion), at 8. — Dr. L. 6. Haydon : Plague in Wild Rodents in 

 South .\^frica. 



MONDAY. October 31. 



Tnstitite of ACTrARTES. at ,5. — E. H. Lever : An Investigation into 

 the ifortalitv experienced by Life Tenants under Reversions, 

 with some Conclusions drawn therefrom. 



TUESDAY, November 1. 



T\IiNERALOGiCAL SOCIETY, at ."> 30,— A nniversary Meeting. — Prof. H, 

 Hilton : On the Determination of the Optic Axes of a Crystal 

 from Extinctrnn-angles. — Dr. J. Drugman : An Example of Quartz 

 Twinned on the Sardinian Law,- — Dr. L. J, Spencer : Biographical 

 Notices of Jlineralogists recently deceased, with an Index of 

 those Previously Published in the Mineralogical Maf/azitie. 



Institftion of Civil Engineers, at 6. — Inaugural Address by the 

 President, W. B. Worthington, 



ItfiNTGEN Society (at Institution of Electrical Engineers), at 8,15. — 

 Prof. J, W. Nicholson : Presidential Address, 



WEDyESDAY, November 2, 

 HoYAl Society of Arts, at 8. — A, A. Campl>ell Swinton : Wireless 



Telegraphy (Inaugural Address). 

 Society of Public Analysts (at Chemical Society's Rooms), at 8. — 

 Dr, C. Butler Savory: An Improved Specific Gravity Apparatus. 

 -Dr. J. C. Drummond and Dr, A. F. Watson: The Testing of 

 Foodstuffs for Vitamins. — A. Lucas : The Inks of Ancient and 

 Modern Egypt, 



THURSDAY, November 3. 



Eoyal Society, at 4.30,— Prof. T. R. Merton : On the Spectra of 

 Lead Isotopes.- -G. I, Taylor : Experiments with Rotating Fluids, 

 — Prof. L. Bairstow, Miss B, ^[, Cave, and Miss K, D, Lang : 

 The Two-dimensional Slow Jlotion of Viscous Fluids, — Prof. 

 H. C, H, Carpenter and Constance Elam : The Production of Single 

 Crystals of Aluminium and their Tensile Properties. — Prof, 

 C, V. Raman and B, Ray : On the Transmission Colours of 

 Sulphur Suspensions. — Prof. E, F. Burton and Miss E, Bishop : 

 The Law of Distribution of Particles in Colloidal Solution, 



Institition of Electrical Engineers, at 6, — J. S, Highfleld : In- 

 augural Address. 



■Chemical Society, at S.^Informal Meeting. 



FRIDAY, November 4, 



Boyal Astronomical Society (Geophysical Discussion'), at 5, — Col. 

 H, G. Lyons, Prof, C, V, Boys, Col, E, H, Grove-Hills, and Col, 

 Sir G. P, Lenox-Conyngham : The Eotvos Gravity Balance, 



Institution of JMechanical Engineers, at 6,^Dr, H, S. Hele-Shaw : 

 Power Transmission by Oil (Thomas Hawksley Lecture), 



PUBLIC LECTURES. 



(.1 number in brackets iiiiiicates the number of a lecture 

 i7i a series.) 

 THURSDAY, October 27, 

 Kino's Coliege, at 5,30. — H. W. Pitz-Simons : Bridge Construc- 

 tion (2). 



NO. 2713, VOL. 108] 



FRIDAY, October 28. 

 University Colleok. at 4,30.— Dr. J. C. Drummond: Nutrition (8). 



MONDAY, October 31. 

 Birkbeck ColleSe, at 5,30, — L, Bolton : Relativity (2), 

 King's College, at 5,30.— H. Moore: Liquid Fuels (2). 



TUESDAY, November 1, 



King's College, at 5.30,— Prof, H, Wildon Carr : The Modern 



Scientific Revolution and its Meaning for Philosophy (4). — Event 



»nd Object. — Dr. W. Brown: Psychology and Psychotherapy (3i. 



— L, J, Hunt: Cascade Synchronous Motors and Generators (3), 



WEDNESDAY. November 2. 

 University College, at 3.— Prof . E. Q. Gardner : Nature in the 



Divina Cammedia (Barlow Lectures on Dante). 

 King's College, at 4,30, — Dr. C, Da Fano : Histology of th« 



Nervous System (4). At 5.15. — Prof. A, Dendy : Fauna of the 



British Empire. 



THURSDAY, November 3. 

 University College, at 5.— Prof. J, E, G. De Montmorency: 



Feudalism: The Background of the European System (1), 

 Imperial College of Science and Technology, at 5,30, — W, Bateson : 



Recent Advances in Genetics (1). 

 Chadwick Public Lecture (at Royal Institute of British Archi- 

 tects), at 8.— Prof, P. Groom: Dry Rot of Wood and Sanitation. 

 FRIDAY. November 4, 

 University Collk&k, at 4,30. — Dr, J, C, Drummond: Nutrition (4'>. 



At 8— Prof. G, Dawes Hicks: Our Knowledge of the Real 



World (1). 



CONTENTS. PACE 



A Tropical College of Agriculture 265 



Cellulose Esters , . 266 



History of Birds in Britain 2f8 



Chromium, Platinum, and Lead Ores. By J. W. G. 268 



The Phoenicians in Sicily 269 



Our Bookshelf . . , , 270 

 Letters to the Editor: — 



Biological Terminology.— Dr. F. A. Bather, F.R.S. 271 

 Indian Land MoUusca.— Sir A, E. Shipley, G.B.E,, 



F.R.S .... 271 



Safeguarding of Industries Act, 1921. — Prof. L. 



Bairstow, F.R.S,, and Major A. G. Church 271 

 Aurora Borealis, Terrestrial Magnetic Disturbances, 



and Sun-spots.— Father A. L. Cortie, S.J. . . 272 

 Sex-change in the Native Oyster. — W. L. Calder- 



wood ..... 272 

 A Relation between the Combined Atomic Volumes 

 and their Optical Refractivities. {With Z)«a- 



^raw.)— Gervaise Le Bas 272 



Ilybridity and the Evolution of Species. — Prof. J. P. 



Lotsy ; The Writer of the Article 274 



A System of Space-Time Co-ordinates.— J. L. Synge 275 

 Aeroplane Photography for Archaeology. — A. P. 



Trotter , 275 



Cosmic Friction: A Query.— Sir Oliver Lodge, 



F.R S 275 



•Muscular Piezo-electricity ? — E. Wriothesley 



Russell ... . . . ., ... 27s 



Speaking Films. (Illustrated.) By Prof. A. O. 



Rankine 276 



The Oppau Explosion 278 



The Age of the Earth. By The Right Hon. Lord 

 Rayleigh, F.R.S.; Prof. W. J. SoUas, F.R.S.; 

 Prof. J. W. Gregory, F.R.S.; and Dr. Harold 



Jeffreys 279 



Obituary: — 



Dr. A. S. F. Leyton. By G. S. W 284 



Sir William Garforth 285 



Notes .... 287 

 Our Astronomical Column : — 



The Total Solar Eclipse of September, 1922 .... 291 



Rubidium in the .Sun 291 



Comets , 291 



Finding of the Minor Planet Alinda 291 



Observations of Variable Stars 291 



Cambridge and Women 292 



Aerial Photography 292 



University and Educational Intelligence . . .292 



Calendar of Scientific Pioneers . ....... 293 



Societies and Academies ... . . 294 



Books Received 295 



Diary of Societies 296 



