252 



NATURE 



[April 22, 1920 



Butter and Cheese. By C. W. Walker Tisdale and 

 J. Jones. Pp. ix+142. (London: Sir Isaac Pitman 

 and Sons, Ltd.) 2S. 6d. net. 



Panchromatism. Second edition. Pp. 32 + x plates. 

 (Ilford : Ilford, Ltd.) 6d. 



Photography and its Applications. By W. Gamble. 

 Pp» xii+132. (London: Sir Isaac Pitman and Sons, 

 Ltd.) 2s. 6d. net. 



Diary of Societies. 



THURSDAY, April 22. 



RovAL Institution of Great Britain, at 3.— S. Skinner : The Tensile 

 Strength of Liquids. 



Royal Society, at 4.30.— Prof. W. E. Dalby: Researches on the 

 Elastic Properties and the Plastic Extension of Metals.— H. W. 

 Hilliar : Experiments on the Pressure Wave thrown out by Sub- 

 marine Explosions. — E. F. Armstrong and T. P. Hilditch : A Study 

 of the Catalytic Action at Solid Surfaces. III. The Hydrogenation of 

 Acetaldehvde and the Dehydrogenation of Ethyl Alcohol in the Presence 

 ofEinely Divided Metals. IV. The Interaction of Carbon Monoxide 

 and Steamas conditioned by Iron Oxide and by Copper. — Dr. T. R. 

 Mprton : The Structure of the Balmer Series of Hydrogen Lines. — Prof. 

 H. A. Wilson : Diamagnetism due to Free Electrons. 



London Mathematical Society, at 5.— G. T. Bennett : The Three-bar 

 Sentic Curve.— S. Chapman and G. H. Livens : The Influence of Diff'usion 

 on the Propagation of Sound Waves in Aii.— W. P. Milne and D. G. 

 Taylor: TheRelation between Apolarity and the Pippian-Quippian 



Syzygy.— G. H. Hardy and J. E. Littlewood : Some Problems of 



hant' " ■ ■ " ■ ■ 



Triangle. 



Diophantine Approximation ; The Lattice-points of a Right-angled 



Institution of Civil Engineers (Students' Section), at 6.— C. M. Brain: 

 Compression Refrigeration. 



FRIDAY, April 23. 



RpVAL Society of Medicine (Study of Disease in Children Section), at 

 4.30-— Dr. D. H. Paterson : Three Cases of Renal Dwarfism.— Dr. Parkes 

 Weber: Remarkable Example of Suprarenal Tumour in a Child, of the 

 Robert Hutchison Type(?).— (Epidemiology and State Medicine Section), 

 at 8.30.— Dr. K. W. Goodall : Typhus in Poland, 1916-19. 



Physical Society, at 5.— M. C. E. Guillaume : The Anomaly of the 

 Nickel-Iron Alloys : Its Causes and its Applications (Guthrie Lecture). 



Institution of Mechanical Engineers, at 6.— The late W. J.Lineham : 

 (i) The Hardening of Screw-Gauges with the Least Distortion in Pitch 

 (referring to Water Hardening). (2) The Hardening of Screw-Gauges 

 with the Least Distortion in Pitch (referring to Oil Hardening). 



Junior In.stitution of Engineers, at 7.30.— R. S. Fox : Modern 

 Developmenis in Motor-car Design. 



Royal In.stitution of Great Rritain, at 9.— Sir Israel GoUancz: 

 Shakespeare's Shylock and Scott's Isaac of York. 

 SATURDAY, April 24. 



Royal Institution of Great Britain, at 3.— Prof. W. H. Eccles: The 

 Thermionic Vacuum Tube as Detector, Amplifier, and Generator of 

 Electrical Oscillations. 



MONDA Y, April 26. 

 Victoria Institute (at the Central Hall, Westminster), at 4.30.— Dr. 



T. G. Pinches : Babylon in the Days of Nebuchadnezzar. 

 Aristotelian Society (at 74 Grosvenor Street), at 8.— Dr. W. M. 



McGovern : The Development of Buddhistic Metaphysics in China and 



Japan. 

 Royal Society of Arts, at 8.— Dr. W. Rosenhain: Aluminium and its 



Alloys (Cantor Lecture). 

 Royal Society of Medicine (Odontology Section), at 8.— G. B. Ash : 



A F.-ictor in the Pathology of Pyorrhoea.— H. Stobie : The Problem of 



Infection about the Apex of the Tooth. 



TUESDAY, April 27. 

 Royal HorticultXjral Society, at 3.— P. C. M. Veitch : Magnolias. 

 Royal Institution of Great Britain, at 3.— Prof. A. Keith : British 



Ethnology: The Invaders of England. 

 Institution of Civil Engineers (Annual General Meeting), at 5.30. 

 Zoological Society of London, at 5.30. — F. F. Laidlaw; Contributions 



to a Study of the Dragonfly Fauna of Borneo. Part IV. A List of the 



Species known to occur in the Island. — Dr. R. I'.room: Some new 



Thferocephalian Reptiles from the Karroo Beds of South Africa. 

 Royal Photographic Society of Great Bkitain (Lantern Meeting), 



at 7.— Capt. C. W. R. Knight: Wild Life in the Tree Tops. 

 WEDNESDAY, April 28. 

 Royal Society of Arts, at 4.30.— Brig-Gen. C. H. Sherrill: Ancient 



Stained Glass. 

 Rov.-\L Aeronautical Society (at Royal .Society of Arts), at 8. — Maj.- 



Gen. Sir S. Brancker : Aerial Transport from the Business Point of View. 

 . THURSDAY, April 2q. 

 Royal Institution of Great Britain, at 3. — R. Campbell Thompson: 



The Origins of the Dwellers in Mesopotamia. 

 Rov^i. Society; 2,t ^.Tfi.—Ptobable Papets.—Vroi.J. W. Gregory: The' 



Irish Eskers.— Miss. K. M. Curtis: The Life-History and Cytology of 



Synchytriii7ii endnboiicnin (Schilb ) Perc. . the Cause of Wart Disease in 

 i'J'ptato.-^B. S^hni : The Structiire and h^vaMi-oi Acmofyle Puncher i 

 .;^ilger. 



209LOGical_ Society of London, at 4.30. — Annual General Meeting. 

 Chemical Society, at 5.— Extraordinary General Meeting to consider the 



Alterations in theBy-laws proposed by ihe Cduncil. ; ' ■' ' ' 



Child-Study Societv (at Royal Sanitary Institute), at 6.-:-Sir A. E. 



Shipley : Biting Insects and Children. 



Institution OF Electrical Engineers (at Institution of Civil Engineers)i 



at 6.— A E. McColl : Automatic Protective Devices for Alternating 



Current Systems. 

 Optical Society (at Imperial College of Science and Technology), at 7.30. 



— Dr. C. E. Kenneth Mees: The Reaction of the Eye to Light. 

 FRIDAY, April 30. 

 Wirelfss Society of London (at Institution of Civil Engineers), at 6. — 



Major B. Binyon : .\ Wireless " Call " Device. 

 Institution of Electrical Engineers (Students' Meeting) (at Faiaday 



House), at 7. — J. E. Holmstrom : Tidal Power. 

 Institution of Mechanical Engineers (Informal' Meeting), at 7.— 



A. P. Bale and Others : Discussion on Suggested Means of Improving 



and Increasing the Services of the Institution to Members. 

 RovAL Institution op Great Britain, at 9.— Prof. F. O. Bower : The 



Earliest-known Land Flora. 



SATURDAY, May i. 

 Royal Institution of Great Britain, at 3.— Dr. F. Chaaiberlin : 



The Private Character of Queen Elizabeth ; at 5.— Annual Meeting. 



CONTENTS. PAGE 



The Promotion of Medical Research 221 



A Study in Palaeogeography, By Prof. A. C. 



Seward, F.R.S 223 



Wheat and Wheat-growing. By Dr. E. J. Russell, 



F.R.S 224 



The Fertilisation of the Ovum. By A. D 225 



W^isdom of Life and Existence 226 



New Books on Industrial Chemistry, By G. M. . 227 



Our: Bookshelf 228 



Letters to the Editor:— 



The .Separation of the Element Chlorine into Normal 

 Chlorine and Meta-Chlorine, and the Positive Elec- 

 tron. {With Diagrams.)— Prof. William D. 



Harkins ; Dr. F. W. Aston . 230 



On Atomic and Molecular Structure. — Dr. A. E. 



Oxley .• 231 



Aquarium Cultures for Biological Teaching. — Dr. 



Monica Taylor, S.N.D. 232 



lonisation in the Solar Chromosphere. — M. N. Saha 232 

 Gravitational Deflection of High-speed Particles.— 



Leigh Page 233 



Science and the New Army.— K. E. Edgeworth . 233 



The Universities and the Army.— F. J. M. Stratton 234 



Early Hawthorn Blossom. — Lady Rose ..... 234 



The Doctor of Philosophy in England, -Dr. Henry O. 234 



Forbes 234 



Progress in Naval Engineering. By H. C. H. C. . 235 

 The Investigation of Grain Pests. By Dr. A. D. 



Imms ... .236 



Some Applications of Physics to War Problems 237 

 Obituary: Prof. J. A. McClelland, F.R.S. By 

 A. W. C— Dr. J. G. Bartholomew. By Geo. G. 



Chisholm 238 



Notes . 240 



Our Astronomical Column : — 



Occultation of a Star by Saturn 244 



The Einstein Displacement of Spectral Lines .... 244 



Stellar Spectroscopy at the Detroit Observatory . . . 244 



Meteorology at Hong-Kong ....... 244 



Milk Production of Ayrshire Cattle 245 



The Ignition Points of Liquid Fuels ....... 245 



Naval Research and Experiment . . .' 245 



Education and Science in the Civil Service Esti- 

 mates for 1920-21 246 



The Native Tribes of Western Australia .... 248 



University and Educational Intelligence .... 248 



Societies and Academies 249 



Books Received 251 



Diary of Societies 252 



. . Editorial. and Publishing Offices: 



. MACMILLAN AND CO., Ltd., 

 : Sr. MARTIN'S STREET, LONDON, W.C.2. 



Advertisements and business letters to be addressed to the 

 Publishers. ^ 



/ , Editorial Communications to the Editor. 

 ' ' Telcg,raphtc Address: Phusis. London. 

 ' ' ■ Telephone Number : C^rrard 8830. 



NO. 2634, VOL. 105] 



