200 



NATURE 



[May 9, 191 8 



to the late Gen. Bassot.— A. Veronnet : Contraction 

 and evolution of the sun. — F. Roux : The gold minerals 

 of the Ivory Coast. Analyses of some specimens col- 

 lected by the author at Kokumbo. The metallic 

 portion of a quartz, without visible gold, gave bis- 

 muth 48 per cent., tellurium 37 per cent., gold 836 per 

 cent. Two metallic specimens, extracted from the 

 mineral from Poressou and containing 7678 per cent, 

 and 9304 per cent, of gold, also contained tellurium and 

 bismuth. — F. La Marca : A new hybrid produced by 

 grafting. — A. Guilliermond : The nature and significa- 

 tion of the chondriome. — J. Amar : Physiological pro- 

 thesis of the foot.— L. Lumifere : A phenomenon of 

 singular appearance relating to the persistence of 

 luminous impressions. 



BOOKS RECEIVED. 



Organic Compounds of Arsenic and Antimony. By 

 Prof. G. T. Morgan. (Monographs on Industrial 

 Chemistry.) Pp. xx + 376. (London : Longmans and 

 Co.) 165. net. 



Edible Oils and Fats. By C. A. Mitchell. 

 Pp. xii+159. (Monographs on Industrial Chemistry.) 

 (London : Longmans and Co.) 65. 6d. net. 



Soil Physics and Management. By Prof. J. G. 

 Mosier and A. F. Gustafson. Pp. xiii + 442. (Phila- 

 delphia and London : J. B. Lippincott Co.) 8s. 6d. 

 net. 



Veterinary Post-Mortem Technic. By Prof. W. J. 

 Crocker. Pp. xiv + 233. (Philadelphia and London : 

 J. B. Lippincott Co.) i6s. net. 



. A Not Impossible Religion. By S. P. Thompson. 

 Pp. xv + 335. (London: J. Lane.) 6s. net. 



Mind and the Nation. By J. H. Parsons. Pp. 154. 

 (London : John Bale, Ltd.) 7s. 6d. net. 



The Photographic Industry of Great Britain, 1918. 

 (London : British Photographic Manufacturers' Asso- 

 ciation, Ltd.) 



Year-Book of the Scientific and Learned Societies 

 of Great Britain and Ireland. Thirty-fourth annual 

 issue. Pp. vii + 334. (London: C. Griffin and Co., 

 Ltd.) 9s. 



Tropic Days. 'By E. J. Banfield. Pp. 313. 

 (London: T. Fisher Unwin, Ltd.) i6s. net. 



DIARY OF SOCIETIES. 



THURSDAY, May 9. 

 RovAL SociRTV, at 4.30.— Contribution to the Theory of Attraction 



when the Force vnries as any Power of the Distance : Major P. A. 



MacMahon and H. B. C. Darling.— Electromagnetic Integrals : Sir 



George Greenhill. ^Intensity Relations in the Spertrum of Helium : Dr. 



T. R. Merton and Prof. J. W. Nicholson.— The Outline of a Theory 



of Magnetic Storms : Dr. S. Chapman. 

 Royal Institution, at 3.— The Folk Lore of Bells: Sir T- G. Frazer. 

 Royal Society of Arts, at 4.30.— The Freedom of the Sea: Sir F. T. 



Piggott. 

 Institution of Electrical Engineers, at 6— Discussion : A British 



Electrical Proving House. Opener, C. Turn'oull. 

 Optical Society (Imperial College of Science and Technology), at 7.— 



Note on Spherical Aberration : T. Y. Baker and Major L. N. G. Filon. 

 Mathematical Society, at 5.— The Continued Fractions connected 



with the Hypargeomelric Equation : E. Lindsay Ince. 



FRIDAY, May 10. 



Royal Institution, at 5.30.— Human Nutrition : Prof. F. Gowland 

 Hopkins. 



Royal Astronomical Society, at 5.— Observaiions of Encke's Comet 

 (1917c) made with the 28-in. Equatorial : Royal Observatory, Greenwich. 

 —Absurd Conclusions Derived from Einstein's Gravitation 1 heory : L. 

 Silbersiein.— A New Variable Star in Auriga : A. Stanley Williams.— 

 Baxendell's Observations of Variable Stars : H. H. Turner and M.iry A. 

 'ii\3.gz.— Probable Papers: The Measurement of Time to the Thousardth 

 of a Second: R. A. Sampson.— The Variation of Latitude. Observations 

 of Sirius and Procyon made with the 28-in. Refractor of the Royal 

 Observatory, Greenwich : Sir F. W. Dyson.— The Period of Sirius: R. 

 Jonckheere.— Twelfth Note on the Numljer of Faint Stars with L»rge 

 Proper Motions : F. A. Bellamy. 



Physical Society, at 5.— The Times of Sudden Commencement of Mag' 

 netic Storms : Dr. S. Ghapraan. — The Entro^^y of a Metal : Dr. H. S* 

 Allen. — Tracing Rays through an Optical System : T. .Smith. 

 MONDAY, May 13. 



Royal Society of Arts, at 4.30. — Recent Developments in Leather 

 Chemistry : Prof. H. R. Procter. 



Royal Geographical Society, at 8. 30. — The Achievements of France 

 in Morocco : J. M. MacLeod. 



Victoria Institute, at 4.30.— Terrestrial Magnetism : Dr. S. Chapman. 



TUESDAY, May 14. 

 RovAL Institution, at 3.— Field-Anthropologists : Prof. A. Keith. 

 Royal Society of Arts, at 4.30. — Recent Developments in Leather 



Chemistry : Prof. H. R. Procter. 

 Royal Statistical Society, at 5.13.— The Effect of Trade Fluctuations 



upon Profits: Di. J. C. Stamp. 

 Illuminating Engineering Society, at 6.30. — Discussion : The Lighting, 



Heating, and Power Order (rgiS), and the Best Methods of Making 



Economies. 



WEDNESDAY, May 15. 

 Royal Society of Arts, at 4.30. — The Timber Industry: Prof. Percy 



Groom. 

 Royal Meteorological Socjety, at 5. — Continentality and Tempera- 



lure. II. : The Effect of Latitude on the Influence of Continentality on 



Temperature : C. E. P. Brooks. — Report on the Phenological Observa- 

 tions for 1917: J. E. Clark and H. B. Adames. 

 Geological Society, at 5.30.— The Geology of the Italian Front : Prof. 



E. J. Garwood. 

 Society of Glass Technology (Institute of Chemistry), at 2.30. — Furnace 



and Factory Operation for Automatic Glass-working Machinery : A. R. 



Hunter.— The Glass Industry after the War : W. F. J. Wood. 



THURSDA y. May 16. 



Royal Society, at 4.30. — Probable Papers: General Factors in Mental 

 Measurements : J. C. M. Garnett. — The Absorption of X-Rays in Copper 

 and Aluminium : C. M. Williams. — The Electrical Resolution and Broad- 

 ening of Helium Lines : Dr. T. R. Merton. 



Royal In.stitution, at 3.— The Prosecution and Punishment of Animals : 

 Sir J. G. Frazer. 



Royal Society of Arts, at 4.30.— The Freedom of the Sea: John 

 Leyland. 



Institution of Mining and Metallurgy, at 5.30. 

 FRIDAY, May 17. 



Royal Institution, at 5.30. — The Story of a Grass : Dr. A. B. Rendle. 



CONTENTS. P-\GE 



Social Heredity 181 



Forestry in Corsica, Algeria, and Tunisia 182 



The Development of Surgery 182 



Our Bookshelf 183 



Letters to the Editor: — 



"Bread-crust" Volcanic Bombs. — Prof. T. G. 



Bonney, F.R.S. ; J. S. F. . 184 



Recovery of Speech through Excitement.— Capt. J, 



Newton Friend 184 



The Promotion of Post-graduate Work and 



Research. By W. A. T. 184 



Ancient Plant-names 186 



Water-power in Great Britain. By Dr. Brysson 



Cunningham 186 



Some American Views on Aeronautics. By G. H. B. 187 



Notes 188 



Our Astronomical Column : — 



Photographs of the Spectrum of Venus 192 



Radial Velocities by Objective Prism 192 



Recent Marine Biology. By J. J ^93 



Science and Technology in New Zealand 193 



The Carnegie Institution and the " Humanities" . 194 



University and Educational Intelligence 197 



Societies and Academies • . i97 



Books Received 200 



Diary of Societies 200 



Editorial and Publishing Offices: 



MACMILLAN AMD CO., Ltd., 



ST. M.'^RTIN'S STREET, LONDON, W.C.2. 



Advertisements and business letters to be addressed to the 

 Publishers. 



NO. 2532, VOL. lOl] 



Editorial Communications to the Editor. 

 Telegraphic Address : Phusis, London. 

 Telephone Number : Gerrard 8830. 



