'^>^^'>--'"j-^V 



'Si^: 



SCIENCE PROGRESS 



A QUARTERLY REVIEW OF 

 SCIENTIFIC THOUGHT, WORK & AFFAIRS 



No. 60. APRIL 1 92 1 



CONTENTS 



RECENT ADVANCES IN SCIENCE : Mathematics (D. M. ^Vrinch) 

 —Applied Mathematics (S. Brodetsky)— Astronomy (H. Spencep- 

 Jones)— Physics (L. F. Bates)— Physical Chemistry (W. E. 

 Garner)— Organic Chemistry (P. Haas, D.Sc.)— Crystallography 

 (A. Scott, D.Sc.) -Botany (E. J. Salisbury, D.Sc.) Palseobotany 

 (M. C. Stopes, D.Sc.)— Plant Physiology (Prof. W^. Stiles)— 

 Zoology (Prof. C. H. O'Donoghue, D.Sc.)— Anthropology (A. G. 

 Thacker)- Medicine (R. M. Wilson). p. 517 



ARTICLES: The Physical Investigation of Soil (B. A. Keen, 

 B.Sc, F.Inst.P.)-Sex Heredity (A. S. Parkes)-Cooking and 

 Vitamines (E. M. Delf, D.Sc, F.L.S.). p. 574 



POPULAR SCIENCE : New Stars (Rev. A. L. Cortie, S.J., F.R.A.S., 

 F.Inst. P.). p. 613 



NOTES : Sir W^illiam Mather-Pure Science Again— De Moivre's 

 Theorem (Sir R. Ross)— Sociological Society -Science Masters* 

 Association (G. H. J. Adlam)— Our System of HolidaysDikinz 

 Drops iz Eitshiz (R. R.)— The Quarterly Report of the Research 

 Defence Society— Notes and News. p. 625 



CORRESPONDENCE: Inheritance of Acquired Characters 

 (J. S. Huxley and Prof. E. W^. MacBride, F.R.S.)-The Geological 

 Age of the Palajolithic Flint Instruments (J. R. Moir and 

 A. G. Thacker)— British Committee for Aiding Men of Letters 

 and Science in Russia P« 640 



ESSAY-RE VIEW^S : Highways and Byways in the Theory of 

 Numbers (L. J. Mordell)-The Completion of the Publication of 

 the Collected Papers of the Late Lord Rayleigh (Prof. A. W. 

 Porter, D.Sc). P- 647 



REVIEWS : Modern Analysis— Easy Lessons in Einstein-From 

 Newton to Einstein- Gyroscopic Compass-Ions, Electrons, and 

 Ionising Radiations— Nucleic Acids -Sugar from Cane and Beet 

 —Evolution of the Earth and Its Inhabitants— AVater Plants- 

 Structure and Reproduction of Plants-Influence of Man on 

 Animal Life in Scotland-Coal in Great Britain- Pre-Palseo- 

 lithic Man-Primitive Time-Reckoning -Secretum Secretorum 

 -Social Development-Optical Projection— and other Reviews. 



p. 65S 



EDITOR 



SIR RONALD ROSS, K.C.B., K.C.M.G., F.R.S., N.L. 



ASSISTED BY 



D. ORSON WOOD, M.Sc, A.R.C.Sc, and 

 J. BRONTE GATENBY, B.A., B.Sc, D.Phil. 



LONDON : JOHN MURRAY, ALBEMARLE STREET, W. 



Prkf 6/' «<?/, l^y post 6/5 Annual Subscription £1 4s, Od.^ 



by post £1 5s, 6d. 



VOL. XV 



