SCIENCE PROGRESS 



A QUARTERLY REVIEW OF 

 SCIENTIFIC THOUGHT, WORK & AFFAIRS 



No. 52. APRIL 19 1 9 



CONTENTS 



RECENT ADVANCES IN SCIENCE: Philosophy "(H. Elliot- 

 Mathematics (P. E. B. Joupdain)— Astrononay (H. S. Jones)— 

 Physios (J. Rice)- Physical Chemistry (Prof. W. C. McC. Lewis, 

 D.Sc.)-Organie Chemistry (P. Haas, D.Sc.)- Geology (G. W. 

 Tyrrell) -Botany (E. J. Salisbury, D.Sc.)— Plant Physiology 

 (E. C. Knight, D.Sc.)— Anthropology (A. G. Thacker). 



ARTICLES : Recent Work; on the Spectra of X-Rays (Prof. W. H 

 Bragg, C.B.E., D.Sc, F.R.S.)— The Ice-Age Question Solved (R. A. 

 Marriott, D.S.O.)-Growth and Division of Cells as Affected by 

 Radiation (Sidney Russ, D.Sc). 



POPULAR SCIENCE : Some Scientific Aspects of Cold Storage 

 (Ingvar Jttrgensen, Cand. Phil., D.I.C., and Walter Stiles, 

 M.A.). 



CORRESPONDENCE: A National Science Library (R. E. Slade, 

 D.Sc.) -Science and the International Language (H. Whiehello). 



NOTES : Rights against Duties— The General Meeting of the As- 

 sociation of Public School Science Masters (C. L. Bryant, B.Sc.) 

 —The Teaching of the History of Science- Health Conscription 

 —The Discovery of the Calculus (R. R.)-The Exhibition of the 

 British Science Guild- Alan Milne (Sir R. Ross)-Dead Darwin 

 —The Mathematical Amoeba— How to Pay one's Debts-Notes 

 and News (D. Orson Wood, M.Sc.)-and other Notes. 



ESSAYS: Mathematics in an Encyclopaedia (P. E. B. Jourdain) 

 —The General Theory of Relativity and Einstein's Theory of 

 Gravitation (G. W. de Tunzelman, B.Sc.)— Dry-Rot in Govern- 

 ment Housing Schemes (Lord Leverhulme)— War : A Plea for 

 Scientific Research, Part I. (Major-Gen. Charles Ross, C.B., 

 D.S.O.). 



ESSAY-REVIEWS: Theories of Audition (Prof. E. H. Barton, 

 F.R.S., D.Sc). 



REVIEWS : Differential Equations-Projective Geometry— Theory 

 of Measurements- Astronomical Observatories of Jai Singh— 

 Les Progres de la Physique Moleculaire— Grasses and Grass- 

 lands of South Africa-Botany of Crop Plants-Fungi and 

 Disease in Plants-Biology-Evolution— Crime and Criminals 

 —and other Reviews. 



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. BRONTfi GATENBY, B.A., B.Sc. 



LONDON : JOHN MURRAY, ALBEMARLE STREET, W. 



Price 6/- net 



VOL. XIII 



