SCIENCE PROGRESS 



A QUARTERLY REVIEW OF 

 SCIENTIFIC THOUGHT, WORK & AFFAIRS 



No. 58. OCTOBER 1920 



CONTENTS 



RECENT ADVANCES IN SCIENCE: Philosophy (H. Elliot) 

 Astronomy (H. Spencep-J ones)— Physics (D. O. >Vood, M.Sc.)— 

 Physical Chemistpy (>V. E. Garnep, M.Sc.) Opgranic Chemistry 

 (P. Haas, D.Sc.)-Cpystallogpaphy (A. Scott, D.Sc.)- Botany 

 (E. J. Salistaupy, D.Sc.)-Plant Physiology (R. C. Knigrht, 

 D.Sc.)— Palseontologry (Vl. P. Pycpaft)— Anthpopologry (A. G. 

 Thackep). p. 173 



ARTICLES: Mass-Spectpa and the Atomic Welg-hts of the 

 Elements (F. W. Aston, M.A., D.Sc, A.I.C.)-The Measure- 

 ment of Surface Tension (W. N. Rae, M.A., and J. Reilly, 

 M.A., D.Sc.)— A Short Review of Colloid Theory (H. D. 

 Murray)— The Thyroid Gland (R. K. S. Lim, M.B., Ch.B.). p. 212 



POPULAR SCIENCE: The Cycles and Super-Cycles of Nature 

 (AV. E. Reynolds, M.D.). p. 250 



CORRESPONDENCE : An International Langruagre (A. J. Smith) 

 —Coincidence or Confirmation? A Discovery relating to 

 Drayson's Centre of Polar Motion (A. H. Barley)— The Date 

 of the Last Ice Age (R. A. Marriott). p. 265 



NOTES: The British Science Guild— National Physical Labora- 

 tory—The Sister of Science— Leplay House— P.R. Reform of 

 Learned Societies- Do English People Read?— Notes and 

 News -and other Notes. p. 278 



ESSAYS: Causality and Memory in Lossky's Epistemology 

 (J. C. Gregory, B.Sc.)— Recent AVork on the Influence of the 

 Ductless Glands upon Amphibean Metamorphosis (L. T. 

 Hogben, M.A., B.Sc.)— Verifiable Knowledge (G. Shann). p. 298 



REVIEWS: Plane Curves— DifTerential Equations— Space, Time, 

 and Gravitation— Relativity -Histoire de la Chimie- Chemistry 

 in Everyday Life— New Zealand Plants- Life and Work of 

 Sir Jagadis C. Bose— Hydration and Growth- Physiolog^r of 

 Fapm Animals— Altitude and Health- Physiology of Vision - 

 Ppinciples of Aepogpaphy- Food Inspection- Aipcpaft in Peace 

 —Aviation— Aeroplane Design- Thermodynamics for Engineers 

 — Aerodynamics — Airplane Photography — The Falkland 

 Islands— The Rising Tide of Colour-and other Reviews. 



p. 310 



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. 



Price 6/' »<?/, by post 6/5 Annual Subscription £1 4s, Od.y 



by post £1 5s, 6d, 



VOL. XV 



