





»>, i>^'\ 



SCIENCE PROGRESS 



A QUARTERLY REVIEW OF 

 SCIENTIFIC THOUGHT, WORK & AFFAIRS 



No. 55. JANUARY 1920 



CONTENTS 



RECENT ADVANCES IN SCIENCE': Pure Mathematics (D. 

 Wrinch)— Astronomy (H. S. Jones) -Physical Chemistry (Prof. 

 W. C. McC. Lewis, D.Sc.)— Organic Chemistry (P. Haas, D.So.) 

 —Geology (G. W. Tyrrell)— Mineralogy and Crystallography 

 (A. Scott, D.Se.)-Botany (E.J.Salisbury, D.Sc.)— Plant Physi- 

 ology (Prof. W. Stiles) -Palseobotany (M. C. Stopes, D.Sc.)— 

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

 Thacker). p. 361 



ARTICLES : Evolution and Irreversibility (Alfred J. Lotka, M.A., 

 D.Sc.)— Rhythm in Nature (F. W. Flattely). p. 406 



POPULAR SCIENCE : Some Scientific Aspects of Cold Storage, 

 Part III (Ingvar Jorgensen, Cand. Phil., D.I.C., and Prof. 

 Walter Stiles, M.A.). p. 427 



CORRESPONDENCE: Latin or Ido? (Gilbert H. Richardson) 

 —The Ghost- Hypothesis (I, C. A. Richardson; II, A Plain 

 Statement ; III, Neyil Maskelyne). p. 435 



NOTES: Charles Arthur Mereier— Philip Edward Bertrand 

 Jourdain (A. E. Heath)-Sir Oliver Lodge and Einstein's Theory 

 (H. S, J.) — Einstein on his Theory (H. S. J.) — The Solar 

 Eclipse Expeditions and their Result (G. B. J.)— The British 

 Association (Prof. A. O. Rankine) — Experimental Farming 

 (G. W. Harris) -Notes and News— and other Notes. p. 446 



ESSAYS : Methods in Psychology (Arthur Lynch, M.A., L.R.C.P.) 

 -Dalton's Debt to Democritus (J. C. Gregory, B.Sc, F.I.C.)— 

 Politics and Science (F. H. Perrycoste, B.Sc). p. 472 



REVIEWS: History of the Theory of Numbers— Matrices and 

 Determinoids — Hydrogen — Fats and Fatty Degeneration- 

 Physical Chemistry of the Proteins -Military Geology— Science 

 and Fruit Growing- Vegetable Growing-Strawberry Growing 

 -Sugar-Beet in America- Cacti- World Power and Evolution 

 —The Human Skeleton— Machine Design— Irrigation Engineer- 

 ing-Applied Mechanics— A Century of Science in America- 

 Natural Knowledge-and other Reviews. p. 497 



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. BRONT£ GATENBY, B.A., B.Sc. 



LONDON : JOHN MURRAY, ALBEMARLE STREET, W. 



Price 6j- net 



VOL. XIV 



