SCIENCE PROGRESS 



A QUARTERLY REVIEW OF 

 SCIENTIFIC THOUGHT, WORft^ AFFAIRS 



No. 50. OCTOBER 191 8 

 CONTENTS 



RECENT ADVANCES IN SCIENCE: Philosophy (H. Elliot- 

 Mathematics (P. E. B. Jourdain)— Applied Mathematics (S. 

 Brodetsky)— Astronomy (H. S. Jones)— Physics (J. Rice)— 

 Physical Chemistry (Prof. W. C. McC. Lewis, D.Sc.)— Organic 

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

 (E. J. Salisbury, D.Se.)-Plant Physiology (I. Jorgensen)— 

 Paleobotany (M. C. Stopes, D.Sc.) — Zoology (Prof. C. H. 

 CDonoghue, D Sc.)— Anthropology (A. G. Thaoker)— Paleon- 

 tology (W. P. Pyeraft). 



ARTICLES: The 100-inch Reflecting Telescope of the Mount 

 Wilson Solar Observatory (H. Spencer Jones, M.A., B.Se.) — 

 Some Aspects of Animal Colouration from the Point of View 

 of Colour Vision. Part II. (J. C. Mottram, M.B., and F. W. 

 Edridge Green, M.D., F.R.C.S.). 



POPULAR SCIENCE : The Preservation of Game-Birds and its 

 Relation to Agriculture (Walter E. Collinge, D.Sc, F.L.S.). 



CORRESPONDENCE : A Correction (J. Reid Moir). 



NOTES: William II. (C. Mereier, M.D., F.R.C.P.)-The Sheffield 

 Institution of Metallurgists (W. H. Hatfield, D.Met.)— Notes 

 and News (D. Orson Wood, M.Sc). 



ESSAYS: Operative Algebra (Col. Sir Ronald Ross)— Problems 

 of Arrangement of an Infinite Class (P. E. B. Jourdain, 

 M.A.)— Vitalism or Mechanism 9 (J. E. Turner)— The Denuda- 

 tion of the Weald (H. Bury, F.G.S.). 



ESS AY-RE VIE WS: Sir W. Ramsay (F. A. Mason). 



REVIEWS: Analytic Geometry and Calculus— Arsenic and An- 

 timony—Edible Oils and Fats- Intermediate Products for Dyes 

 —The Potato— Rothamsted Experiments— Evolution of Life— 

 Megalithic Culture of Idonesia— Primitive Man- Gunnery- 

 Training of Chemical Engineers — Tidal Lands — and other 

 Reviews. 



EDITOR 



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

 D.Sc, LL.D., M.D., F.R.C.S. 



LONDON : JOHN MURRAY, ALBEMARLE STREET, W. 



Price 51- net 



VOL. XIII 



