SCIENCE PROGRESS 



IN THE TWENTIETH CENTURY 



A QUARTERLY JOURNAL OF 

 SCIENTIFIC WORK AND THOUGHT 



NO. 39. JANUARY 19 16 



COlTENT'o 



1. Colour and Chemical Str* : .lure. S. C. Bradford, E.Sc, The 



Science Museum, Sout Kensington, London 



2. On the Liesegang Phenomenon in Gels. S. C. Bradford, B.Sc, 



The Science Museum.. South Kensington, London 



3. The Iron-Bacteria. David Ellis, Ph.D., D.Sc, F.R.S.E., Royal 



Technical College, Glasgow 



4. The Solution of Equations by Operative Division. Part .!«?. 



Sir Ronald Ross, K.C.B., F.R.S., D.Sc. 



5. The Influence of Research on the Development of the Coal- 



Tar Dye Industry. Part II. F. A. Mason, B.A., Ph.D., Royal 

 College of Science, South Kensington, London 



6. Essay-Reviews : A New Aid to Mathematical Knowledge (C). 



The Insect and the Hermit (C. H. O'Donoghue) 



7. Recent Advances in Science : Mathematics (P. E. B. Jourdain) 



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

 Chemistry (C. S. Garrett)— Organic Chemistry (P. Haas) 

 —Geology (G. W. Tyrrell) -Botany (F. Cavers)— Zoology 

 (C. H. O'Donoghue)- Anthropology (A. G. Thacker) 



8. Notes : The British Association— Government and Chemistry 



—Government Grants for Scientific Research- Sir Edwin 

 Durning-Lawrence — Mr. Man-in-the-Mass — The k Cash 

 Value of Scientific Research— and other Notes 



9. Correspondence: Logic -a Rejoinder to a Rejoinder (W. H. 



Winter). Symtaiogenesis (H. Reinheimer) 

 10. Reviews: A Treatise on the Analytic Geometry of Three 

 Dimensions— The Theory of Proportion— John Napier and 

 the Invention of Logarithms— The British Coal-Tar In- 

 dustry—The Mutation Factor in Evolution-The Spirit of 

 the Soil— Emma Darwin -and Twenty-three other Reviews 



EDITOR 



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

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



LONDON 

 JOHN MURRAY, ALBEMARLE STREET, W. 



Price 5/- net 

 VOL. x 



