SCIENCE 



Nkw Series „ _ 1^1 noo Annual Subscbiption, $6.00 



Vol. LVI, No. 1437 J^ KIDAY, JULY 14, 1\)ZZ Single Copies, 15 Ors. 



Some Notable Biakiston Books 



DUFF. A Textbook of Physics 



Sth Revised Edition. 6og Illustrations. Cloth, $4.00. Prepared by collaboration of a num- 

 ber of Physicists ; Edited by A. Wilmer Duff, A. M., Sc.D., Professor of Physics, Wor- 

 cester Polytechnic Institute. 



"Taken as a whole, the parts of the book are well welded together, and, having as authors 

 specialists in the different departments, it ranks among the best college texts of the day." — 

 Science. 



PLANCK, Theory of Heat Radiation 



Illustrated. Cloth, $3.00. By Max Planck, Professor Mathematics and Physics, Berlin 

 University; Translated by Morton Masius, Ph.D., Worcester Polytechnic Institute. 



"Planck gives a very clear exposition of his hypothesis of the 'quantum of action,' wliich has 

 exerted a very profound influence on the recent developments of theoretical physics." — 

 American Journal of Science. 



ROIIGIER. Pliilosophy and the New Physics 



Cloth, $1.75. By Prof. Louis Rougier (Paris); Authorized Translation by Morton Masius, 

 Ph.D., Worcester Polytechnic Institute. 



"It is written in such language that the ordinary high school teacher of physics would be 

 able to understand. It is worthy of a large sale." — School Science and Mathematics. 



CHAMBERLAIN. Textbook of OrgankjGh^str^ 



Cloth, $4.00. By Joseph Scudder Chamberlain, Ph.D., Pro^f^ssor of Organic Chehjistry, 

 Massachusetts Agricultural College. 1 - '' \ 



"The book contains a very large amount of information.fiS^tll ^!yi);essdd'^n|Q\9^ arraf^ged." 

 — Henry Leffmann, in Journal of Franklin Institute. \ *" 



BROWN. History of Chemistry V ^nal \!i^^ ^^ 



2nd Revised Edition. 107 Illustrations. Cloth, $6.00. By J. Campbell Brown, D.Sc, LL.D., 

 Late Professor of Chemistry, University of Liverpool. 



From most ancient to modern times, based upon extensive research into original authorities 

 including many old and rare treatises. 



P. BLAKISTON'S SON & CO. Publishers: Philadelphia 



