New Series p September, 8, 1922 Annum. Sdbscripti^ $6.00 



VOL. LVI, No. 1445 ' ' ' Single Copies, 15 Crs. 



Philosophy and the New Physics 



The Relati-'-ity Theory and the Theory of Quanta. By Prof. Louis 

 RouGiER (Paris). Translated by Prof. Morton Masius (Worcester). 

 Cloth, $1.75. 



"It is remarkably free from those long mathematical proofs which are 

 such effective stum'bling blocks to most readers."- — Drug and Chemical 

 Markets. 



"M. Rougier writes as only a master can. The translation is so well done 

 that it would be difficult to distinguish from an original English work." 

 — The Scientific Australian. 



Introduction to General Chemistry 



The Principles of Chemistry as Recognized To-day by the Leaders of 

 the Science. 30 Illustrations. Cloth, $2.00. By Prof. H. Copaux 

 (Paris). Translated by Henry Leffmann, M.D. (Philadelphia). 



Besides presenting the older fundamentals laws and theories of chem- 

 istry, the book discusses the modern topics, such as radioactivity, struc- 

 ture of the atom, the phase rule, etc. A short appendix dealing with 

 hydrogen-ion concentration has been contributed by the translator. 



The Theory of Heat Radiation 



The Quantum of Action. By Prof. Max Planck (Berlin).'" Trans- 

 lated by Prof. Morton Masius (Worcester). Illustrations. Cloth, $3.00. 



"Planck gives a very clear exposition of his hypothesis of the 'quantum 

 of action" which has exerted a very profound influence on the recent 

 developments of theoretical physics. The translator has increased its 

 usefulness by adding foot-notes, an appendix, and a commentated list 

 of general papers which treat of the application of the theory of quanta 

 to different l-''-^rirhes of physics." — American Journal of Science. 



R BLAiaSTON'S SON & CO. 



PUBLISHERS 1012 Walnut Street PHILADELPHIA 



