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The Concepts and Theories of Modern Physics. 



The Concepts and Theories of Modern Physics. By J. B. Stallo. "International Scientific Series." 

 i2mo, cloth. $1.75. 



"Judge Stallo's work is an inquiry into the validity of those mechaivcal conceptions of the universe which are 

 now held as fundamental in physical sc ence. He takes up the leading modern doctrines which are based upon 

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 jointly exhibited in a scientific treatise." — N. Y. Sun, 



A Treatise on Chemistry. 



A Treatise on Chemistry. By H. E. Koscoe, F. R. S., and C. Schori.emmer, F. R. S., Professors of 

 Chemistry in the Victoria University, Owens College, Manchester. Volume III. — The Chemistry of the 

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 "The authors are evidently bent on making their books the finest systematic treatise on modern chemistry 

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Adolph Strecker's Short Text Book of Organic Chemistry. 



Adolph Strecker's Short Text Book of Organic Chemistry. By Dr. Johannes Wislicenus. 



Translated and edited, with extensive additions, by W. H. HoDGKlNSON, Ph. D., and A. J. Greenaway, F. I. C. 



8vo, cloth, pages 790. Price, $5.00. 

 The great popularity which Professor Wislicenus's edition of " Strecker's Text-book of Organic Chemistry " 

 has enjoyed in Germany has led to the belief that an English translation will be acceptable. Since the publi- 

 cation of the book in Germany the knowledge of organic chemistry has increased, and that has necessitated many 

 additions and alterations on the part of the translators. 



D. APPLETON & CO , Publishers, 1, 3 a nd 5 Bond Street, New York. 

 International Scientists' Directory. 



THE INTERNATIONAL SCIENTISTS' DIRECTORY for 

 1881-2, contains the names and addresses of from 15,000 to 20,000 

 Scientific men and amateurs in all parts of the world, together with 

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This is the first work of its kind ever attempted, and it will be 

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 on receipt of price. S. E. CASSINO, Publisher, 



32 Hawley Street. Boston, Mass. 



SCIENCE 



A WEEKLY JOURNAL OF SCIENTIFIC PROGRESS. 



Vol. Ill, No. 81 , - January 21, 1882. 



CONTENTS. 



Standard Time ; New York Academy of Sciences, December 19th, 1881 ; Microscopical 

 Society of Illinois ; The American Chemical Society ; Suicide; An Essay on Com- 

 parative Moral Statistics; The Sun, by Professor C. A. Young; Steam and 

 Hydraulic Safety Elevators; Oxidized Oil; Correspondence; Books Received; 

 Luminous Intensity of the Voltaic Arc; Notes, &c, &c, 



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