SCIENCE 



A WEEKLY JOURNAL DEVOTED TO THE ADVANCEMENT OF SCIENCE, PUBLISHING THE 



OFFICIAL NOTICES AND PROCEEDINGS OF THE AMERICAN ASSOCIATION 



FOR THE ADVANCEMENT OF SCIENCE. 



EditoeIjIL Committee : S. Nbwcomb, Mathematics ; R. S. Woodward, Mechanics ; E. C. Pickeeing, 

 Astronomy ; T. C Mendenhall, Physics ; E. H. Thurston, Engineering ; Ira Remsen, Chemistry ; 

 Charles D. Walcott, Geology ; W. M. Davis, Physiography ; Henry F. Osborn, Paleon- 

 tology ; W. K. Brooks, C. Haet Merriam, Zoology ; S. H. Scudder, Entomology ; C. E. 

 Bessey, N. I,. Beition, Botany ; C. S. Minot, Embryology, Histology ; H. P. Bow- 

 DITCH, Physiology ; J. S. Billings, Hygiene ; William H. Welch, Pathol- 

 ogy ; J. McKeen Cattell, Psychology ; J. W. Powell, Anthropology. 



Friday, January 31, 1902. 



CO'NTEIJTS: 



The Development of Chemistry: Professor 

 P. W. Clarke 161 



Graded Condensation in Benzine Vapor: 

 Professor Cakl Barus 175 



Data on Song in Birds: William E. D. 

 Scott 178 



Uusetim Study by Chicago Public Schools: 

 Oliver C. Faeeington 181 



The Boundary Line ietiveen Texas and 'New 

 Mexico 184 



Scientific Books: — 



Biologia Centrali-Americana : De. W. J. 

 Holland. Gorham's Bacteriology : Haven 

 Metcaxf 186 



Societies and Academies: — 



The Geological Society of Washington: 

 Alfred H. Brooks. Biological Society of 

 Washington: F. A. Lucas. The Philo- 

 sophical Society of Washington: Charles 

 K. Wead. The Neio York Academy of Sci- 

 ences, Section of Biology: De. H. E. 

 Ceampton. The Boston Society of Natural 

 History: Glover M. Allen. The Kansas 

 Academy of Science: D. E. Lantz. TTig 

 Academy of Science of St. Louis: Peo- 

 FESSOR William Trelease 189 



Discussio7i and Correspondence: — 



An American Geographical Society: Pro- 

 fessor Israel C. Russell 195 



The International Centralblatt for Botany.. 196 



Scientific Notes and News 197 



University and Educational News 199 



MSS. intended for publication and books, etc., intended 

 for review should be sent to the responsible editor. Pro- 

 fessor J.^McKeen Cattell, Gsrrison-on-Hudson, N. Y. 



THE DEVELOPMENT OF CHEMISTRY.* 



The American Chemical Society exists 

 for the advancement of chemical science, 

 and the betterment of the chemical pro- 

 fession. Every member of it is supposed 

 to contribute his share of thought and 

 energy to the accomplishment of these 

 ends; and so its work is prosecuted along 

 many lines of activity. During the past 

 ten years the growth of the Society has 

 been most remarkable, and the diversity of 

 its interests is well sho-mi in the pages of 

 its Journal. The once doubtful experi- 

 ment of organization has justified itself by 

 success, and there are no longer any appre- 

 hensions as to the future. The Society 

 now stands before the world well estab- 

 lished, well recognized, active and vigor- 

 ous; its days of weakness and danger are 

 over; we can look forward with confidence 

 to greater prosperity, to larger groAvth, to 

 steadily increasing usefulness. All chem- 

 istry is our province, whether it be organic, 

 inorganic, theoretical, physical or applied; 

 and the narrovraess of specialism finds its 

 best antidote in the varied interests of our 

 meetings. To promote science and to up- 

 hold the dignity of our common profession 

 are the objects which bind us together. 



Optimism is a good thing, but it needs to 



* Presidential address delivered at the Philadel- 

 phia meeting of the American Chemical Society, 

 December 30, 1901. 



