SCIENCE-ADVERTISEMENTS 



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Biographical Directory of American Men of Science 



THIRD EDITION 



The new edition of the Biographical Directory of American 

 Men of Science, which has been delayed by war conditions, is now in 

 course of preparation under the editorship of J. McKeen Cattell, Garrison, 

 N. Y. Corrections to the entries in the second edition should be sent to 

 him. Those in America, who have worked in the natural and exact sciences, 

 but who are not included in the second edition, are requested to send the 

 following information (preferably typewritten) : 



Full name with title and mail address, the part of the name ordinarily omitted in correspondence 

 being in parentheses— e.g.. Prof. J(ohu) W(ilson) Smith, 1234 Lincoln St., Washington, D. C. 



Department of investigation. 



Place and date of birth. 



Education and degrees, including honorary degrees, with dates. 



Positions with dates at which they were held. 



Temporary or minor positions and honors, such as lectureships, trusteeships, scientific expeditions, 

 prizes, medals, etc. 



Membership in scientific societies and offices with dates at which they were held. 



Chief subjects in which research work has been published and is now in progress. 



THE SOIEINCB PRESS 



LANCASTER, PA. 



QARRISON, N. Y. 



NEW YORK, N. Y. 



