SCIENCE-ADVERTISEMENTS 



THE 

 PRINCIPLES OF 

 STRATIGRAPHY 



BY 

 AMADEU3 W. GFIABAU, S.M.. S.D. 



PROFESSOR OF PALEONTOLOGY IN 

 COLUMBIA UNIVERSITY 



"Should be on the reference shelf of every col- 

 lege, normal school, and large high school in the 

 United States." — Journal of Geography, Vol. Xlil. | 

 Jan. 1915. 



8vo, 11 SO pages, 264 illattratiom. Prict, $T.SO 



Dascriptivo Circular Sent upon Request 



A. G. SEILER & CO. 



NEW YORK CITY 



NORTON'S ELEMENTS OF 



GEOLOGY 



One of the standard elementary textbooks in 

 the subject 



BECAUSE 



It keeps before the student's mind the evolu- 

 tionary nature of geologic processes. 



It gives a clear, simple, logical treatment of the 

 elements. Irrelevant material is omitted. 



It makes no artificial separation between dyna- 

 mic and structural geology. 



It provides an abundance of problems for stu- 

 dent solution, including many exercises in 

 reading geologic history from the records left 

 in land forms and rock structures 



Parts I and II deal with geological processes, 

 external and internal; Part III with historical 

 geology. 



462 panes. iUustrated, $1.40 



GINN AND COMPANY 



Boston 

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 San Francii 



The Philippine 

 Journal of Science 



ALVIN J. COX, M.A., Ph.D., General Editor 



Published by the Bureau of Science 



of the Government of the 



Philippine Islands 



A Periodical Devoted to the Scientific and Coinniercial 

 Interests of the Tropics 



The Journal, now in its twelfth volume, is issued in four 

 sections. Each section consists of sis nunabers a year,^ in 

 separately paged and indexed, and is a complete publication 

 in itself. 



YEARLY SUBSCRIPTION RATES 



Section A. Chemical and Geological Sciences and 



the Industries $2.00 



Section B. Tropical Medici-.e 3.00 



Section C. Botany 2.00 



Section D. General Biology, Ethnology and Anthro- 

 pology 2.00 



The four sections to one subscriber 7.00 



A complete list of the publications of the Philippine Bureau 

 of Science and a sample copy of the PhiUppine Journal of 

 Science will be sent upon request. 



Subscriptions and orders for publications should be sent to 



THE BUSINESS MANAGER 



Philippine Journal of Science 

 Bureau of Science MANILA, P. I. 



The Microscope 



12th Edition, Published April 10, 1917 



Re-Written and largely Re-Illustrated 



By SIMON HENRY GAGE of Cornell UnWerelty 



Postpaid $3.00 



COMSTOCK PUBLISHING CO., Ithaca, N. Y. 



Memoirs of the Wistar Institute of Anatomy and 

 Biology. No. 6, 1915 



THE RAT 



Data and Reference Tables , 278 Pages. 89 Tables. 



Biblio raphy. 

 Compiled and Edited by HENRY H. DONALDSON. 



Postpaid $3.00. 



Philadelphia, Pa. 



The Wistar Institute 



The Ellen Richards Research Prize 



The Naples TaLIe Association for Promoting 

 Laboratory Research by Women announces the offer 

 of a research prize of $1000.00 for the best thesis 

 written by an American woman embodying new ob- 

 servations and new conclusions based on independent 

 laboratory research in Biology (including Psy- 

 chology), Chemistry or Physics. Papers published 

 before 1916 will not be considered and theses pre- 

 sented for a Ph.D. degree are not eUgible. Theses 

 offered in competition must be in the hands of the 

 Chairman of the Committee on the Prize before 

 February 25, 1918. Apphcation blanks may be ob- 

 tained from the secretary, Mrs. Ada Wing Mead, 

 823 Wayland Avenue, Providence, R. I. 



