SCIENCE-ADVERTISEMENTS 



THE 

 PRINCIPLES OF 

 STRATIGRAPHY 



BY 



AMADEUS W. GRABAU. 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."— /ourna/ of Geography, Vol. XIII, 

 Jan. 1915. 



8vo. IISO pages, 264 illaalrationt. Price, $7. SO 



Deicriptivo Circular Sent upon Request 



A. G. SEILER & CO. 



NEW YORK CITY 



HOLDING AN ASSURED PLACE 



AMONG 



SUCCESSFUL COLLEGE TEXTBOOKS 



McPherson and Henderson's 



General Chemistry 



WHY ? Because it reflects the practical 



and utilitarian in modem science 

 teaching. 



Because it correlates scientific 

 fact with actual commercial processes. 



Because it humanizes abstrac- 

 tions through historical references. 



Are you familiar with McPherson 



and Henderson: General Chemistry, $2.25 



Laboratory Manual to Accompany, 0.60 



Ginn and Company 



Boston New York Chicago London 

 Atlanta Dallas Columbus San Francisco 



A New Scienti£c Series 



HARYHRD HFRieHN STUDIES 



©. BaTES, M.a., F.R.G.S., Editor 



F. H. STERNS, Ph.D., assistant Editor 



The African Department of the Peabody Musem of Harvard University announces a new scien- 

 tific series devoted to the study of the African archaeology and anthropology in the widest sense, and 

 to the scientific phases of the negro problem in America. The series will consist of annual volumes of 

 short papers, and occasional monographs. 



The editors wiU welcome contributions giving the result of original studies within the scope of the 

 series. Although planned to afford a medium of publication for African studies in America, and to en- 

 courage such researches, the volumes are open to all investigators. 



Now Ready, Volume I 



vaRia aPRieaiva i 



zt^+292 pp., 8 X SO t-2 ins., 30 helioiypepls., 30 photolith pis-, figs, in text. 

 Cloth, $10.00, post free 



Includes papers on African folk-lore, ancient Egyptian surgery, the paleolithic period, the Canary Islands, 

 Benin, Darfur, ancient Egyptian fishing, etc., with a bibliography of Africana for 1915. 



Copies may be obtamed from the ASSISTANT EDITOR, H. A. S., Dept. C, PeabodylMuseum, 

 Cambridge, Massachusetts. 



