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 shell of every col- 

 lege, norma] school, and large high school in the 

 United States." — Journal of Geography, Vol. XIII> 

 Jan. 1915. 



8oe, IISO page; 264 illattration: Pricm. $7. BO 



Descriptiv* Circular Sent upon Reqnett 



A. G. SEILER & CO. 



NEW YORK CITY 



GENERAL 

 ASTRONOMY 



By Charles A. Young 



Princeton University 



A clear, accurate, and justly proportioned 

 presentation of astronomical facts, principles, 

 and methods in such a form that they can be 

 easily apprehended by the average college 

 student, of whom only an elementary knowl- 

 edge of mathematics is required. At the end 

 of nearly every chapter is a set of illustrative 

 examples which give the student an opportu- 

 nity not only to review the work but also to 

 apply practically the knowledge gained. 



630 pages, aiustrated, $2.75 



GINN AND COMPANY 



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HHRYHRD HFRienN STUDIES 



A new series devoted to African anthropology in its widest 

 sense, and comprising annual volumes of short papers and 

 occasional monographs. 



Now read^, Volume I, xw + 292 pp., 30 heliot^pe ph., 

 30 photolith ph., man}) text figs., handsomely bound in Cloth 



Contains articles on ancient Egyptian fishing, Benin bronzes, 

 Egyptian archeology, Swahili didactic literature, etc. 

 Copies may be obtained by sending $10.00 to the Assistant 

 Editor, H. A. S. 



HFRieHN DEPARTMENT ©F THE PEHB0DY MUSEUM 



Harvard University Cambridge, Mass. 



