SCIENCE— ADVERTISEMENTS 



THE 

 PRINCIPLES OF 



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 illaitrationt. Price, $7.50 



Oeacriptivc 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 paoes, iUustfated, $1.40 



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UNIVERSITY OF CALIFORNIA 

 PUBUCATIONS 



The University of CaUfornia issues publieatfons in the 

 following aeries amng othersi 



\griouItural Science Mathematics 



American Archeology Pathology 



and Ethnology Philosophy 



Botany Physiology 



Economics Psychology 



Geology Zoology 

 Memoirs of the University of California 



Bulletin and Publications of the Uck Observatory 



RECEPO* TITLES 



Ceremonies of the Porno Indiana, by S. A. Barrett 45 



Porno Bear Doctors, by S. A. Barrett 25 



The Position of Yana in the Yokan Stock, by Edward 



Sapir 35 



Aphididae of California. New Species of Aphididae and 

 Notes from Various Parts of the State, but chiefly 

 from the Campiis of the University of California, 

 by E. O. Essig 45 



Asoidians of the Littoral Zone of Southern California, 



by W. E. Ritter and Ruth A. Forsyth 1.00 



A Distributional List of the Amphibians and Reptiles of 



CaHfomia, by Joseph Grinnell and Charles L. Camp .85 



Complete list of titles and prices will be sent 

 on application 



THE DNiVERSITr PRESS . . • Beritticf, CaBfornia 



Publications of 

 Carnegie institution of Wastiington 



The publications of the Institution now number over 300 

 volumes, the subjects including Anatomy, ArchcBology, Astron- 

 omy, Botany, Chemistry, Economics and Sociology, Embry- 

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[33. Parkhurst, J. A. Researches in Stellar Photometry. 



Quarto, 192 pages, 13 plates, 39,text figures .... 1^2.00 



119. Perrine, C. D. Determination of the Solar Parallax 

 from Photographs of Eros made with the Crossley 

 Reflector of the Lick Observatory. Quarto, v+98 

 pages, 1 plate, 2 test figures . . S2,50 



147. Russell, H. N. Determinations of Stellar Parallax, 

 based upon photographs taken at the Cambridge 

 Observatory, with Magnitudes and Spectra deter- 

 mined at Harvard College Observatory. Quarto, 



vi +142 pages §2.00 



43. Peters, C. H. F. Heliographic Positions of Sun- ^^^ 

 Spots, observed at Hamilton College from 1860 to 

 1870. (Edited bv E. B. Frost.) Quarto, xin-f- 



189 pages [S2.50 



86, Peters, C. H. F., and E. B. Knobel. Ptolemy's ""^ 

 Catalogue of Stars. A Revision of the Almagest 

 Quarto, 111+207 pages ^S3.50 



RECENTLY ISSUED " 



2oO.'Knobel, E. B. Ulugh Beg's Catalogue of Stars, re-^^^^ 



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