SCIENCB—'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." — Journal of Geography, Vol. XIII. 

 Jan. 1915. 



See, USO pagei, 264 illuttrationt. Price, $7. SO 



Deacriptiv* Circular Sent upon Requeat 



k. G. SEILER & CO. 



NEW YORK CITY 



The Microscope 



I2th Edition, Published April 10, 1917 



Re-Written and largely Re-IUustrated 



By SIMON HENRY GAGE of Cornell UniTeraity 



Postpaid $3.00 



CX3MSTOCK PUBLISHING CO., Ithaca, N. Y. 



Memoirs ef 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. 



The Wistar Institute Philadelphia, Pa. 



The Ellen Richards Research Prize 



The Naples Table 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 eligible. 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. 



Fascinating Jungle Studies of Jungle Life 



IN BRITISH GUIANA 



Bein^ Zoolosical Contributions to science, from the Tropical Research 

 Station of the New York Zoological Society, at Kalacoon, 1916 



By William Beebb, G. Innbss Haktley and Paul G. Howes, with an introduction by 

 Colonel Theodore Roosevelt 



Octavo, clotEi. ^It top and side stamp, 504 pa^es, 4 colored plates and 140 other illustrations 



This remarkable volume sets an entirely new pace in the study of wild hfe. The three 

 naturalist authors went to a South American jungle that was teeming with animal life, lived there 

 under most advantageous conditions, and for several months indulged in a genuine orgy of observa- 

 tions and studies of tropical wild Ufe as that life was lived and developed from day to day. The key- 

 note was the evolution and development of interesting and little known forms. 



The studies so beautifully revealed in this fascinating volume embrace such bird species as 

 the wonderful tree-climbing hoatzin, various toucans, tinamou, jacanas, Emis, nighthawks, fly- 

 catchers, antbirds and memy others. The reptiles were the giant marine toad, the deadly bush- 

 master, and alligators ; and great work was done among the wasps. 



The volume tells the whole story of the Research Station, its work and surroundings. It 

 shows how it will expsmd in the future, offering splendid opportunities for investigation to pro- 

 fessors, students and nature lovers. As a vivid exposition of tropical life in a rich South American 

 jungle, it is unique and unrivalled. The wealth of skillfully made photographs, colored plates, 

 maps and diagrsuns, brings the whole of the subject matter into the reader's grasp. 



Only 500 copies are available for sale outside the Society. 



Price $3.00 net. Average of postage 15 cents extra. Special price to all members of the New 

 York Zoological Society $2.00 net, postage 8 cents extra. 



Remit to H. RAYMOND MITCHELL, Chief Clerk, New York Zoological Park, 

 New York City. 



