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3 1 45 W. RANDOLPH ST.. CHICAGO 



1 



Botanical Apparatus and Supplies 



for Morphology, Physiology, Ecology 



SPECIALTIES 



Potometer, Clinostats, Auxometer, Wardian 



Cases, Clement's Photometer, Etc. 



* 



Lectures on the Calculus of 



- Variations 



I 



By OSKAR BOLZA, Ph.D. 



Of the Department of Mathematics in 



University of Chicago 



the 



S4-00, Piet: $4,16^ postpaid 



The University of Chicago Press 



CHICAGO and 156 Fifth Avenue NEW YORK 





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For showing oti the screen opaque objects, book 

 illustrations, eug^ravin^s, and lantern slides. 

 It is the most perfect instrument of its kind. 

 It has a detachable Book-Holder. 

 It concentrates all liglit ou the object. 

 It shows priuted matter correctly. 



Direct Vision Spectroscopes 

 Diffraction Gratings 



E^specially arrang^ed for educational use. Wc 

 can import these duty free at extremely low prices. 



Wireiess Telegraplt Outfits 



For school room and experimental work. Com- 

 plete seudiug and receiving stations. 



Lantern Slides— Microscopic Slides 



Illustrating Botany. Geology and other sci 



Lists on application. 



WILLIAMS, BROWN & EARLE, 



Dept. 24, 918 Chestnut Street, Philadelphia, 



ITALIAN BOOKS 



of every description 



FRANCESCO TOCCI. 520 Broadway. 



NEW YORK. 



Works of: Barrili, Butti. Caccianiga. Capra- 

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 always on hand. 



Catalogue mailed on application. 



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TKe Life History of PolysipHonia Violacea 



By SHIGEO YAMANOUCHI, Fellow in Botany in the University of Chicago 



54 pages, 10 plates, 8vo, paper, net $i.oo, postpaid $1.05 



Various authors have published accounts of investigations on the red algae, but the true life-history 

 of the group has never been given. This paper presents first the results of the author's studies of 

 the mitosis in germinating tetraspores and carpospores. and in the vegetative cells of mature plants; 

 then comes an account of spermatogenesis, formation of procarp. fertilization, and development of 

 the cystocarp; tetraspore formation is next considered, followed by a description of certain abnor- 

 inalities; finally there is a discussion of the cytological phenomena and alternation of generations. 



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CHicago THE UNIVERSITY OF CHICAGO PRESS N*>w Yorlc 



