TEACHERS AGREE 



that the 



MclNTOSH COLLEGE BENCH LANTERN 



is adapted to more lines of SCIENTIFIC 

 PROJECTION than any other instrument. 

 Is simple in construction and sold at t 

 low price. Write for particulars 



EOPTICON COMPANY 



CHICAGO, ILL 



The Life History of PolysipHoiaia Violacea 



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



yi pages, 10 plates, 8vo, paper, net $1.00, postpaid $1.05 



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

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

 the mitosis in germinating tetraspores and carpospores, and in the vegetative cells of mature plan ' 

 then comes an account of spermatogenesis, formation of procarp, fertilization, and developmen 

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

 malities; finally there is a discussion of the cytological phenomena and alternation of general 



ADDRESS D 



THE UNIVERSITY OF 



New Yor* 



By Albert A. Michelson 



Wave Motion and Interference. 



Comparison of the Efficiency of the Micro- 

 scope, Telescope, and Interferometer. 



Application of Interference Methods to 

 Measurements of Distances and Angles. 



Application of Interference Methods 

 Spectroscopy. 



«• 



Analysis of the Actio* ••«$£& * 

 Light Waves by the Interred 



the Echelon. . - tt 



Application of Interference »«»» 



Astronomy. 

 The Ether. 



With 108 text figures and three full-page lithographs. 



:il„«,!l , ; mer0US J pr f Ctical applications of recent theories in optics together with tccjj e 

 S»H^ IOn ? a k nd . descri P<i°ns of apparatus add materially to the value °* "£ ^ 

 lh»t?r S J P 5v 1CS and astronom y w »l find here an admirable condensation otto, 

 what scattered literature of the subject, presented in an original and enterta.n.ng »"- 



*1 



$1 



University of Chicago Vt &* 



Chicago and New YorK 



