The Study of 



Stellar Evolution 



An Account of Some Modern Methods of 

 Astrophysical Kesearch 



By GEORGE ELLERY HALE 



The introduction of photographic methods, the improvement of telescopes, and the rapidly in- 

 creasing appreciation of the value to astronomy of physical instruments and processes, have revolu- 

 tionized the observatory. From a simple observing station it has been transformed into a great 



and celestial phenomena are experimentally imitated with the aid of eleetric furnaces and other 

 sources of intense heat. The result has been a great gain in our knowledge of the origin, develop- 

 ment, and decay of stare. This book explains in a popular way how the life histories of the sun and 

 stars are investigated. One hundred and four half-tone plates, made from the best astronomical 

 negatives, place before the reader the most recent results of celestial photography in most of its 



250 pages, 104. plates, 8vo, cloth, net $^.00, postpaid $4.27. 



By CHARLES J. CHAMBERLAIN, Ph.D. 

 of the Department of Botany in the 



University of Chicago 

 Second Edition, Illustrated. 

 AN INDISPENSABLE BOOK 

 FOR STUDENTS OF BOTANY 

 rpniS BOOK contains 



ANIMAL MICROLOGY 



PRACTICAL EXERCISES IN 

 MICROSCOPICAL METHODS 



By MICHAEL F. GUYER 



An indispensable book for teach Jj^*^ 



1 ^ j n S ^• n9 *? l n!!^i* "theoretical 



nlarged from 168 to 272 pages. 



Address Dept. 62 

 The University of Chicago Press, Chicago and New 



