The Study of Stellar Evolution 



An Account of Some Modern Methods of Astrophysical Repenrch 

 By GEORGE ELLERY HALE 

 The introduction of photographic methods, the improvement ol t. l< h (>].<•*, and 

 the rapidly increasing appreciation of the value to astronomy of physical instruments 

 and processes, have revolutionized the observatory. From a simple ol>H-rvin<r 

 station it has been transformed into a great physical laboratory, where images of 

 the sun and stars are studied with many powerful instruments, and celestial pheno 

 mena are experimentally imitated with the aid of electric furnaces and other sources 

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

 development, and decay of stars. This books 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 phases. 



250 pages, 10 % plates, 8vo, cloth; net 04.00, postpaid $£.27 

 Address Dept. 62 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO NEW YORK 



ESSAYS PHILOSOPHICAL AND PSYCHOLOGICAL. 



IN HONOR OF WILLIAM JAMES. PROFESSOR IN HARVARD UNIVERSITY 



BY HIS COLLEAGUES AT COLUMBIA UNIVERSITY memQnhleMrv 

 in phuH^fw? p^vchotog^ ^i^SJ^h^KiIddS^ThJ^tudie^^the encouragement that 

 flowed from him to colleagues without number. From Prefatory Note. 



The New Realism .?!??^™ George Stuart Fuixerton 



Votm Keaiity possess Practical Character? ••' V 



A Factor in the Genesis of Idealism ■ • • • • Wendell T. tsvss 



Consciousness a Form of Energy Wm. Peppebbell Montauue 



Perception and Epistemology Frederick J. E. Woodbbidge 



Subetitutionalism • • • - C - A - t ? KONO 



World-Pictures Walter Bouqhtoh Pitkin 



Naive Realism : What Is It?.'.' .'.'.'.'. . .'." Dickiksok S. Mixi.eb 



Kant and the English Platonisti AbthcR O Lovfjoy 



A Critique of Kant's Ethics Fixrr A T DUEB 



The Abuse of Abstraction in Ethics Hebbebt Gardiner Lord 



Purposive Consistency, the Outline of a Classification of Values •• ■ A - A £™™3 



The Problem of Method in Mathematics and Philosophy Harold Chapman Brows 



Kate Gordon 



E S Woodwobth 



Psychological Essays. 



3 of Relation, 

 untne Variability o" 

 The Validity of Ju. 



f£te for' FreeWili' '.WWW 



I Perception ..V \\\\\ _ James McKeek C 



With Photograph of Professor Jams*. 



LONGMANS, GREEN & COMPANY. 91 Fifth Avenue, New York City 



