THE PROGRESSIVE SCIENCE SERIES 





COMPARATIVE PHYSIOLOGY OF 

 THE BRAIN AND COMPARATIVE 



PSYCHOLOGY. By JACQUES LOEB, M.D., Pro 

 fessor of Physiology in the University of Chicago. With 

 Illustrations. 6s. net. 



. 



THE STARS. A Study of the Universe. By Profes 

 SIMON NEWCOMB. With Illustrations. 6s. net. 

 Professor Newcomb gives in this book a fascinating account of the wonder 

 ful advances of our generation in the knowledge of the fixed stars. In its 

 preparation he has had the assistance of a number of friends and colleagues, 

 who have supplied him with the material necessary to the presentation of 

 their latest researches. 



THE SOLAR SYSTEM. A Study of Recent 

 Observations. By CHARLES LANE POOR, Professor of 

 Astronomy in Columbia University. 6s. net. 

 The tides and tidal evolution, subjects but briefly treated in most astro 

 nomical works, are given considerable space in the present volume, and 

 Mars and the so-called Martian canals, about which so much has been 

 written, are somewhat fully dealt with. 



CLIMATE. Considered especially in Relation to Man. 

 By ROBERT DE COURCY WARD, Assistant Professor of Climat 

 ology in Harvard University. With Illustrations. 6s. net. 

 This work is based on lecture-notes prepared for the students of Harvard 

 University. Its aim is to co-ordinate and to set forth clearly and system 

 atically the broader facts of climate in language as free as possible from 

 technicalities. At the same time the needs of the teacher and student have 

 been kept constantly in mind, and the subject-matter has been arranged in 

 such a way as seems best to adapt it for purposes of thorough study. 



RIVER DEVELOPMENT. As illustrated by the 

 Rivers of North America. By Professor I. C. RUSSELL. 

 With Illustrations. 6s. net. 



CONTENTS 



To the Reader The Disintegration and Decay of Rocks Laws governing 

 the Streams Influence of Inequalities in the Hardness of Rocks on River 

 side Scenery Materials carried by Streams in Suspension and in Solution 

 Stream Deposits Stream Terraces Stream Development Some of the 

 Characteristics of American Rivers The Life-history of a River Index. 



