XVII. THE GRAMMAR OF SCIENCE. By Prof. Karl 

 Pearson. Illustrated. 



" The problems discussed with great ability and lucidity, and often in a 

 most suggestive manner, by Prof. Pearson, are such as should interest all 

 students of natural science." — Nahiral Science. 



XVIII. PROPERTY: ITS ORIGIN AND DEVELOPMENT. 



By Ch. Letourneau, General Secretary to the Anthropo- 

 logical Society, Paris, and Professor in the School of Anthropo- 

 logy, Paris. 

 "M. Letourneau has read a great deal, and he seems to us to have 



selected and interpreted his facts with considerable judgment and learning." 



— Westminster Keviezu. 



XIX. VOLCANOES, PAST AND PRESENT. By Prof. 

 Edward Hull, LL.D., F.R.S. 



" A very readable account of the phenomena of volcanoes and earth- 

 quakes. " — Nattcre. 



XX. PUBLIC HEALTH. By Dr. J. F. J. Sykes. With 



numerous Illustrations. 

 "Not by any means a mere compilation or a dry record of details and 

 statistics, but it takes up essential points in evolution, environment, prophy- 

 laxis, and sanitation bearing upon the preservation of public health." — 

 Lancet. 



XXL MODERN METEOROLOGY. An Account of the 

 Growth and Present Condition of some Branches 

 OF Meteorological Science. By Frank Waldo, Ph.D., 

 Member of the German and Austrian Meteorological Societies, 

 etc.; late Junior Professor, Signal Service, U.S.A. With 112 

 Illustrations. 

 "The present volume is the best on the subject for general use that we 

 have seen." — Daily Telegraph (London). 



IMPORTANT ADDITION TO THE SERIES. 



Price $2.50. 



XXII. THE GERM-PLASM: A THEORY OF HERE- 

 DITY. By August Weismann, Professor in the U?iiversity 

 of Freiburg-in-Breisgau. With 24 Illustrations. 



"There has been no work published since Darwin's own books which 

 has so thoroughly handled the matter treated by him, or has done so much to 

 place in order and clearness the immense complexity of the factors of heredity, 

 or, lastly, has brought to light so many new facts and considerations bearing 

 on the subject." — British Medical Journal. 



XXIII. INDUSTRIES OF ANIMALS. By F. Houssay. 



With numerous Illustrations. 

 " His accuracy is undoubted, yet his facts out-marvel all romance. Thes'? 

 facts are here made use of as materials wherewith to form the mighty fabric of 

 evolution. " — Manchester Guardian. 



New York: Charles Scribner's Soxs. 



