SCIENCE— ADVERTISEMENTS 



A SCIENCE LIBRARY 



THREE ADDITIONS 

 The Physiology of Twinning 



By Horatio Hackett Newman 



In this book the author develops his theory of the 

 cause of twuining wMch was first ad%'aaiced in 1917 in his 

 volume, The Biology of Twins. He now uses it as a work- 

 ing hypothesis to explain a long arraj' of peculiar twin- 

 ning proieesses in diverse groups of animals. Interested 

 primarily in the causes and consequences of twinning, he 

 discusses all known types of complete or partial one-egg 

 twinning in the animal kingdom. His experiments, which 

 tend to indicate that twinning is a phenomenon much 

 more general than previousty supposed, are here published 

 in the hope that atudy of the biological processes involved 

 in twinning may solve some of the riddles of life. Eeady 

 Januarj' 1. $1.75, postpaid $1.S5. 



The Antiquity of Disease 



By Roi" L. MooDiE 



A non-teclmical rpresentation of geological evidences of 

 disease. From the examination of fossil vertebrates and 

 the bones of early man, a record is here constructed of 

 prehistoric paJt.hological conditions and, for the first time 

 in published form, tliere is given a discussion of the rela- 

 tion of such e'iddenee to the origin and evolution of dis- 

 ease. With especdally prepared illustrations, this work 

 will be of particular service to those interested in medical 

 history, general evolu,tion, zoology, and geology. Ready 

 February 10. $1.50, postpaid $1.60. 



The Story of the Maize Plant 



By Paul Weatheewax 



The only complete, - modern exposition of tie, mor- 

 phology of the maize plant. In this volume Mr. Weather- 

 was is interested in giving a well-balanced, reliable sum- 

 mary of our present botanical knowledge of maize. He 

 eliminates the influence of the economic point of view 

 and describes maize as a plant, with problems of its o^wn 

 to solve, a life of its own to live, and a part of its own 

 to play in the drama of organic existence. His treatment 

 of the biological individuality of maize is accompanied by 

 a brief discussion of the influence >of corn upon ancient 

 and modem American civilizations, and the reciprocal re- 

 actions of human activities upon the plant. Eeady Feb- 

 ruary 15. $1.75, postpaid $1.85. 



The University of Chicago 

 Science Series 



has been designed to occupy a 

 position between the short arti- 

 cles of technical journals and 

 elaborate treatises which attempt 

 to cover several or all aspects of 

 a wide field. The volumes of 

 this series present the complete 

 results of experiments or series 

 of investigaitions which previ- 

 ously have appeared only in 

 scattered articles, if published at 

 all. They confine themselves to 

 specific problems of current in- 

 terest and present the subject in 

 as summary a manner and -with 

 as little technical detail as is 

 consistent with sound method. 

 They are wiTJtten not only for 

 the specialist but .for the edu- 

 cated layman, and are small 

 duodecimo volumes bound uni- 

 formly in maroon cloth. The 

 following titles are published 

 and for sale at your bookstore 

 or the publishers: 



The Evolution of Sex in Plants 



By John Merle Coulter $1.25 



Individuality in Organisms 



By Charles Manning Child. $1.50 



The Origin of the Earth 



By Thomas C. Chamberlin, $1.75 



Finite Coliineation Groups 



By Hans F. Blichfeldt, $1.50 



A Chemical Sign of Life 



By Shiro Tashiro. $1.25 



The Biology of Twins 



By Horatio Hackett Newman. $1.50 



Food Poisoning 



By Ediyinpakes Jordan. $1.25 



The Electron 



By Robert Andrews Millikan. $1.75 



The Living Cycads 



By Charles J. Chamberlain. $1.50 



Problems of Fertilization 



By Frank R. LUlie. $1.75 



The Origin and Development 

 of the Nervous System from a 

 Physiologiccd Viewpoint 



By Charles M. Child. $1.75 



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