THE UKIYERSITY OF CHICAGO PRESS 



The Origin of the Earth. (The University of Chicago 

 Science Series.) By Thomas C. Chamberlin, Head of the Depart- 

 ment of Geology in the University of Chicago, xii + 272 pages. 

 12mo. Cloth, lis 6d net. 

 This book, by oue of the leading geologists of the world, sets forth the disclosures 

 that led to the rejection, one after another, of the older views of the origin of our 

 planet, the futile attempts then made to amend these or to build others upon the 

 same foundations, the final rejection of all these, and the construction of a radically 

 new view based on a new dynamic foundation. The later chapters of the book treat 

 of the early stages of the earth and of the way in which its leading processes took 

 their start from their cosmogonic antecedents, these being held to be essential 

 factors in the genesis of the planet. 



Heredity and Eugenics. By John M. Coulter, William 

 E. Castle, Edward M. East, William L. Tower, and Charles 

 B. Davenport. 312 pages. 8vo. Cloth. 19s 6d net. 



Heredity and Eugenics is a book intended to present the recent developments of 

 knowledge in reference to evolution, heredity, and eugenics, and related subjects. 

 Five of the leading investigators in this field have collaborated in its production, 

 and the result is a woi-k which will appeal to the general public, because it presents 

 the latest conclusions in a popular and extremely interesting manner. 



Senescence and Rejuvenescence. By Charles Manning 



Child, Associate Professor of Zoology in the University of Chicago, 

 xii + 482 pages. Svo. Cloth. 26s net. 



The author of this volume, after some fifteen years of experimental investigation 

 of the nature and origin of the organic individual, has established certain facts which 

 afford a more adequate foundation for the general consideration and interpretation of 

 the age changes in the organic world than we have hitherto possessed. 



Certain experimental methods have made it possible not only to follow the 

 phj'siological age changes in some of the lower animals, but to learn something of 

 their nature. The most important I'esult of this investigation is the demonstration 

 of the occurrence of rejuvenescence quite independently of sexual reproduction. 

 The book differs from most previous studies of senescence in that it attempts to 

 show that in the organic world in general rejuvenescence is just as fundamental and 

 important a process as senescence. 



Individuality in Organisms. (The University of Chicago 

 Science Series.) By Charles Manning Child, x + 212 pages. 

 Small 12mo. Cloth. 10s net. 



Professor Child's work is an attempt to state, and to present evidence in support 

 of, a conception of the nature of organic individuality which the author has developed 

 as a I'esult of fifteen years of investigation of the processes of reproduction and 

 development in the lower animals. In these forms organic individuality appears in 

 relatively simple terms, and it is hei'e that we must look for the key to the problem 

 of individuality in the higher animals and man. The book appeals not only to the 

 physiologist and to the botanist, but also to the neurologist, to the psychologist, and 

 even to the sociologist. 



The Biology of Twins. (The University of Chicago Science 



Series.) By Horatio H. Newman, Associate Professor of Zoology 



in the University of Chicago. x + 186 pages. Small 12 mo. Cloth. 



10s net. 



In this volume many questions i-elative to twinning have been answered partly 



through a study of data on human twins themselves and partly through a much 



more detailed study of what has proven to be the most remarkable type of twinning 



known — that in the armadillos of the genus Dasypus. 



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