THE COMPARATIVE PHYSIOLOGY 



AND 



MOPPHOLOGY OF ANIMALS. 



By Professor JOSEPH LE CONTE. 



Illustrated. 12mo. Cloth. 



THR work of Darwin on the derivation of species and the 

 descent of man awakened a new interest in the lower 

 animals, and furnished additional evidence of their close 

 kinship with ourselves. A fresh field of study was thus opened 

 Lip, embracing the likenesses and differences of action as well as 

 structure found throughout the animal kingdom. In this work 

 I'rofessor Le Conte gives us, in his well-known clear and simple 

 >tvle and with the aid of numerous illustrations, an interesting 

 outline of these similarities and variations of function as displayed 

 among the various classes of animals from the lowest to the 

 liighest, man included. 



-^EVOLUTION BY ATPOPHY^ 



By JEAN DEMOOD, JEAN MASSADT, and EMILE VANDEDVELDE. 



A New Volume in the International Scientific Series. 



12mo. Cloth, $1.50. 



THE purpose of this work is twofold. The authors aim to show, first, that an essential 

 element of the process of evolution as it goes on among plants and animals is the degen- 

 eration or atrophy of organs or parts at the same time that other parts or organs are being 

 carried to a higher state of development, these modifications of structure being attended with 

 corresponding changes of function. The changes that thus take place in the organism, be they 

 degenerative or progressive, are a part of the process of adaptation that is everywhere forced 

 upon the living being by environing conditions. Secondly, they point out that what is true 

 in these respects in the field of life or biology is also true in social phenomena or sociology. 

 Societies, like individual organisms, are ever changing, ever undergoing modification through 

 influences that operate both from within and without. The resulting social evolution is attended 

 by the phenomena of degeneration or atrophy, institutions and customs that were once in the 

 ascendant declining and giving way to be replaced by more highly specialized forms of activity. 



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