THE PRINCIPLES OF ZOOLOGY: 



TOUCHING THE 



STRUCTURE, DEVELOPMENT, DISTRIBUTION, NATURAL ARRANGEMENT 



OF THE 



RACES OF ANIMALS, LIVING AND EXTINCT: 



WITH NUMEROUS ILLUSTRATIONS, FOR THE USE OF SCHOOLS AND COLLEGES. 



PART I. -COMPARATIVE PHYSIOLOGY: 



BY 



LOUIS AGASSIZ AND AUGUSTUS A. GOULD. 



PRICE, ONE DOLLAR. 



The design of this work is to furnish an epitome of the leading principles of the science 

 of Z >OLOGY, as deduced from the present state of knowledge, so illustrated as to be 

 intelligible to the beginning student. No similar treatise now exists in this country, and, 

 indeed, some of the topics have not been touched upon in the language, unless in a 

 strictlv technical form, and in scattered articles. It has been highly commended, by the 

 most eminent men of science, and by the public press. A few of which are here given, 

 together with a sample of the cuts illustrating the work. 



tJSrO 



" This work has been expected with great interest. It is not simply a system by which 

 we are taught the classification of Animals, but it is really what it professes to be the 

 1 Principles of Zoology,' carrying us on, step by step, from the simplest truths to the 

 comprehension of that infinite plan which 'the Author of Nature has established. . . 

 This book place-" us in possession of information half a century in advance of all our 

 elementary works on this subject. ... No work of the same dimensions has ever 

 appeared in the English language, containing so much new and valuable information on 

 the subject of which it treats." -Professor James H Albany. 



