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PRINCIPLES OF ZOOLOGY. 



" On almost every subject we have scores of new books without new principles, but 

 not so with the work before us ; indeed several of the highly interesting topics presented 

 and illustrated have no treatise in the English language. It contains a large amount of 

 valuable information, and will be studied With profit and interest by those who have made 

 respectable attainments in Natural History, as well as by those just commencirfg this 

 science. This volume is finely executed, and should find a place in every library. As a 

 text-book for schools and colleges it is far superior to any work before the public." 

 New- York District School Journal. 



" Professor Agassiz stands confes- 

 sedly at the head of Zoological science, 

 and his coming among us is everywhere 

 hailed with delight and enthusiasm, 

 and the influence of his mission is 

 everywhere felt already, and it will 

 continue for a century to come. Dr. 

 Gould is one of the most indefatigable 

 and accurate investigators in natural 

 science of our country, and we greet 

 with real pleasure the association of 

 his name with that of Prof. Agassiz in 

 the preparation of this "work. 



Our space will not allow anything 



like a review of this admirable and to us novel work. The plan is 

 quite unlike those elementary works which teach us the mode of clas- 

 sifying animals by a few important characteristics. It commences by 

 explaining the sphere and fundamental prinicples of Zoology, and 

 follows by showing what are the general properties of organized bod- 

 ies ; the functions of organs in animal life ; the nervous system, the 

 senses, motion, nutrition, circulation, &c. K^ The diopter on Emlry- 

 ology alone is of more actual interest in philosophical Zoijloyy, than all* 

 that has ever appeared on the. subject of Zoology, in our (ountry. And as we before re- 

 marked, this knowledge is nowhere else to be had in the English language. The geograph- 

 ical distribution of animals forms another important feature of very deep and general 

 interest." Albany Argus. 



" I have read with the greatest satisfaction the volume on the principles of Zoology. 

 It is such a book as might be expected from the eminent ability of the authors, Professor 

 Agassiz and Dr. Gould. So far as I know it is the most comprehensive and philosophical 

 elementary treatise on the subjects of which it treats, which has yet appeared. 



It is well adapted to the purpose of being used as a text-book in schools, and I shall 

 employ it in preference to any other in my own school, whenever I have a class in the 

 elements of Natural History, and I can strongly recommend it to other teachers." Gcorijc 

 B. Emerson, Esq., Chairman of the Boston School Committee on Books. 



G. K. & L. have in the press PROFESSOR AGASSIZ'S " TOUR TO THE LAKES." 

 It will contain an interesting narrative of the excursion, by Elliot Cabot, Esq., and the 

 Scientific Researches of Prof. Agassiz, with elegant illustrations, in one volume, (5ctavo. 



CONTRIBUTIONS TO THEOLOGICAL SCIENCE : 



BY JOHN HARRIS, D. D. 



I. THE PRE- ADAMITE EARTH : 1 volume, 12mo. cloth. Price, 85c. 



II. MAN: His Constitution and Primitive condition. With a portrait of the author. 



"His copious and beautiful illustrations of the successive laws of the Divine Manifes- 

 tation, have yielded us inexpressible delight." London Eclectic Review. 



