PRINCIPLES OF ZOOLOGY. 













" A work emanating from so high a source as the 

 ' Principles of Zoology,' hardly requires commendation 

 to give it currency. The public have become acquainted 

 with the eminent abilities of Prof. Agassiz through his 

 lectures, and are aware of his vast learning, wide reach of 

 mind, and popular mode of illustrating scientific subjects. 

 In the preparation of this work, he has had an able coad- 

 jutor in Dr. A. A. Gould, a frequent contributor to the Transactions of 

 the Boston Society of Natural History, and at present engaged upon the 

 department of Conchology, for the publication of the late exploring expe- 

 dition. The volume is prepared for the studtnt in zoological science ; it is 

 simple and elementary in its style, full in its illustrations, comprehensive 

 in its range, yet well condensed, and brought into the narrow compass 

 requisite for the purpose intended." SilUmaris Journal. 



" The reading of the work has afforded us double the satisfaction it would otherwise 

 have done, on account of the implicit confidence we felt in the statements and illustra- 

 trarion* of the talented authors. 



Besides what we have already written, we cannot help urging readers generally, and 

 especially those who are collecting libraries and are fond of good books, to add this, to 

 their catalogue." Christian World, Boston. 



" Such books as this fasten upon our 



minds the disagreeable impression that we 



have come into the world half a century 



too early. The schoolboys of the next gen- 

 ration can scarcely escape, even with great 

 itre, the catastrophe of becoming learned. 



The volume before us must introduce a new 



epoch in the study of this branch of natural 



science. It combines all the essential ele- 



ments of a good text-book ; being at once 



comprehensive, even to exhaustion of the subject, yet concise 

 and popular. The beauty of the paper, and typography, and illustrations, will aid the 

 fascination which the contents exert upon the mind. A single glance at a chapter on 

 Embryology, bound us with a spell which we could not shake ojf, till we had looled through 

 the volume. The names of the authors are vouchers for the merits of the work. 

 Professor Agassiz is without a rival in his department of science. His associate is widely 

 known by his valuable contributions to the Conchology of Massachusetts, which have 

 won favorable notice from the savans of Europe. We hope the approbation of the public 

 substantially expressed, may encourage the authors to complete the series so auspiciously 

 commenced. ' ' Philadelphia, Chronicle. 



" This work is designed as a text book for Schools and Colleses, and as an exposition 

 of the interesting science of which it treats, it has many obvious advantages over any 

 other treatise extant. It is the joint production of two gentlemen, whose researches in 

 Natural History have enlarged the domain of human knowledge, and one of whom stands 

 confessedly at the head ot the science of the age. It hence contains the latest and most 

 approved classifications, with explanations and illustrations, borrowed from the forms of 

 animated nature, both living and extinct, and made accurate and perfect by the fullest 

 acquaintance with the present condition of Zoological science. As a text book it is ad- 

 mirably conceived. 



" The presence of Prof. Agassiz in the United 'States, has given a new impulse to 

 every branch of Natural History, and we are happy to find him thus associated with Dr. 

 Gould one of our leading American naturalists in explaining his favorite science to 

 the youth of our Schools and Colleges." Providence Journal. 



" No such work had previously appeared in our country. The production is worthy 

 of the great names under whose care it has been prepared. Schools and Academies 

 will find it opens up a new and attractive study for the young ; and in no country is 

 there a finer field opened np to the naturalist than in our own." Christian Alliance, Bos- 



ton. 



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