COLUMBIA UNIVERSITY BIOLOGICAL SERIES. V. 



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311 



THE 



FOUNDATIONS OF ZOOLOGY 



""/, 

 - / X 



BY 



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WILLIAM KEITH BROOKS, PH.D., LL.D. 



PROFESSOR OF ZOOLOGY IN THE JOHNS HOPKINS UNIVERSITY 



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PUBLISHED FOR THE COLUMBIA UNIVERSITY PRESS BY 



THE MACMILLAN COMPANY 



LONDON : MACMILLAN & CO., LTD. 

 1899 



All rights reserved 



