rs 



3IOLOGY 



LIBRARY 



8 



Set up, electrotyped, printed, and copyrighted September, 1894. Reprinted March, 1895. 



Revised, entirely reset, reprinted, and recopyrighted September, 1901. 



Revised, reprinted, and recopyrighted April, 1905. 



Copyright, 1905, by W. B. Saunders & Company. 



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PRESS OF 

 W. B. SAUNDERS & COMPANY, 



