Entered according to Act of Congress, in the year 1867, by 

 IVISON, PHINNEY, BLAKEMAN, & CO., 



in the Clerk's Office of the District Court of the United States for the Southern District of 



New York. 



BIOLOGY 



LIBRARY 



G 



UNIVERSITY PRESS : WELCH, fcicELow, & Co., 

 CAMBRIDGE, 



