THE AMERICAN 



MONTHLY 



Microscopical Journal 



CONTAINING 



CONTRIBUTIONS TO BIOLOGY. 



Polume \8, 



FOR 



1897. 



^ounbcb \880, by H. f^ttct|cock. publtst^cb since 188', by 

 (ttjas. VO. Smiley, rDasl^ington, P. €., U. 5. 21, 



