THE AMERICAN 



MONTHLY 



Microscopical Journal: 



CONTAINING 



CONTRIBUTIONS TO BIOLOGY. ^ 



Polume \S, 



FOR 



m7. 



^ounbc& 1880, by H. fjitcf^cock. pubIisbe^ fincc 1887, by 

 (ttjas. ID. Smiley, ICasbington, P. *£., U. 5. 21. 



