The American 



MONTHLY 



CROscopicAi mm 



CONTAINING 



CONTRIBUTIONS TO BIOLOGY. 



Chas. W. Smiley, Publisher, Washington, D. C. 

 Terms: For the United States, $2.00. For Great Britain, 8 Shillings. 



Vol. XV, No. 4. 



APRIL, 1894. 



No. 172. 





■'■d 



Highest Honors 



AVVAHDED TO 



^has. Marchand s 



Glyc ozone 



Worlds Columbian Exposition, 



Chicago ,1893 

 borator/ N'" 28 Vn n ce Street ^ 

 New-Jo rK "* ^ 



