

Ganong Leaf-Area Cutter 



performs with exactness and facility the demonstration 

 of increase of organic substance through photosynthesis 

 b}' comparing the morning and evening dry weights of 

 equal areas of similar green tissues. 



List price, complete with two perforated aluminum 

 cups, marked with the letters M and N (morning and 

 night), $12.00. 



Catalog of Ganong Apparatus will be sent free on 

 request. 



Bausch y Ipmb Optical.(p. 



NEW YOftK WASHINGTON CHICAGO SAN FRANCISCO 



LONDON I^OCHESTEH, N.Y. f-f^ANKFORT 



