Ganong Leaf-Area Cutter 



performs with exactness and facility the demonstration 

 of increase of organic substance through photosynthesis 

 by 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 0* Ip"it> Optical (o- 



NEW YOnK WASHINGTON CHICAGO SAN FRANCISCO 



LONDON R.OCHESTEa, N.Y. f^I^ANKrORT 



