B & L. 0. 



Complete with one reagent tube, one tube support, two pieces of tubing, 

 two clamps. List Price $3«00 



PHOTOSYNTHOMETER 



which was designed by Professor Ganong, permits photosynthesis to be 

 measured as well as demonstrated, the quantity of photosynthate being a 

 function of the quantity of the gases absorbed and released. 



We shall be pleased to send descriptive catalog of Ganong Apparatus on 

 request. 



Bausch ^ Ipmb Optical (5. 



NEW YOftK WASHINGTON CHICAGO SAN FRANCISCO 



LONDON R.OCHESTEa, NY. f^RANKFORT 



