METABOLISM 



THE GANONG WATER CULTURE SUPPORT 



is correct in principle and simple in operation. 



The plants are securely supported both above and below the seeds 

 by the two aluminum disks whose perforations are closed with 

 paraffin, proper openings being made to accommodate the seedlings. 



A double screw keeps the disks parallel and serves to regulate the 

 distance between them. An opaque sleeve keeps light from the 

 tumbler containing the culture solution. 



Professor Ganong grew ten corn plants in this Support to a height of 

 four feet, the mass of healthy roots filling the tumbler as a mold. 



Price, complete, $1.10 



Our catalog of Ganong Botanical Apparatus describes in detail 26 different 

 pieces of apparatus. Every teacher should have a copy. 



Bausch £5" Ipmb Optical (o. 



NCW YORK WASHINGTON CHICAGO SAN FRANCISCO 



london &OCH ESTER., NY. ™ ANKFORT 



