ACCESSORY FOOD BODIES 



107 



The first set were distributed among three bottles, 

 each having a capacity of 200 c.c. The bottles were 

 filled with physiologically pure water, to which the 

 pure salts necessary for Detmer's nutrient solution 

 Ammonia 400, Phosphate 200, and Potash 1,220, 

 parts per 1,000,000 were added. The second set 

 were grown in a solution precisely similar, except 

 that o'35 parts per 1,000,000 of the Silver nitrate 

 fraction of treated peat extract had been added. 

 The bottles were aerated daily, and the solutions 

 changed twice a week. Every sixteen or seventeen 

 days the plants were removed, dried, and weighed. 

 The results obtained were as follow : 



The distinction between these two experiments is 

 brought out strikingly in the following diagram, 

 where the weights of the two series of plants are 



* The poor growth of the seedlings in this series is explained 

 by the fact that the experiment was made early in the year, 

 when the plants obtained very little sunshine. 



