Special Functions and Relations 



187 



single average plant being taken as the basis of the dia- 

 gram, each major ordinate denoting .1 gm.: 



FIG. 50. Antitoxic action of calcium and magnesium nitrate ; curves of 

 total green weight (unbroken line) and green weight of stem (broken 

 line). 



In the cultures diagramed above the whole period of 

 growth is 17 days. The original quantity of the solution 

 was maintained by replacing with distilled water the loss 

 by transpiration ; but after 14 days all solutions were 



