THE METABOLISM OF PLANTS. 



175 



it could combine to form proteid ; when this supply was pro- 

 vided the asparagin disappeared. 



The following tables of analyses will illustrate the foregoing remarks : 



i. The production of asparagin at the expense of proteid in the 

 depositories of reserve-materials. 



Beyer's analysis of Yellow Lupin seeds and seedlings, 2 3 inches 

 long ; the cotyledons are the depositories, as the seed is exalbuminous. 



2. The changes undergone by the non-nitrogenous reserve-materials. 



These are well illustrated by Peters' comparative analyses of the oily 

 seed and of the seedling of the Pumpkin (Cucurbita). 



