INTRODUCTION 57 



aleurones, especially in seeds, and grain contains a 

 large proportion in the outer layers of the endosperm, 

 being large or small in different cases. 



Amides are crystalline substances found in the 

 cell-sap, e.g. asparagine found in the parenchyma. 



Alkaloids are the compounds which form the basis 

 of the poisonous and other principles which are used 

 as drugs, e. g. nicotine. 



[The remainder of the Introduction will be found at the 



beginning of Vol. III.] 



