CHEMICAL COMPOSITION OF MAIZE GRAIN 649 



(1) Proteose, soluble in pure water .... 



(2) Very soluble globulin 



(3) Maysin, soluble in extremely dilute salt-solution . 



(4) Edestin, soluble in more concentrated salt-solutions 



(5) Zein, soluble in alcohol 



(6) Proteid matter 1 soluble in dilute alkalies 



(7) Proteid matter insoluble in any of these solvents 



Plumule 



Radicle 



Crown starch 



-*~ Horny starch 



Tip-cap 



Fig. 225. — Physical composition of low-protein maize grain. (After Hopkins ; 

 from Bulletin of Illinois State Agricultural Experiment Station.) 



The mean percentage of nitrogen in maize proteids is cal- 

 culated by Hopkins as 16 -02. 



603. Zein. — The proteid zein is soluble in warm dilute 

 alcohol, but insoluble in water. It is characterized by a high 



'The protein is estimated by multiplying the amount of the nitrogen-con- 

 tent in the residue from 100 parts of maize, by the factor 6*25 {Hopkins, 4). 



