CHEMICAL COMPOSITION OF MAIZE GRAIN 653 

 The percentage of water contained in the various foodstuffs CHAP. 



varies greatly; dry maize-grain contains 10 to 12 per cent; 

 dry oat-hay or " forage" about 15 per cent ; pasture-grass up 

 to 75 P er cer, t ; cabbages, pumpkins, and " prickly-pear," or 

 spineless cactus " leaves," about 90 per cent. 



608. Physical Composition of the Grain. — The maize grain 

 is not a homogeneous mass, and from the milling and feeding 



XIII. 



«gS555?!JCS5SES^^^^333533j33533^tek 



Plumule 



Radicle 



Crown 

 starch 



Horny 

 starch 



Horny 

 gluten 



Fig. 226.— Physical composition of high-protein maize grain. (After Hopkins ; 

 from Bulletin of Illinois State Agricultural Experiment Station.) 



points of view it is important to know the chemical composi- 

 tion of the several parts into which it is separable. A grain of 

 maize consists of six readily observable and distinctly different 

 physical parts, known as : — 



