CHEMICAL COMPOSITION OF MAIZE GRAIN 661 



Table CI 1 1. 

 PERCENTAGE COMPOSITION OF THE HORNY GLUTEN. 



CHAP. 

 XIII. 



617. The Homy Starch. — The " homy starch" is found on 

 the back and sides of the grain, lying next below the horny 

 gluten. It does not consist of pure starch, but contains con- 

 siderable amounts of other substances, especially protein. In 

 an examination of the grain with the unaided eye the horny 

 glutenous part and the horny starchy part are not readily dis- 

 tinguished from each other, the line between them being 

 somewhat indefinite and indistinct. Together they constitute 

 the horny part of the grain. 



Table CIV. 

 PERCENTAGE COMPOSITION OF THE HORNY STARCH. 



Percentage Composition 

 Of Horny Starch. Of Whole Grain. 



Protein . 

 Oil . 

 Ash 

 Carbohydrates 



IO*20 



■24 



•24 



89-32 



roo-oo 



42-36 

 232 

 738 



51-12 



The horny starch is only half as rich in protein as the 

 horny gluten, but as there is so much more of it (it comprises 

 up to 45 per cent of the whole grain), it contains 42 per cent 

 of the total protein-content, and 51 per cent of the total 

 carbohydrates. 



The percentage of horny starch varies in individual plants, 

 and may be greatly increased by breeding. 



