CHEMICAL COMPOSITION OF MAIZE GRAIN 651 



examination, the ears whose kernels show a large proportion CHAP, 

 of germ being high-oil corn, and those with small germs, low- XIIL 

 oil corn. About 12 percent of the total oil is contained in 

 the horny gluten, leaving only about 5 per cent of the oil 

 distributed among the remaining five physical parts, and more 

 or less of this small amount is undoubtedly absorbed from the 

 contiguous germ. or horny gluten." 



To breed maize for high oil-content, select for seed those 

 ears having grain with large embryo. 



605. Carbohydrates. — The carbohydrates include the starch, 

 sugar, pentosans, gums, organic acid, crude fibre, and bodies 

 other than the protein, ether-extract (fats) and ash. In ana- 

 lyses made to determine feeding-value, the amount of " crude 

 fibre" which includes the cellulose and is largely indigestible, is 

 given separately and the remainder of the carbohydrates stated 

 under the heading "Nitrogen-free extract" . 



The function of the carbohydrates as foodstuffs is to pro- 

 duce fat. Hopkins finds the carbohydrates to be distributed 

 as follows in the grain of a medium protein percentage ear : — 



Table XCIV. 



DISTRIBUTION OF CARBOHYDRATES IN MAIZE. 



606. Ash. — The percentage of ash in maize grain is com- 

 paratively low, i.e. 1*5 per cent in moist grain and 17 per cent 

 in dry. The following is the average of 1 5 analyses as given 

 by Wolff {Aschen Analysen. 1880): — 



