A STUDY OF WHEAT. 



The ash contains a large proportion of phosphoric acid in 

 combination with lime and other bases. The amount of fatty 

 matter or oil is notable, varying with the kind of corn from 

 six to eleven per cent. The hard flinty kinds of corn have 

 the most, and the starchy kinds the least, oil. 



Wheat contains about one and a half per cent, of fatty matter. 

 The only objection to corn seems to be a deficiency of glutin 

 or of nitrogenous substances as compared with wheat, for there 

 seems to be no glutinous,- residue left when washed with water 

 as there is in wheat. It is said by Gorham, to contain a red- 



r - 3- Cross Section of a Kernel of Indian Corn. Magnified 

 350 Diameters. Drawn with the Camera Lucida. 



dish nitrogenous substance, to which he has given the name 

 Zeine. 



The testa of the kernel of Indian corn, or the fruit and 

 seed-coats are reduced to two only. The epidermis, or outer 

 coat, consists of one row of longitudinally elongated, tabular 

 cells, where the thick, coarsely dotted wall is noted for the 

 bearded appearance of its margin. See Fig. 4. The inner 

 coat is composed of six or seven layers of parenchymatous 

 cells, all running in one direction, and about three times as 



