200 



IOWA ACADEMY OP SCIENCES. 



in some cases may be differentiated into two parts. The 

 remains of the nucellus may be made out in tlie region of the 



Fig. 6. 

 Dent corn, a, epidermis; c, capsule; t, testa; «', aleuroae cells; s, starch cells. 



hilum. The endosperm and embryo constitute the most import- 

 ant part of the seed from an economic standpoint. The first 

 layer of the endosperm consists of the aleurone. This is 

 made up of cells nearly uniform in width and length, and 

 surrounds the endosperm. These cells in colored varieties 

 contain some of the pigment. In some cases the cells are 

 somewhat longer than broad. 



