BOTANICAL CHARACTERISTICS. 17 
(The awl shaped figure in Fig. 2, with ovule at 
base.) The pollen develops down into this tube 
and fertilizes this embryo 
seed (ovule) at its base on 
the little cob. The small, 
rough point seen on the 
round or flat head of a 
kernel of corn is the point 
where this silk was at- 
tached to it. 
The kernel or seed.— 
While but one botanical 
FIG. 2.—A longitudinal section of Species Of corn 1s culti- 
Pee ne cere waved, this: one. may) be 
wit os ee Gawiaed* into. five;-groups 
or races. Each race is characterized by nu- 
merous varieties, and these freely cross-fertilize, 
so that two or three types of seed may be found 
on the same ear. This race difference, so far 
as the writer knows, was first pointed out by 
Dr. E. L. Sturtevant.* These races may be de- 
scribed as follows, and the relative differences 
* Maize: An attempt at classification. By E. Lewis Stur- 
tevant, M. D., Rochester, N, Y., 18°4, p. 10; illustrated. 
9 
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