plumule and caulicle within. The plumule consists of successive layers of
rudimentary leaves, the outer enclosing the rest (Fig. 10, 1, _c_). The
latter is the first leaf and remains undeveloped as a scaly sheath (Fig.
10, 2, _c_). In Wheat and Oats the cotyledon can be easily seen in the
largest seedlings by pulling off the dry husk of the grain. The food will
he seen to have been used up.

[Illustration: FIG. 10. 1. Germination of Indian corn. 2. Same more
advanced. _a_, caulicle; _c_1, first leaf of the plumule, sheathing the
rest; _c_2, second leaf; _c_3, third leaf of the plumule; _d_, roots.]

The series of Corn seedlings, at least, should be drawn as before and
the parts marked, this time with their technical terms. The following
questions should then be prepared.

CORN.

What are the parts of the seed?

Compare these parts with the Morning-Glory, Sunflower, Bean, and Pea.

Where is the food stored?

How many cotyledons have Corn, Wheat, and Oats?

How many have Bean, Pea, Morning-Glory, and Sunflower?

Compare the veins of the leaves of each class and see what difference you
can find.