Fig. 199. The true leaves developing.
Fig. 200. Marking the root.
Fig. 201. The root grows in the end parts.
Fig. 202. The marking of the stem, and the spreading apart of the marks.
Now let us make a similar experiment with the stem or stalk. We will mark a young stem, as at A in [Fig. 202]; but the next day we shall find that these marks are farther apart than when we made them (B, [Fig. 202]). The marks have all raised themselves above the ground as the plant has grown. The stem, therefore, has grown between the joints rather than from the end. The stem usually grows most rapidly, at any given time, at the upper or younger part of the joint (or internode); and the joint soon reaches the limit of its growth and becomes stationary, while a new one grows out above it.