PLATE 58 
i to 5.—Cross sections from fixed and stained portions of the little tumors which 
developed on the leaf shown in Plate 56. Each one is bounded by an epidermis, and 
in places stomata are visible, as at X. The smaller cells in each, best seen in figure 3, 
are cross sections of incipient vascular bundles. Figure 4 is a section just below 
(inside) the lower surface of the leaf. At the bottom is epidermis showing stomata. 
On the right is unchanged loose tissue of the leaf out of which the hyperplasia has 
developed. This shows large intercellular spaces. In the middle at the left is the 
compact tissue of the tumor, while above it is transition tissue. Observe absence of 
intercellular spaces in the tumor and the beginnings of spiral vessels. X 160. Figure 
5 shows spiral vessels enlarged from the center of the tumor in figure 4. X640. 
