4 OBJECT LESSONS IN BOTANY. 
riding horseback). Each leaf, first on this corner, then on 
that, infolds or overlays all that is within it. 
138. Obvolute vernation appears in the leaf-bud of Sage 
(Fig. 228), where each leaf infolds only half of the blade of 
its opposite leaf. 
230 281 232 
Vernation.—Fig. 230. Cherry leaf-bud,—convolute. F%g. 281. Lilac,—imbricate. 
Fig. 282. Birch leaf,—plicate. Fig. 238. Dock,—revolute, Fig. 284. Balm-of-Gil- 
ead,—involute. 
139. In the bud of Dock (Fig. 233) we find the young 
leaves revolute, or rolled backwards from both edges; but in 
the bud of Balm-of-Gilead (Fig. 234) they are envolute, or 
rolled inwards from both edges. This is best seen under a 
microscope of one lens, ¢. ¢., a single microscope. 
140. In the bud of Tulip-tree (Fig. 225) each leaf is recla- 
nate, being bent over forward and infolding all within it; 
and in the Fern (Fig. 226) it is ezreinate, or coiled from the 
top downwards, like a watch-spring.  -— 
188. The obvolute? 
139. What the vernation of Dock? of Balm-of-Gilead ? 
140. Please describe the reclinate ; the circinate. 
