OT bs PRINCIPLES OF BOTANY, ETC. 
ole, again produce buds. In this manner their growili 
continues. But this evolution of buds from buds 
would continue without stopping were it not so res. 
gulated, that each bud, as soon as the blossoms and 
fruits are perfectly formed, decays. ‘Then the branches 
stop in their growth. Each bud, as plants in gene- 
ral in all their parts, is formed by the air-vessels. , 
Cutting a bud in a transverse direction, a white 
spot appears, continued to the very extremity of the 
bud, which is nothing else than a bundle of air, 
vessels. If the same is done atan early period, an 
elongation of a very small bundle of the same kind 
is only found. 
§ 270. 
The leaves are composed of the same vessels of 
which the root, stems, and other parts of vegetables 
consist: But the manner in which they are dis- 
' posed presents a remarkable difference. A great 
bundle of vessels enters the base of the leaf, and 
spreads on its surface in a reticular manner, anasto- 
mosiig like plants, (§ 238). On this anastomosing 
of the vessels of leaves depends their form, and as 
it differs in each plant, we need not be surprised at 
the diversity of leaves. If the large vascular fascicle 
divides in three great divisions, a triangular leaf is 
formed; if it divides in more, then we see all the 
species of compound leaves arise, which, we have 
described in the Terminology. If for instance the 
vascular fascicle at the base of the leaf splits into 
smaller ones, a nerved leaf is formed. But if it 
run 
