298 PRINCIPLES OF BOTANY, ETC. 
ferent nature, at times dry or juicy , at other timés 
‘ consisting of clos¢ and narrow cells. 
Animals, with the exception of .some of the 
vermes, are simple beings, but most plants not so; 
for some plants and alin excepted, which are 
simple plants, the rest are all of a compound struc- 
ture. If we put the seeds of an annual plant, (§ 122, 
No. 3, @.), in the ground, plants grow from it, 
which soon flower, produce seeds, and then die. . 
The buds of trees and shrubs are to be considered 
is annual plants, for as soon as they have blossomed 
ne a ne seeds! they” decay, entirely.” “Nhe 
trunks of trees and shrubs, as well as the roots of 
perennial plants have a great many buds, which are 
all of the same nature, and may be considered as 
repositories of many other annual ‘plants. ‘They are, 
therefore, not simple, but like the polypes in the 
animal kingdom, compound bodies. Below the bark 
in these plants there are, according to the species, 
as we shall more particularly specify, the rudiments 
of a number of buds, which by due supply of sap, 
may be finally evolved. We are, therefore, not to 
go beyond new-formed branches of clipped willows, 
(§ 216), as reproduced, though they have been pro- — 
duced by the formative nisus, which gives each - 
plant its peculiar form and growth. ) 
G i229. 
The chemical principles appear to be different in 
vegetables and animals, when considered in general. 
But if we take all the single substances, found in 
| veges 
