= he Sale: RF enc 
Soy PERFECT plant consists of the 
root, oe stem or trunk, the stalk, the leaves, the flower, 
and the fruit. 
R are either annual, lasting one year, as th 
ical; to the air, 
As soon as the young plant feeds fens “thé soil, it re- 
quires the assistance of leaves, which are the organs by 
quantity of sap absorbed is always in proportion to the 
quantity of fiuid thrown off by transpiration. 
The Trunk, or Stem, is that part of a plant which 
a the leaves and flowers, and serves to eek 
them above the ground. It consists, 1. Of th ider- 
mis, catil or exterior thin membranous pane 
res, which transmit or throw off the 
excretory ie gi of vegetation; answering to the skin 
of animals. nipesers: vest outer bark, consists of 
d utricles viti cells 
to receive the =) so very numerous, and close to- 
gether, as to form a continued coating. It is among 
these glands that re work of digestion appears to be 
2 5 
D setts 
ter ¢ {> te 
performed; and the product of this elaboration is after- 
wards conveyed through the whole vegetable, by vessels 
propagated through all its parts; these conduits even 
passing ae the body of the tree, crossin g 
neous stra this net-work it is that the coloring 
of penn is bape nae the light which 
Epidermis concurs i 
vital principle of a plant is chiefly seated; 
easily detached from each other; their ar (fibrous 
scales or layers) are not extended lengthwise along the 
ari ; 
paper. In sronabiion as bars c 
ligneous body, or wood, th 
length form the external ee part of the wood, which 
workmen call the sap. The wood or ligneous part of the 
plant, is a _ compact fibrous substance, formed by new 
which appear upon cutting vente stem near the root. 
The bark is the most essential part of the vegetable, 
by means of which the Se oo. of life, such 
as nutrition, cigeeiae tions, &c., are per- 
formed. 
bark of a tree is only a a congeries of the roots o 
the individual es alae These roots sp 
themselves over the last year’ 
with a new bark the old roots also. 
bark over the old one, and hia deacunding, cover 
at 
ve « 
