66 Mr. Roscoe on Artificial and Natural 
with one cotyledon, or with two cotyledons*; and having deter- 
mined this point, we then proceed by other rules to distinguish the 
-individuals in each department. By that of Linnzus we take the 
plant without any regard to its mode of germination, and from the 
parts of fructification immediatel y determine its character, and as- 
sign it to its proper genus. "That the mode in which plants arise 
from the seed +, or, more strictly speaking, that the seed itself, of 
which the cotyledons are formed, affords a true natural distinction, 
cannot be doubted ; but in estimating the advantages of this di- 
stinction, we must also estimate its disadvantages, and form our 
decision upon the whole result. The object attained by Jussieu 
is the separating from the great mass of vegetables, two portions; 
one of which, the acotyledones, comprehends the cryptogamous 
* This distinction it may be observed was made by Linneus himself, as the foundation 
of his Regnum Vegetabile; with the necessary and indeed indispensable addition of the 
zucca 
* Tribus vegetabilium tres vulgo numerantur. 
. Monocotyledones. Fruges 1. 2. 3. 
Dicotyledones. Plante 4. 5. 
Polycotyledones. = Rhizophora. 
Acotyledones. an dacii STUART, 8.9.” 
Linn. Reg. Veg. 3. 
T In his Philosophia Botanica, Linnzus has carried this method much further than 
Jussieu has done ; having divided the Monocotyledones into 
perforate. Gramina. 
unilaterales, | Palme. 
reducta. | Cepa. 
And his Dicotyledones into 
immutate. Legumina &c. 
plicata. .. Gossypium. 
duplicate. | Tetradynamia &c, 
obvolute. Helxine. 
spirales, | Salsola &c. 
reducta. Umbellatz. 
And in his Polycotyledones he enumerates Pinus, Cupressus, and Linum, p. 102. 
plants 
