Pt 
A N 
P a 
68 Mr. Roscoz on Artificial and Natural 
appearance, and instead of saying. that the plant rose from one 
cotyledon and is therefore a grass, that it is a grass and therefore 
rose from one cotyledon? At all events, it imposes a difficulty 
on the student without affording an adequate advantage, and 
throws a doubt over the great mass of individuals of the vege- 
table kingdom, to be removed only by inquiring into the mode 
of their early growth, in order to separate from the rest some de- 
tached plants which are equally as well separated by other di- 
stinctions quite as natural and more permanent, and which it is: 
indeed impossible should be confounded with them. | 
‚This peculiarity in the method of Jussieu being considered, 
the.two systems, as far as they regard the great mass of the ve- 
getable kingdom, may now be placed in more direct comparison. 
Linneus has founded his primitive distinctions. on the number 
and proportions of the stamina; not omitting the diversities 
arising from their situation. Jussieu, disregarding in his primary 
“distinctions the number of the stamina, has recourse merely to 
their situation, which he distinguishes into three different man- 
ners, as being placed upon, around, or below the germen, under 
the appellations of Epigyna, Perigyna, and Upogyna*. This 
distinction is applied however only to his apetalous and poly- 
petalous plants, thé monopetalous plants being distinguished 
not immediately by the stamina, but by the situation of the co- 
rolla. This necessarily compels him to commence his definitions 
by the corolla, and accordingly he first divides his dicotyledonous 
. * With respect*to these distinctions, the most important in the arrangement of Jussieu, 
the reader (növov "Agony ferm) may consult Mr, Salisbury’s ‘ Observations on the Peri- 
gynous Insertion of the Stamina of Plants;" where he has undertaken to show that such 
perigynous insertion is entirely factitious, and that there is no instance whatever, in the 
whole vegetable kingdom, of stamina being inserted in the calyx. V. Trans. Linn. Soc. 
vol. viii. p. 1. af : 
plants 
