1o AN INTRODUCTION 
_ That the Calyx, as proceeding from the 
Cortex of the Plant, is coarfer and thicker 
than the Corolla, which is produced by the 
foft, pliant, colored Liber, is obvious to every 
one. But there are no Limits determinable 
from any fuch Circumftances, unlefs it be 
from the Color; and even this is not fuf- 
ficient; for the Perianthium of the Bart/a 
is Blood-colored ; and there are alfo many 
Flowers whofe Corol//z are colored, naked, 
and fubje& to lofe their Petals when in the 
State of Flowering, but which afterwards 
harden and turn Green, and remain on the 
Plant like a Calyx; as for Inftance, the 
Helleborus and Ornithogalum, 
The Euphorbia has deceived many, who 
have defcribed it as monopetalous, taking 
the Calyx for the Corolla. But that the 
Pelte*,.as they are called, upon the Leaves 
of the Lichen, are really the Petals of the 
_Flower, is proved by fome annual Species in 
India, in which there are white Petals very 
diftinguifhable. 
* The Pelaare the Fruétification of the Lichen. 
They are flat, and are for the moft Part faftened to the 
Edges of the Leaves. 
CHAP, 
