198 AN INTRODUCTION 
Nervofeé; when they have fimple uns 
branched Veffels, that extend themfelveg 
from the Bafe to the Apex. 
Cohred; when they change their Green 
for fome other Colour; as in Amaranthus 
tricolor T. 
Glaéra, fmooth ; when the Surface is void - 
of all Inequality. 
The SUBSTANCE of a Leaf refpeés 
the Conditions of its Sides: In this refpect 
Leaves are, 
Leretes t, round like a Pillar; when they. 
are for the moft Part ~pliatiail 
Semicylindric, like a halved Cylinder ; when 
they are round on one Side, and flat on the 
other. 
Tubulof, \ike a Tube or Pipe; when upon 
cutting them they appear to be hollow 
within. 
‘Carnofe, flefhy or facculent ; when they are 
filled with a Pulp. 
C omprejjed, fatted ; when they are fo com- 
+ Three-coloured. 
} Round one Way and long the other: Our Lan- 
guage has no diftin€& Term to exprefs Roundnefs in this 
Senfe; the Figure is by Mathematicians called a Cylin- 
der, from a Greek Word fignifying to roll; a Body 
of this Figure being the beft adapted to that Sort of 
Motion. 
prefled 
