188 AN INTRODUCTION 
TALL A Pate 
Of SimPLre. Leaves. 
EAVES are tobe confidered in three 
Refpetts, viz. 1. as Simple. 2. Com-, 
pound. °3. Determinate. We thall in this 
Chapter treat only of the Simple. 
~ SIMPLE Leaves are fuch as have only a 
fingle Leaf ‘on a Petiole. They differ in 
refpect to Cizcumfcription, Angles, Sinus, 
Apices, Margin, Superficies, and Subfiance. 
CIRCUMSCRIPTION confiders ‘the 
Yorm of the Circumference of Leaves where 
there areno Angles or Sinuations: In which 
refpect. Leaves are, 
Orbiculate, round; when the longitudinal 
and tran{verfe Diameters are equal, and the 
Circumference circular. 
Subrotund, roundifo; when the Figure is 
nearly orbiculate. 
Ovate, Egg-/haped; when the longitudinal 
‘Diameter exceeds the tranfverfe ; and the 
Bale is circumf{cribed with the Segment of 
“a Circle, but the Apex is narrower. 
Oval, or Eliptic; when the longitudinal 
Diameter exceeds the tranfvefe, and the 
Circum- 
