154 AN INTRODUCTION 
CHAP. Xxx. 
Of Generic Diftindions. 
AVING now gone throygh the Ex- 
planation of the Claffes and Orders 
of the Sy{tem, we come to the Diftinctions 
of the Genera, Thefe, by the Theory of 
the fexual Syftem, are to be regulated by . 
the Frudtification only. The Parts of Fruc- 
tification known to the earlier Botanifts were 
few, and might be well thought infufficient 
for diftinguifhing the vegetable Productions 
of Nature: They therefore had Recourfe 
to the Habit of Plants, and other Circum- 
flances; and by this Means a great Number 
of Genera were eftablifhed, which the new 
Syftem is obliged to reje@t. Of thefe we 
fhall give the Reader an ample Lift of In- 
ftances in Chapter 31. 
The Frudtification being admitted as the 
only Foundation of the generic DiftinGions, 
all Vegetables that agree in their parts of 
Fru@ification are to be put together under 
one Genus; and all fuch as differ in thofe 
Parts are to be divided. The characteriftic 
Mark of each Genus is to be fixed from the 
Number, Figure, Proportion, and Situation 
of 
