226 AN INTRODUCTION 
INTRAFOLIACEOUS, on the Infide of 
the Leaves, in Ficus and Morus. 
EXTRAFOLIACEOUS, on the Outhide 
of the Leaves, in A/nus, Betula, Tilia, and 
the Clafs Diadelphia. 
CHAP. XVIII. 
Of PUBESCENCE. 
UBESCENCE, Downine/s*, is an Ar- 
mature, by which Plants are defended 
from external Injuries. Puéefcence is of the 
following Kinds, viz. 
SCABRITIES, Roughnefs; which is 
compofed of Particles fearce vifible to the 
naked Eyey, that are fcattered over the. 
Surface of the Plant. This is diftinguifh- 
able into, 
_ 1. Scabrities GLANDULOSA, a glandulfe 
Roughne/: ; when it confifts of little Glands, 
which are either, 
Miliary, ike Grains of Millet. 
* The Term Downinefs is not to be taken here in too 
frit a Senfe, as the following Explanations thew. 
+ Guettardus was the firft who carefully examined this 
kind of Pubefcence. 
Veficua 
