1 88 
OF THE USE 
witnefs to the efficacy of the Virginia avens 
and the monacda in intermitting fevers, and 
of the root of the ceanothus , and diervilla in 
venereal cafes ; if we had not learned how to 
raife thefe plants ? Or to what end would it 
have lerved to crofs the ocean, and attain the 
American water gladiole , if we had not found 
out that it was of the genus of our water gla- 
diole? The Europeans at vaft expence went 
on buying the moxa from China, the figwort 
from Brazil, and the jachafchapuch from North 
America, till it was known that they grew in 
our own countrey. 
§. 12 . 
There is, as it were, a certain chain of cre- 
ated beings, according to which they feem all 
to have been formed, and one thing differs fo 
little from fome other, that if we fail into the 
right method we ffiail fcarcely find any limits 
between them. This no one can fo well ob~ 
ferve, as he who is acquainted with the greateft 
number of fpecies. Does not every one per- 
ceive, that there is a vaff difference between 
a ftone and a monkey ? but if all the inter- 
mediate beings were fet to view in order, it 
would 
