they be Town or planted in proper feafons 
and foils, fuch as will afford them their due 
proportion of nourifhment ; which foils, as 
they are exhdufted, mult, as ’tis well known, 
from time to time, be replenifhed with frefh 
compoft, fuch as is full of faline, fulphu- 
reous and aereai particles, with which com- 
mon dung, lime, afhes, fword, or burn- 
bated turf abound: As alfo fuch manures 
as have nitrous and other falts in them ; for 
tho* neither nitre nor common fait be found 
in vegetables; yet fince they are obferved 
. to promote fertility, it is reafonable to con- 
clude, that their texture is greatly altered 
in vegetation, by having their acid volatile 
falts feparated from the attracting central 
air and earthy particles, and thereby mak- 
ing new combinations with the nutritive 
juice ; and the probability of this is further 
confirmed from the great plenty of air and 
volatile fait, which is found in another com- 
bination of them, viz. in the Tartar of fer- 
menting liquors : For it is the opinion of 
Chymifts, that there is but one volatile fait 
in nature, out of which all other kinds of 
falts are formed by very different combina- 
tions, all which nutritive principles do by 
various combinations with the cultivated 
earth. 
