264 SOILS* MANURES, &c. 
J 
I 
upon it may preferve it perfeftly fweet* 
and in good condition, either as an ingre¬ 
dient in a comport, or for whatever pur- 
pofe in vegetation it may be intended. 
Numerous are the compound and neu¬ 
tral falts found in various foils; but they 
are all combinations of fome fpecies of 
alkali’s and acids, or of acids with 
earthy and metallic fubftances ; it does 
not appear neceflary to diftinguifh them 
here particularly by name, or to enter 
into a minute detail of their refpeflive 
properties, as it is prefumed what has 
been already obferved on the fubjefl, 
will be fufficient, without attempting 
to defcribe all the portible attraftions, 
combinations, and effe&s on vegetation, 
thofe fubftances are capable of, which 
indeed, would amount to little more than 
a meer hypothefis, unfounded on aftual 
experiment. 
The 
