C 59 J 
n. SALTS, by their tafte and folubility in water are known from 
all other mineral fubftances, and are diftingtiifhed among 
themfelves by the kind of tafte and the degree of their foiu- 
bility. 
Hi. inflammables, are charadferized by their folubility in 
oii, by their fmoke or flame w’hen burnt, which is either 
grateful or difagreeable, innocent or dcieterious, and by their 
colour or teint. 
IV. METALS, are known by their luftre, gre§t weight, proper 
flux, and folubility in acids. 
V' PETRIFACTIONS, are not foftils of themfelves, but in rela- 
tion to the materials which compofe them ; they ditfer from 
the preceding clafles only in their form, which they receive 
from the bodies of one of the other kingdoms of nature. 
H z 
