126 . A SYSTEM OF 
norance and idlenefs have invented certain terms 
or expreffions, to avoid giving an account of thofe 
ores or mineralifations, which are not eafy enough 
to be decompounded ; for inftance, wild^ 'ra'p ad- 
dons ^ arfenical^ volatile^ &c. and fome iron ores 
in particular have been thus called *, by which 
means it has happened, that oeconomical reflec- 
tions have often been added to natural and phi- 
lofophical defcriptions : and thus others are. de- 
terred from examining many bodies, of which we 
have got, and ftill retain falfe notions by this way 
of proceeding. 
The manganefe has by fyflematifts been com- 
monly ranked among fuch iron ores but the 
artificers who make ufe of it in the manufadlure 
of glafs do not know it ^ nor can they by any 
means be perfuaded to ufe any of the pretended 
bodies a-kin to it, inftead of the manganefe itfelf, 
fince experience prevails more with them than 
fuppofitions. The confumption of the manganefe 
is but fmall, and therefore it is not a very profit- 
able article. 
SECT. CXIX. 
The SECOND CLASS. 
The SALTS, Salia, 
By this name thofe mineral bodies are called, 
which can be diflTolved in water, and give it a 
tafte ; and which have the power, at leafl: when 
they are mixed with one another, to form new 
bodies of a folid and angular fhape, when the 
water in which they are diflTolved is diminifhed 
to a lefs quantity than is required to keep 
them 
I 
