it ferments in a ftill greater degree, when it 
is melted with the microcofmic fait. 
5. It does not excite any effervefcence with the 
fpirit of nitre : aqua regia, however, extrads 
the colour out of the black, and diffolves 
likewife a great deal of it, which, by means 
of an alcali, is precipitated to a white 
powder. 
6. Such colours as are communicated to glafles 
by manganefe, are eafily deftroyed by the 
calx of arfenic or tin : they alfo vanifh of 
themfelves in the fire. 
y. It is commonly of a loofe texture, fo as to 
colour the fingers like foot, although it is of 
a metallic appearance when broke. 
SECT. CXIV. 
Manganefe is found, 
A, Loofe and friable, Magmfia friahilis terrU 
formis, 
a. Black, feems to be weathered or decayed 
particles of the indurated kind, from Eng« 
}an4. 
SECT. CXV. 
B, Indurated, Magnefia indurata. 
1. Pure, in form of balls, whofe texture 
confifls of concentric fibres, Magnefia para 
• fph^rica radiis concentratis, 
a. White, Magnefia alba ftridle fic didia^ 
IS very fcarce. 1 have feen a fpecimen ojf 
this kind in a colledion from an unknown 
place in Norv/ay *, and by examining a 
piece of it, I found that it differed from 
the 
