12-8 Arfenic made from Cobalt • 
fotrse final! Part of the faid Drop becomes 
fo feparated from the reft, as to make a 
fort of fmaller Drop, wherein a more mi¬ 
nute kind of Configurations are formed, 
upon the fame Plan as the larger ones in 
the Drop itfelf. And this the Reader may 
conceive better, by viewing the Picture be- 
fore him, than by any Defcription in my 
Power to give. 
As Corrofroe , Sublimate and Arfenic are 
two Poifons nearly alike in their Opera¬ 
tion and fatal Confequences, I think it 
beff to treat of them together in this 
Chapter. 
The Fumes that rife from m Cobalt , in 
making of Smalt from that Mineral, being 
collected under the Appearance of a whitiih 
Soot, that Soot, by a farther Procefs, is 
converted into the common White Arfenic , 
which is what I now am fpeaking of. 
It is brought to us in flattifh Pieces of 
feveral Pounds Weight, and when newly 
broken appears tranfparent like Glafs or 
* Cobalt is a hard and heavy mineral Subfiance, common¬ 
ly of a blackifh grey Colour, fomewhat refembling the Ore 
of Antimony, but lets fparkling and more difficult to break. 
Some of -it has Spots of a Purple or rather crimfon Co¬ 
lour, which are called the Flowers of Cobalt . When 
jqafted or calcined in a reverberatory Furnace with cer¬ 
tain Proportions of Pot Allies and common Salt, it pro¬ 
duces a dark Blue, glaffy, or cryftaline Matter called 
Zajfer or Smalt, and the Fumes collected in this Procefs 
afford by different Management the White, Fellow, and 
jsd Arjenics . 
Cryfical, 
