242 ^ Treatise on 
purities. It is now called Camphre brute , and is af- 
terwards refined by the Dutch , who bring it from 
the Indies , by a particular Method of Sublimation. 
The Procefs, as defcribed by G^oncvius in his Dif- 
fertation upon Camphore, is as follows. 
They firft bruife the Camphore and pafs it 
through a Sieve, to clear it from the Filth j then 
they put a Pound and half, or two or three Pounds 
into a low Glafs-Veffel or Matrafs, leaving an 
empty Space at the Top. The Bottom of the 
Matrafs is flat, and the Neck narrow. This they 
place upon Sand, keeping its Sides quite free. The 
Pot containing the Sand defcends downwards and 
gradually terminates in a Point like a Cone. Under 
this they kindle a ftrong Fire and keep it up till 
the Camphore boils like Water. Whilft it melts 
they cover the Matrafs with many Folds of Cloth 
fewed together, with a Hole in the Middle to re- 
ceive the Neck of the Matrafs ; upon which they 
then fix a Cone, fomething longer than the Neck, 
made of a metalline Subftance which the Dutch call 
Blith. 
When the Camphore is entirely melted, and in a 
ftrong Ebullition, they leflfen the Fire, by taking 
away fome of the Coals, and by throwing Afhes 
upon the reft, fo as to fuffer a moderate Heat to 
remain. Half an Hour after the Boiling has ceafed., 
they take off the Cloths and Cone, leaving only 
fome Cap-Paper correfponding to the Diameter of 
the Matrafs, with a Hole in the Middle, to pre- 
vent its breaking by the too immediate Action of 
the cold Air. They likewife cover the Neck of 
the Matrafs with a Cone of Paper, and thus with 
a gentle Heat they keep the Camphore melted, 
for fome Hours. By this Digeftion fome of its 
oily and thinner Parts are thrown off, fo that it 
will afterwards concrete into a more dry and folid 
Mafs. 
Having • 
