Foreign Vegetables. 243 
Having flood a fufflcient Time in Digeftion they 
raife the Fire again, and continue it till the Cam- 
phore rifes into the upper Part of the Matrafs ; at 
which Time they are obliged to ufe the greateft: 
Caution, to hinder it from immediately Riling the 
Neck of the Veflel and burfting it: For this End 
a Rod of Iron, or Woock, is always thrufl down 
into the Neck to keep it open. When the Cam- 
phore is all fublimed, they remove the Fire, and 
leave the Matrafs to cool. When it is cold they 
break it, and take out the Camphore, which from 
the Shape of the VefTel refembles a round Cake. 
The feculent Matter, if any were mixed with it, 
is found in the Bottom of the Matrafs ; or if any 
Filth adheres to its Surface they pare it off with a 
Knife. 
When it has been thus refined, if it be burnt 
in the open Air, it leaves not the leaft Portion of 
Earth or Allies behind *, but it is entirely diffipated 
in Flame *, a Part of which is converted into black 
Soot, affording no Marks of Acidity •, wherein it 
differs from Benzoine and many other Refins. If 
it be diftilled in clofe Veffels, it is not refolved in- 
to its Principles, but rifes up in Flowers like Brim- 
ftone. It is foluble in Spirit of Wine and Oils, 
like other Refins ; and by procuring a large Quan- 
tity of common Water to the Spirit of Wine after 
a Solution of the Camphore, it prefently feparates 
again from it, and fwims upon the Top of the 
Liquor like Snow. It diffolves alfo, or rather 
melts, in Spirit of Nitrre and Aqua Regia , con- 
trary to other Refins, which always in acid Liquors 
of this kind become hard. Again, it diffolves int 
ftrong Oil of Vitriol, but is not converted into Oil, 
It likewife melts in Spirit of Salt, one Part of it 
becoming a whitifh vifcid Oil, the other rifing in 
Sublimation. The Salt of Tartar and Spirit of Sal 
R 2 Ammoni- 
