Of Camp hire. iBp 
If no Heat at all be applied there will 
be more Time to examine the Configura¬ 
tions ; nor even then will much Patience 
be required, for the Camphire and Spirit of 
Wine are both fo volatile, that if the Drop 
be fpread thin, they will foon begin to 
form, and quickly after they vanifh quite 
away. 
Camphire is of great Service when by any 
Accident too large a Dofe of Opium has 
been taken. 
CHAP. LI!. 
Of Manna. 
T HIS fweet-tafted Salt is the Concre¬ 
tion of a juice ifluing from a kind 
of Afh Tree during the Heat of Summer: 
that from Calabria is accounted heft. It 
eafily dilfolves in Water made feme what 
hot, and a Drop of the Solution is a very 
pretty Objedt for the Microfcope. 
Its firft Shootings are Radiations from 
Points at the very Edge of the Drop : The 
radiating Lines appear opake, but extreme¬ 
ly flender, vid. a a a, Plate XL Amongft 
thefe arife many minute tranfparent Co¬ 
lumns, whofe Ends grow wider gradually 
as they extend in Length, and terminate at 
laft 
