( 77 ) 
covered with a mod Subtil Sulphur, as is demondra* 
ble by Chymical Analyfis; and the common Sal Vo- 
latile Oleofum is an admirable Contrivance upon the 
fame Foundation, where a very Volatile Animal Salt 
is covered with a mod exalted vegetable Oil, where- 
by it is fuited to pafs into the minuted Fibres, and 
make as it were, a Part of the Animal Spirits them- 
lelves. 
And here it may not be amifs to obferve, that all 
Animal Salts are very Volatile, or eafily render’d fo, 
but when bare, and naked, jud as the Fire draws 
them out, with a mixture alfo of its own Particles in 
their Compofition, they are too pungent ro be felt 
without painful Senfations, but when foften’d with a 
fine Portion of an oppofite Texture, which is fmooth 
and yielding, they become mod efficacious, and fafe 
Sudorificks, 
On theie Confiderations it likewife ceafeth to be a 
wonder why the fubtil Salts of Cantharides are more 
fetftfibiy injurious t$ the Bladder, than any other Parts, 
and why Camphire prevents thofe injuries; for the ex- 
quifite fmallnefs of thofe Spicula makes them imper- 
ceptible, but in the mod minute Canals, into which 
the Fibres compofing the Membranes of the Bladder 
are known to be divided ; and Camphire blunts their 
irritations, becaufe its exquifite Subtilty enables it to 
follow them into thofe Meanders, and {heath their 
Afperities. 
To this purpofe it is very remarkable, what many 
(as 1 have been informed) now commonly practice in 
guarding even Mercurials againd their dimulating 
Properties, and fending them into the fined Paflages 
to operate by Fufion, and the bare Force of impulfe: 
for not only Calomel and the Mercurius Dulcis may 
be redrained from manifed Operation in the wider 
Paflages > 
