134 Sfearns of Arfenlc how mlfchlevous . 
Cholic Pains, and cramped all over for an 
Hour or twos when thefe ugly Symptoms 
were taken away by his drinking Milk and 
Oil, and he became indifferently well s they 
were followed however by a flow Fever like 
an Heftic, which thick by him the whole 
Winter, and of which he recovered very 
ilowly by a proper Regimen in Diet 
The extreme Subtilty and Penetrability of 
thefe Steams are remarkably manned: by 
their furprizing EfFedt in the Experiment 
* Glauber tells us, in his Treatife de Salibus, that Co~ 
halt and Arfenic , though violent Poifons, are yet harmlefs 
unlefs taken in Subftance, but if exalted by a Sublimation 
with Saks and rendered volatile, the very Fumes of thepi 
will kill, as is well known to thofe who prepare the 
Water called Aqua gradatopa from a Mixture of Vitriol, 
Nitre, and Arfepic, the leak Vapour or Fume whereof 
inftantly affcdts the Heart with the moft horrid Tremors, 
and exceedingly diforders the Brain itfelf: a Candle 
will likewife be nearly extinguiihed in the faline Fumes' 
thereof. 
In Dr. Mead’s Mechanical Account of Poifons, 3d Edit, 
pag. 225, are thefe Words, “ I had once in my Pof- 
s ‘ feffion, given me by an ingenious Chemilt, a clear Li- 
“ quor, which though ponderous, was fo volatile, that it 
tf would all fly away in the open without being 
“ heated; and fo corroflve, that a Glafs Stopple of the 
* e Bottle which contained it, was in a ihort Time fo 
* e eroded, that it could never be taken out. The Fume 
f* from it was fo thin, that if a Candle was fet at fome 
“ Diftance from the Bottle, upon a Table, the Heat would 
«* diredt its Courfe that Way; fo that it might be poifonous 
? e to any one that fat near to the Light, and to nobody 
et befldes.” The Dodtor very humanely conceals this 
Gompbfition, left an ill Ufe might be made thereof. 
