2 g Dr. Crawford’s Experiments , &c. 
Jould be perfectly fafe, I once took twenty drops of It diluted 
with water, I foon afterwards, however, felt an obtufe pain, 
•with a fenfe of conftriction, in my ftomach and bowels. This 
uneafmefs, notwithftanding the ufe of emetics and laxatives, 
lafted for feveral days, and was at length removed by drinking 
water impregnated with fulphureous hepatic air. 1 afterwards 
found, that Ae manganefe, which had been ufed in the diftilla- 
tion of the acid, contained a fmall portion of lead. 
Dr.lNGEN-Housz informed me, that a Dutchman of hisac- 
quaintance, fome time ago, drank a confiderable quantity of 
the dephlogifticated marine acid : the effects which it produced 
were l'o extremely violent, that he narrowly efcaped with his 
life If therefore this acid fhould hereafter be employed as an 
internal medicine, it would be neceffary to prepare it by means 
of manganefe that has been previoufly feparated, by a che- 
mical procefs, from the lead and the other metals with which 
that fubftance is ufually contaminated. 
•V 
