compounding Ingredient be perfedly ionocenf.' Of the lat- 
ter there is no doubt, the innocency of the foMner he 
proves by feveral inftances, and the Nature of ilsigpperatidn^ 
as a Medicine, in which lie declares himfelf to agree with the 
Learned Author of the nev7 Theory of Fevers, to whom he 
refers for a farther account of this matrer. The compofiri- 
on becomes deftrudive^ as hemoft ingeoiouflly informs os^ia 
that the Globules of Mercury which rife in Fame, loJge 
themfelves in the Pores.and Infterftices of the Saline Cryftafs. 
Now thefe being like fo many (harp Blades wound more for- 
cibly by the addition of this weight of the Mercurial Glo- 
bules, and more conftantly and irrefiftablyj becaure the In« 
fterftices, at which the Scomachiek Juices would otherwife 
enter anddiffblve thefc woundmg Salts, are already poffelTed 
by the Particles of Mercury. This account will be the more 
acceptable to thofethat read on, til! they fee how in purfu- 
anceof the fame principles the Doftor explains (whit feem??. 
hitherto to have been in vain attempted J the deftruftion of 
this corrofive Quality by a fecond Sublimation. 
Next he fetches the Nature of Arfemck out of the datknefs 
and obfcurity, in which it hath lain till now. And here 
after an accurate Enumeration of the feveral kinds both Na- 
tive and Faftitious, having examined upon Chymical Princi* 
pies its Compofition, he accounts for its operation much 
after the fame manner, as for Sublimate Corrofive : There be- 
ing here alfo cutting Salts and a RugnD^ to give tbem weight 
and force. Only it is to be obf^rved, that the Sfilphrr difco- 
verahle in Arjcmckhothhy fmcil and its inflammability, fcrve 
as an additional Vificulum to the wounding Spiaila, a^id by 
its heat to inflame tlie Wounds which they have made. He 
concludes this Eflay with wonder at a dangerous cnftomthat 
hath prevailed among feme to wear a bag of this Corrofive 
Mineral at the pit of the Stomach, as an A nuler ag:iinfl: the 
Plague. Into vyhich he moftprobibly conpdures men were 
lead, bf fome ignorant Wrirers who faU]^ Tranflired Dir- 
fni(w\xiQh fignifics Cinnamon, and is lecommendcd Ly Ara- 
