( iyv($ ) 
hian' knthots SL$ 2L prefervativej by Arfenicky which mAra 
bick is called Zarnkk: 
As for ^nts as Cicuta^ Aconitnm^ OEnanthe Cicnt/e facie 
rfticco Virofo, 6^0. he imputes their deadly effefts to their 
Corrofive parts, which rarifyihg the Juices ot the Stdmach, 
and wounding it Nervous Membrane by an eafy and intel- 
ligible procefs, induce all thofe diforders which at lift end 
in death. For beginning their Havock in the Stomach, they 
draw all parts by degrees into a communication of Pains and 
Agony. 
Here lie makes it plain hov/ Mineral and Vegetative Poy- 
fons the ot the fame kind, work fo differently from their 
different force. And how, tho Mineral Poyfon« feldom pafs 
ihe Pr/W Vid^ yet Vegetables often do. . This Effay con* 
eludes with an ingenious conjefture at the compofitions of 
thofe Poyfons, by which the Africans and Indians are 
reported to be able to kill at long diftances of time, and fome 
direftions about the Cure. 
ElTay 4. Opmm lie tells us coines under the Head of Nar- 
cotic Poyfons, tho a noble Remedy exhibited in a proper 
quantity. To aflift our conceptions about the Nature of this, 
he explains the Nature ot Sleep sit large, of which I (hall on- 
ly lebearfe thus much, that as it concerns the BoJy, 
it conhfts in an eafy, and a fort of iEquilibrious difpofition 
df the Fluids, and Mufcular parts. As to the Mmd, in a ceC- 
fation of fuch thoughts as we exercife whenawake, upon 
which we refleft, and will to employ oui Minds. 
After this and a Chymical Apalylis ofOf?i-'/^ itf-lf, he 
afcribes its efficacy to a Volatile^ Alcaline 5*2/^ intimately mixt 
i^ith a Sulphurous fubftance, which he proves at large to 
aii upon the Stomach and the Anerial Fluid itfelf, and dif- 
pofe in fuch a manner as it is d ^fpufed when we Sleep. He 
lliows further how by the fame Mech^^nifm this Drug eafeth 
Pains, checks Evacuations, caufes difficulty of Breathings but 
above all; how in too great a qaaatity it commenceth F<>y- 
