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that the feveral Solutions which have been given of this 
fhmnomenon hitherto, are insufficient ; then difcourfesof 
the Nature of Poyfons and Antidotes, and the manner of 
their Operation ; and fhews that Fevers have rfianifeft 
Symptoms of Poyfbn accompanying them, and fuch a# 
would be produc d by Arfenic, Mercury, Colocynthis, 
or fome other known Poyfbn, and then concludes that 
the Cortex cures Them, as ether Antidotes do other 
Poyfons, and waves any farther nice Speculations con- 
cerning the manner of its Operation, which he knows 
can be but meer Guefles and Conjectures, and is content- 
ed to give an undeniable Proof that it is an Antidote : 
Among other Arguments to that purpofe, he thinks the 
fmalriefs of the Dole in which he gave it when it came 
over unadulterated,before the Merchants were fenfible cf 
its Value, and before Tailor knew it or made u(e of it, 
may pafs for One ; and the Performance of the Cure 
without any Evacuation, for another. He deduceth 
fome Coralleries from what he hath faid on that Sub- 
ject, and by the by teacheth us how External Medi- 
cines conduce toward the cure of Fevers; then proceeds 
in the next Chapter to give the Marks of the true and 
genuine Bark, becaufe that of the Shops is generally 
adulterated, and fets down feverai Forms in which he 
gives it, with this Remark, That it muft be given always 
in Subftance, becaufe the Chymical Preparations of it are 
fcarce ever found to have any Efficacy ; and fubjoins fe- 
veral Rules, which, if well obferv'd, may prevent the 
return of the Difeafe. 
The Hiftories in the 9th Chapter, which confirm all 
that he hath laid down in the preceding Treatife, are not 
of Regular intermitting Fevers cur'd by the Cortex, it 
being granted that Agues are daily fo cur'd, but of fach 
as were conceal'd under the Symptoms of other Difta r es, 
as Colic, Apoplexy, Rheumatifm, Peripneumony, Uni- 
verfal Spafm, &c. which is a Work of great moment 
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