[ 66o ] 
I (hall not prefume to offer any Opinion as to the 
Manner this Medicine operates, but leave it to be 
confidered by more proper Judges; only permit me 
to obferve, that were the Virtues of Simples diligently 
inquired into, we might perhaps difeover more ready 
and certain Cures for fome Diftempers than what we 
know at prefent. The barbarous Negroes , merely 
by Trials and Obfervations, have been able to find- 
out both Poifons and Counterpoifons, on which (if 
our Accounts of them be true) they can depend with 
Certainty : And we know,, that the Savages in Ame- 
rica have difeovered by the fame Means, and gene- 
roufly taught us, the medicinal Effects of their Ipe- 
cacuanha , Contrayerva , 'Peruvian Bark , and fome 
other Simples, which are almoft infallible in curing 
the Diforders of the Climate where they grow : Nor. 
is it improbable, that every Country may produce 
Remedies for the Difeafes of its Natives. 
LONDON:. 
Printed for T. Woodward, and C. D a v is, over- 
againft Grafs Inn- Gate in Holbourn ; Printers 
to the Royal Society. 
N. B. Dr .forms Diflercarions were firft printed thus: 
Di(T i. 
3 - 
4 - 
5 - 
6 . 
7 - 
8 . 
D'Jfertatio 
in Tr anj. 'actions , N° 355. 
3 <> 3 - 
in Comment. Acad. Petrop. Tom. III. p. 28 L 
in Tran[attio:is , N° 355. 
373 - 
3 ^ 8,3 59 - 
. . ...... 362. 
361. 
at the End of the 8 preceding, under the Title of 
ics Ploy pco- Mathematics^ An Store Jacobo Jurin, M. D. 
Lond, 1732. 8°. See Page 6 oj. 
