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Experiment II. 
Equal quantities of each refiduum were boiled in 
three ounces of lpring water over a flow fire, for the 
fpace of twenty minutes. The decoctions were equally 
turbid, exadly fimilar in tafte ; and on the admixture 
of the chalybeate folution in the proportion of one 
dram to half an ounce, they affumed precifely the 
fame colour, namely a dufky brown, like chocolate, 
but inclining fomewhat to purple. 
Experiment IJI. 
Five ounces of each refiduum were infufed, for 
the fpace of forty hours, in an ounce and a half of 
Jamaica rum, which was lufilciently pure, and unim- 
pregnated with any aftringent matter from the 
cafk. The tinCtures were exaCtly alike in tafte and 
colour ; and on the addition of one dram of the chaly- 
beate folution, they were inftantly changed from a 
deep red, to a dark and dirty brown j which was 
precifely the fame in both tinCtures. 
Experiment IV. 
To half an ounce of powdered Bark, was added 
an ounce of cold fpring water. The mixture was 
well triturated in a marble mortar, after which it 
was fuffered to remain at reft until the grofs powder 
iubiided. The clear liquor was then carefully poured 
of f, and frefh water to the quantity of half an 
ounce was added ; the trituration w r as renewed, and 
afterwards part of the tnenftruum poured off again 
as before. This method was purfued for the fpace 
of 
