t 22 3 ] 
of thirty. four hours, in which time fix ounces of 
water were combined with the Bark. The mixture 
was then infufed fourteen hours without heat, and 
Brained off. This infufion was found to have the 
lfnell and tafie of the Bark, in a confiderable greater 
degree than either the decodion or infufion without 
trituration of Experiment I. and it affumed a much 
blacker colour, on the admixture of one dram of the 
chalybeate folution, than either of the two former, 
preparations. 
Experiment V: 
It was attempted to determine the comparative 
Brength, or rather aftringency, of five preparations of 
the Bark, viz., the ex trad, decodion, cold infufion, 
tindure and triturated infufion. Ten grains of the 
extrads carefully made, and as free from empyreuma, 
as this officinal preparation is generally found to be; 
were mixed with an ounce of hot water. But fo 
impeded was the folution, or, to fpeak more properly, 
the fufpenfion of the Bark, that in a few minutes a 
large powder was depofited at the bottom of the glafs. 
This however was fhaken up, and one dram of the 
chalybeate folution was. added to the mixture. The 
fame quantity was added to half an ounce of the 
decodion, infufion, tindure, (Pharm. Lond.) and 
triturated infufion ; the lafb affumed by far the deepeft 
black; the extrad approached neareft to it, and the 
tindure appeared to be the leaf! tinged. The 
decodion and infufion were precifely alike in co- 
lour. 
Expe- 
