[ 231 ] 
An ounce of the infufion of chamomile flowers, 
was divided into two equal parts ; to one was added 
a dram of white wine vinegar, to the other an equal 
quantity of fpring water. Thus, with refpedt to 
dilution, they were precifely in the lame circum- 
fiances; a tea fpoonful of the fal martis, was then; 
mixed with each of them, the portion which con- 
tained the vinegar, fufFered no change of colour ; the 
other inftantly affirmed a dufky hue. The fame Ex- 
periment was repeated, with a very ffrong triturated 
infufion of the Bark; and the refult was ffill more 
fingular and curious. As foon as a dram of vinegar 
was added to half an ounce of the infufion, it changed 
the colour of it, from a deep and reddifh brown, to a 
bright yellow ; whilff the fame quantity of water 
had no lenfible effea: on the other portion with which 
it was mixed. The chalybeate folution, as in the 
former Experiment, was then added. It produced 
no alteration in the portion with vinegar, but the other 
was changed into a perfe&ink. 
That moderate heat promotes and aflifts the a&ion 
or water, as a menflruum on the Bark, is evident 
from the IXth Experiment; and it would be of 
advantage to determine, what degree of heat this drug 
will admit of, without fuftering a decompofition. It 
fhould however be remarked, that this infufion though 
fironger, had neither fo agreeable a flavour, nor was 
fo fenfibly impregnated with the aroma of the Bark, as 
the two made with cold water. 
In an effay on the diffolvent power of quick-lime, 
a very ingenious chemift has obferved, that all refi- 
nous bodies become foluble in water, when the cohe- 
fion of their particles is deftroyed, by withdrawing 
the 
