I 
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Ob. Were this experiment fufficiently authenti- 
cated, it would eftablifh a great preference in favour 
of the method of extra&ing tin&ures in B. M. not 
only from its producing them more ftrong, but from 
the much greater expedition with which theprocefs 
is executed. 
Experiment VII. 
Half a dram of the powder of bark was infufed 
for 24 hours in cauftic volatile alkali ; and the tin&ure 
produced did not effervefce with acids, but retained 
a volatile-alkaline fmell. 
Ob. Is it therefore probable that the cauftic 
volatile-alkali does not attract fixable air from the 
bark ? 
Experiment VIII. 
When fome of an aqueous infufion of the bark 
was poured to fome cauftic volatile-alkali ; a white 
cloud appeared at the bottom of the phial, which 
foon difappeared, and the liquor became of a high 
reddifh colour, without fhewing any effervefcence 
with acids. 
Experiment IX. 
Lime water and powdered bark, being macerated 
in the proportion of ten ounces of the former to one of 
the latter, in a well flopped phial, and then filtered; 
neither affedted the colour of violet paper, nor pre- 
cipitated the corrofive fublimate from its folution in 
water. 
Ob. This experiment was made a year before 
Mr. M r Bride had publifhed his very ingenious eftay on 
the diflolving power of quick lime. The view with 
which it was made, was to determine, whether, after 
infufion, 
