C 233 3 
quick-lime is not endued with the power of abltia&ing 
from Bark the fixed air which it contains. 
Experiment X. furnilhes no other inference than 
this obvious one, that the decodion and infulion of 
the Bark are calculated only for immediate ufe. 
The cortex is a fubftance of a very fermentable 
nature, as appears from the Experiments of Mr. 
M’Bride 5 and when its adive parts are diffufed in 
water, and feparated from thole which are merely 
ligneous and inert, it is not to be wondered at, that it 
undergoes thofe changes, to which all vegetables, 
when favourably circumftanced, are liable. 
Warrington, 
.February i, 1764^ 
Thomas Percival. 
• ■ ■ r -• ■ i •' '**' 
f > • • • . • • • «- - 1 ■ . 'tyl? 
; ' i; ■ • : , ' j I 1 ,. 
Vol. LVII. H h Received 
