[ 232 ] 
the fixt air which they contain. This method of 
folution he endeavours to apply to many valuable 
purpofes in medicine, and hath deferibed feveral 
iifeful and curious procefles for obtaining ftrong and 
elegant tindures of the mod adive drugs, by means 
of quick-lime. The firft s part of the Xth Expe- 
riment, ynutatis mutandis , was borrowed from him.; 
and it was hoped, that an efficacious and palatable 
infufion might with tolerable expedition be made, 
by the procefs which he has laid down. But the 
l'uccefs of my Experiment was by no means anfwer- 
able to the plauiibility and ingenuity of the theory, 
which induced me to attempt it. The infufion, after 
landing twelve hours, the time preferibed by Mr. 
Mc’Bride, was but weakly impregnated with th« 
Bark ; and when the maceration had been continued 
forty-eight hours, it by no means equalled in ftrength 
the preparation deferibed Experiment IV. It appears 
therefore that quick-lime, whatever its effeds may 
be upon other medicines, neither quickens nor in- 
creafes the folubility of Bark in water ; and it com- 
municates to the infufion a tafte which is intolerably 
naufeous and difagrceable. That the chalybeate folu- 
tion ffiould produce no change in the colour of thefe 
preparations, is agreeable to the laws of eledive attrac- 
tion. For the acid of vitriol, having a ftronger 
affinity with abforbent earths than with metallic 
fubftances, forfakes the iron with which it was com- 
bined, and unites itfelf to the quick-lime. Hence 
arofe the yellow ochry fediment, taken notice of in 
the Experiment. As the refiduum, after filtration, 
did not effervefee with oil of vitriol, it is evident that 
quick- 
