372 ESSAYS ann OBSERVATIONS 
ART. XII. 
Of the various Strength of different Lime» 
waters, by Ropert Wuytrt, M.D. 
F. R.S. Fellow of the Royal College of Phy- 
ficians, and Profefjor of Medicine in the U- 
niverfity of Edinburgh. i 
HE Reverend and ingenious Dr Ste- 
phen Hales, having informed me, in 
a letter dated May 1751, that he had found 
the ftrength of lime-water much increafed, 
by pouring it a fecond time on quick-lime, 
frefh from the fire; I thought it might be 
worth while to’ make a few experiments, 
in order to determine, with fome degree of 
certainty, the different ftrength of different 
lime-waters; from thefe experiments it ap- 
peared, that lime-water acquired a confider- 
able addition of ftrength by being poured on 
» quick-lime newly taken from the fire; and 
that the firft water got off quick-lime, was 
fenfibly ftronger than the fourth and fuc- 
ceeding ones *. 
On 
* Effay on the virtues of lime-water, &c. p. 38. 39. 
