[ 9 °° 3 
thirty-three grains j the third, only 1 6 grains. That 
it might be eftimated in what degree the folvent 
power of the Carlfbad water did exceed that of lime- 
water, the following experiment was tried. Three 
pieces of calculi, each exactly thirty grains in weight, 
were put into feparate phials. Upon one was poured 
fome frefh egg-fhell lime-water : upon the fecond, 
fome Carlfbad water : upon the third, fome of the 
urine of a perfon daily drinking thefe waters for the 
recovery of his health. Thefe phials were all placed 
in one of the canals, which carries off the wafte 
water from the baths : the degree of heat in this 
place was by Fahrenheit’s thermometer 96, much 
the fame as the heat of human blood. The lime- 
water, the Carlfbad water, and the urine, were 
changed every day, and the procefs continued for 
fourteen days. Upon the fifteenth, the remaining 
fragments of ftone were taken out of the phials, and 
weighed when dried. The piece macerated in lime- 
water had loft one grain : that in the Carlfbad water, 
fix grains : that in the urine, five grains. Accord- 
ing therefore to this experiment the folvent power of 
the Carlfbad water was fix times, that of the urine 
five times greater than that of the lime-water. 
The folvent power of medicated urine is of very 
great importance, and requires more particular atten- 
tion $ as our greateft expedations in diffolving the 
ftone in the bladder muft arife from that. It was 
therefore very fit that our author fhould inveftigate, 
as far as was in his power, the folvent property of the 
urine of thofe who drank thefe waters. He there- 
fore fufpended to the end of a funnel a fufftciently 
hard and compact calculus, weighing about an ounce. 
This 
