Bauhaus-Universität Weimar

a heat of 96 degrees, the dried calculi had loft of their weight 
follows : the firft 3 grains, the fécond 18 grains, and the third 14 
Although I make no doubt that Dr Springsfeld, who appears to 
be a man of candour, as well as learning, has faithfully related the 
event of the experiments which he made; yet either the lime- 
water he ufed muft have been very weak, or fome other miftake 
mull have happened in his experiments: for in all the nume¬ 
rous trials I made, about 15 years ago, of lime-water as a folvent for 
the Rone, I always found its diifolving power much greater than 
it appears in Dr Springsfeld’s experiments. And as in thefe trials dif¬ 
ferent urinary flones were ufed, it can fcarcely be imagined, that it 
was owing to the peculiar hardnefs of Dr Springsfeld’s calculi, that 
the lime-water made fo little impreffion on them. However, to be 
Rill further fatished of this matter, I made the following experi¬ 
1.1 put a piece of a very hard calculus, which I fhall call x9 
weighing 80 grains, in oifter-fhell lime-water, renewing the lime- 
water every day, and keeping it in a heat between 90 and 106 de¬ 
grees of Fahrenheit’s fcale. After 20 days, I took out the calculus . 
and having fet it by for fome days, till it was become quite dry, 
I brufhed away all the rotten part of it, which was reduced to 
a kind of chalky powder, and found that the undiffolved part of 
it weighed 57 grains. 
2. At the fame time a piece of another calculus, z, weighing 15 
grains, was, after a like infufion of 20 days in oifter-fhell lime-wa¬ 
ter, reduced to 10 grains. 
3.1 put a piece of z, weighing 14 grains, in a folution of half 
an ounce of the internal part of Spaniih foap in nine ounces of wa¬ 
ter, and every third day renewed the folution, which was kept in a 
heat of about 60 degrees. After 14 days, I found the undiffolved 
part not to exceed 11 grains. 
4. A piece of a white chalky calculus,7, weighing 30 grains, had 


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