as 4$o LIME-WATER, AND SOAP. 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 grains. 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¬ ments. 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 near