C 3 01 ] 
but, when the Infufion grew cold, it loft Its Tafte 
and Smell, and the Water, after (landing fome time, 
became, without being filtred, as pale and clear as 
before 3 nor did the Mixture of it with Gil of Tar- 
tar, Oil of Vitriol, nor Aqua fort is, produce any 
Alteration in it. This Experiment, being repeated 
feveral times, by infuftng boiling Water on the fame 
Powder, was attended with the fame Effe&s, tho’ 
near two Months pafs’d between the firft and laft 
Infufions. The Powder, after the firft Infufion, ap- 
pear'd like Mud of two different Colours and Con- 
liftenciesj the upper Part being fofter, and of a 
lighter Colour, the under of a dark- brown, feeling 
hard like Sand. This Difference in the Colour and 
Texture of the Sediment remain'd in all the Infu- 
fions. 
A fmall Piece of the fame, and another of the 
biggeft Stone, being let fall into boiling Water, , 
funk immediately, and continued at the Bottom, 
without rifmg at all, tho' the Water was kept boiD 
ing a conftderable Time : Which fhews, that thefe 
Stones are fpecifically heavier than the Stone found 
in the Stomach of a Horfe, which Mr. Wat (on gives 
an Account of in the Thilof. Tranf- N°. 475- and 
alfo, that their condiment Principles are more firmly 
united together than thofe of that Stone 5 two Pieces 
of which, being let fall into Water almoft boiling, 
immediately funk, but rofe again, and continued 
alternately riling and linking a conftderable time : 
And, as that Gentleman obferves, the Powder of 
that Stone being infufed in boiling Water, the In- 
fufion., 
