( 135 ) 



never been heated. Thefe minute oblong faline particles were Ipread 

 in fuch quantities in the water, that I did not think any of them 

 had been diflblved in it. 



I let this water Hand for a time, in order to fee whether the par- 

 ticles which gave it a whitifli colour would fmk to the bottom ; but 

 the water remained turbid, and when I fufFered it to evaporate, there 

 were fo many minute particles left, that the whole fubftance ap- 

 peared white. 



This water, wherein I had fb boiled the calcareous matter, I kept 

 in my clofet during the whole winter, and then again examining it, 

 I fawthe thin oblong particles before mentioned (which I judged to 

 be fixed jalts) lying in as great abundance as if the Calx had been 

 newly extraded from the perfon's body. 



From theie obfervations, I concluded, that this calcareous fub- 

 ftance, when in any part of a human body, cannot, by any medi- 

 cine, be diflblved. 



A small quantity of this Calx or Chalk, taken from the fame per- 

 fon, I put into a fmall box well clofed, and kept it for fome months 

 in my clofet, I then put it into a new glafs, and gradually expofed 

 it to fo fierce a fire, that the glafs became red hot : I then perceived 

 that, by the force of the fire, a thin pellucid liquor was extracted, 

 and many globules of a yellow colour, but many of them afterwards, 

 uniting together, exhibited a red appearance ; but as foon as the co- 

 ver of the glafs, to which the thin tranfparent liquor and oil adliered, 

 began to cool, all the liquor coagulated in an incredible number of 

 faline particles, mofi; of which were twenty-five times longer than 

 broad, and were of various fizes, both ends terminating in points, 

 as repi-efented at Jig. 18, AB C. 



Thebil which by the fire was extraded from this fubftance, and which 

 while warm was a liqviid, I faw was now changed into a folid fub- 

 ftance, which I concluded was certainly occafioned by the multitude 

 of faline particles coagulated in it : thefe particles in the oil were 



