£ *0] 



part, or black earth, mould feem to be of the ab- 

 sorbent kind, the other an infoluble earth, or a fe- 

 lenite. Whether the firft earth was originally dif- 

 folved in the water by means of air, or whether it was 

 only light particles of earth, which had been blown 

 into the well, and only fufpended, I mail not take 

 tepon me to determine ; hut, in looking at the water 

 of another bottle, which was not ufed in this ex- 

 periment, I obferved, that although the water ap- 

 peared quite tranfparent, yet that it contained fome 

 particles of light earth fufpended j however, thefe 

 might have been originally diifolved by means of air 5 . 

 but feparated afterwards. 



The remaining water was put into a fmall bafon, 

 and fet again on a fand heat to evaporate $ when it 

 was reduced to about three ounces, a pretty firm 

 pellicle appeared, and it was fet in a cool place for 

 twenty-four hours ; at the end of which time, it was 

 examined j and, beiides the pellicle which had formed 

 on the furface, a thin white lamellated and granu- 

 lated cruft had formed, and attached itfelf to the 

 bottom and fides of the bafon. Thefe being all fe- 

 parated, the whole was thrown into a filter j and 

 when the water had palled, and the coffin was dry, 

 Inere was found remaining gr. xi. of a very white, 

 inlipid gritty fediment. This fediment in the mouth 

 feels gritty, and has no tafte, being quite infipid -, 

 when fome of it was put into a glafs with diftilled 

 water, and a few drops of oil of vitriol mixed with 

 it, a very flight effervefcence enfued ; but almoft the 

 whole remained undhTolved 3 and appeared to be fe- 

 lenite. 



The 



