PHYSICALand LITERARY. 387 



ved in it ; in all thefe three trials, a white 

 powder precipitated. 



i;2. On September ifl, I poured a cho- 

 pin or Englilh quart of this water into a 

 clean white ftone-bowl ; and covered it 

 with a piece of paper, to keep out the 

 duft. 



On the 2d, there was precipitated a 

 brown powder, like brick duft ; and, on 

 the furface of the water, there were many 

 fliining fpangles of a copper-like colour. 



On the 3d, there was more of the 

 brownifh powder at the bottom ; all the 

 parts of the bowl, which were covered ' 

 with the water, were tinged yellowilh ; 

 3. pellicle covered the furface of the water, 

 and all the fpangles were gone. 



On the 6tb, the fliarp aluminous tafte 

 was pretty ftrong, but the chalybeate 

 tafte much weaker ; there feemed to be no 

 more of the brownifli powder at the bot- 

 tom than there was on the 3d ; the yel- 

 low fubftance that adhered to the bowl 

 was alfo thicker, and had a fmooth oily 

 look ; the pellicle on the top had now ac- 

 quired the thicknefs of writing-paper ; ic 



waa 



