[ n ] 



in the yellow ley mixed with the Glauber fait. 

 Having accidentally added a folution of cauftic alkali 

 to this mixture of the yellow matter, and vitriolic 

 acid, it emitted immediately a ftrong fmell of hepar 

 fulphuris. This yellow matter I take to be com- 

 poied of a Glauber fait, and a yellow oily matter 

 common to almoft every water, though perhaps in 

 larger proportion in this than in many others ; but 

 whether it contains a pittance of fea fait, I think is 

 doubtful i and what makes me ftill doubt the more, 

 is my having fince evaporated 44 ounces of the water, 

 from which I obtained gr. x. of refiduum, when the 

 water was at laft evaporated to drynefs, which I threw 

 likewife into diftilled water, and the molt, of it pafTed 

 the filtre,. and concreted into pure cryfbls, refem- 

 bling thofe of Glauber fait, leaving but a very 

 finall pittance of a yellow oily matter behind. How- 

 ever, it will be neceilary to have a pretty large quan- 

 tity of this laft refiduum, to determine with precifion 

 the nature of every ingredient in its composition, and 

 the exact proportion of each. 



Having tried as many experiments as I could, with 

 the fmall quantity of this yellow matter I had, I laft 

 of all examined the coffin through which the falts 

 and it had pafTed. After it was dry, I found that it 

 had increafed gr. ii. in weight, and that it was co- 

 vered in the iniide, with a yellowifh powder. When 

 part of the paper, with this powder, was lighted with 

 a candle, and the flame extinguifhed, it fmelt ftrong 

 of fulphur; and, on rubbing a milling with another 

 bit of the paper, it immediately tinged it yellow, as 

 pure fulphur would have done. From whence, I. 

 think* we have reafon to. conclude, that this powder 



€On*~ 



