I 22] 



iirm coagulum like chalk, which was infoluble in wa- 

 ter, and, when well wafhed and freed of its acid, felt 

 gritty and was quite infipid in the mouth; this is 

 certainly a felenites formed by the earth of this ley 

 and the vitriolic acid. 



From this account of the Pitkeathly waters, it ap- 

 pears that lib. vi. unc. vi. dr. 3. fcr. 1. befides a few 

 grains of an abforbent or calcarious earth, contain 

 three drachms, 41 § grains (befides what was loft in 

 filtrating and other operations) of a faline matter, of 

 which near two thirds were fea fait, the reft a bittern 

 or fait with an earthy bafis, which concreted by the 

 force of fire into a yellow faline mafs, that runs 

 4bon per deliquium, and cryftallifes though with dif- 

 ficulty. 



The fmall quantity I had of refiduum prevented 

 *ny being able to determine with precifion, the exacl: 

 proportion of fea fait and of this bittern; neither 

 was If for the fame reafon, able to determine whether 

 this bittern or ley was all made up of a calcarious 

 marine, with an oily matter common to all waters, 

 or whether it contained tikewife a fal catharticum 

 amarum with a vitriolic acid. 



From the acid of vitriol forming an infoluble fe- 

 lenites with the earthy bafis of this bittern, it is evi- 

 dent, that at leafl all the earthy bafis is not a mag- 

 nefia, fuch as makes the bafis of the fal catharticum 

 amarum of the fhops, or what goes by the name of 

 Epfom falts, otherwife it would have formed a fait 

 jeafily fohible in water. 



IV. -Extr*8 



