[ 32 ] 
firm coagulum like chalk, which was infoluble in wa- 
ter, and, when well walhed and freed of its acid, felt 
gritty and was quite infipid in the mouth j 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 
foon per deliquiutn, and cryftallifes though with dif- 
ficulty. 
The fmall quantity I had of refiduum prevented 
my being able to determine with precifion, the exa<ft 
proportion of fea fait and of this bittern; neither 
was I, 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 likewife a fal catharticum 
amarum with a vitriolic acid. 
From the acid of vitriol forming an infoluble fe- 
ienites with the earthy bafis of this bittern, it is evi- 
dent, that at leaft all the earthy bafis is not a mag- 
nefia, fuch as makes the bafis of the fal catharticum 
amarum of the (hops, or what goes by the name of 
Epfom falts, otherwife it would have formed a fait 
eafily foluble in water. 
IV. Extraft 
