(370 
tlie fame \vlui rliis Creinor ^ the red: is all Salt, buf: 
condfts of two forts, one a muriatick Salt, the other 
which is proper or peculiar to thefe Waters. 
In the Epfom W atcr, the muriatick Sait is about a 
20th Part of the faiine Mixture , in the Dulwich it is in 
a greater Proportion, and the fame in feveral others it is, ‘ 
both in its acrimonious Tafte and Figure of its Cry- 
ftals, not unlike to common Salt. The other Salt is 
that which he fays is particular or proper to the purg- 
ing Waters, and is [made by Evaporation and Cryft.a- 
lization. In this Preparation, firft the earthy or plai- 
ftery Part is to be feparated, next the muriatick Salt, 
and, laltly, a brown and dark Liquor from the proper 
Salt of the Waters. 
And in the 4th Chapter of tlie fame Part, having 
fliewii the Difference of the Figure betwixt the Cry- 
Ifals of this Salt and thofe of Alum, he goes on. Nei- 
ther is there any better Ground to account the purging 
Salt a Species or common Salt, from which" being per- 
fedly freed, it differs as much in Tafle as from Alum. 
And in the fame Chapter, he fays it will appear, the 
bitter purging Salt, although it hath fome Qualities in 
common with other Salts, yet is truly, or fpecifically 
different from them all. Thus far Dr. Grew. 
Now I cannot fee any Thing in this Account, but 
what will, confideratis confiderandis^ very well agree 
with the purging Salt from the Sea Water. 
For firft, there is an earthy or plaiffery Part contain’d 
in thefe Waters^ and this muft be feparated. The very 
fame is in the Sea Water, and is precipitated in the 
Boiling them down, as has been obferv’d, and by the 
Operators is called Scratch. 
Next there is a muriatick Salt allow’d to be in 
thefe Waters- in fome more, in lome lefs, and this is • 
likewife 
