[ 449 ] 
The mineral Virtue in this Water Teems to be 
much like that of Cheltenham , in its (hooting into 
very bitter, regular, oblong Chryftals, which are, on 
that account, called nitrous ; tho' they are not a true 
Nitre; for neither thefc, nor thofc of Cheltenham^ 
will deflagrate or flafh in Touch-Paper, nor on burn- 
ing Charcoal, as true Nitre will do ; fome of which 
ftill retain their Form and Firmnefs for 1 7 Months 
fince they were chryftallized ; whereas the chryftal- 
lized Salts of feveral other purging Waters have crum- 
bled, and in a great meafure wafted, away in much 
lefs Time: A greater Proportion of the Salts of 
JeJfop's Well , (hoot into oblong Chryftals than thofc 
of Cheltenham j and its Water alfo gives a ftronger 
green Tin&ure, with Violet flowers. The purging 
Quality refldes chiefly in thefe chryftalline Salts, and 
a fmall Proportion of common Salt ; fome of which 
there is in all thefe mineral Waters. 
The Proportion alfo of its earthy calcarious Mat- 
ter, is but--} Part of it; which, like that of Chel- 
tenham , is but little, in comparifon of the much 
greater Quantity of it in other purging Waters: It 
is alfo foft and impalpable, like that of Cheltenham , 
and not har(h and coarfe, as it is in fome other purging 
Waters. 
And as the Quantity Of purging Salt in this Water 
is confiderably greater than in any other, fo it is found 
by Experience, that, proportionably a lefs Quantity 
of it fuffices, which makes it fit the better on the 
Stomach. It is alfo obferved to exhilarate thofe who 
take it. 
It was obfervablc of the Sediment of feveral of 
thefe Waters, that, when dried, and while hot, 
there 
