I 
1 5 2 &z/ Polychrejhim, 
larger Price for this, on its being recom¬ 
mended as a much better purging Salt 
ABon Salt, or what I bought for fuch, 
appeared on Examination juft like the above* 
but without the Figures b i g. 
CHAP. XXVII. 
Sal Polychrestum. 
V - < 
A Solution of this Salt when heated be¬ 
gins to (hoot near the Edges of the 
Drop, in Ramifications, as at a y Plate V. or 
* Dr. Quincy, in his Engliih Difpenfatory, remarks 
what was then fold for the Salt of Epfom Water , as an 
abominable Cheat, (<vid. Edit. 8th, page 355.) He informs 
us, “ that Dr. Grew, having found by Experiment, that a 
“ Gallon of Water would, on Evaporation, afford about 
two Drams of Salt, endued with the cathartic Quality of 
the Water, gave an Account thereof in Latin to the Royal 
s ‘ Society. Upon which a certain Chemifl pretending to make 
et large Quantities for Sale, put off a fi&itiotts Preparation 
for the true Salt of Epfom Purging Waters ; and others 
“ attempting the fame Thing, the Price was loon brought 
“ fo low, .that inftead of one Shilling per Ounce, under 
which the true Salt could not honeftly be made, their fidli- 
“ tious Kind was fold at not much above 30 Shillings 
1 ‘ per Elundred Weight, which little exceeds three Pence 
“ per Pound.” And Dr. Brownrigg allures us, in his 
excellent Treatife on the Art of making common Salt, page 
SB, that all the Salt now vended under the Name of Ep¬ 
fom Salt, is prepared intirely from the marine Bittern, at 
the Salt Works nigh Newcafle, and at thofe at Lymington- 
and other Parts of Hampjhire ; which Bittern is a faline 
Liquor, of a fharp and bitter Tafle, left at the Bottom of 
the Salt Pans after the Salt. is.made and taken out. I id. 
page 62. 
in 
