( 55 ° ) 
What Experiments M. Bolduc made with the Bit- 
terfiy fent him by that Gentleman, I do not remember 
to have met with, in any of the fucceeding Memoirs. 
Dr. Seipp, in his Defcription of the Fyrmont Waters, 
?age 127, fays, that the common Englijb purging Salt, 
which is fold in great (Quantities in Germany, under 
the Name of Epfom Salt, is not prepared from the Ep- 
fom Waters, but is made in London from common Sea 
Salt, and Oil of Vitriol. 
In the fame Fage he fays, that the Salt obtain’d from 
the Pyrmont Waters will part with its own acid Spirit, 
upon pouring on the 0/. PltrioL which the Sal Mirahile 
and the Englijh purging Salt will not. By this Means 
he diftinguifhes the firft Salt from the two la ft. 
Dr. Quincey, in his PraleBiones Pharmaceutics, pub- 
lifh’d fince his Death, fays, there hath lately been con- 
triv’d a Salt from the Mineral Purging Waters, made 
by Evaporation, Filtration, and Cryftalization. It 
was firft entitled Sal Mirahile, or Sal Cathartieum Ama- 
rum ^ but it is now fo fcandaloufly counterfeited, that 
it is little elfe than common Salt dififolv’d and recry- 
ftalized. 
Before I enter into the Account how this Salt is 
made, it may not be amifs, firft, to fay fomething of the 
genuine Salt that has been made from the bitter purging 
Waters, of which the learned Dr. Grew was the firft 
who attempted the making it at Epfom, Some Years af- 
ter, feveral other bitter purging Springs were found in 
different Counties, and Salts in fmall (Quantities were 
boyl’d up from them, but from no Place, nor all the Pla- 
ces put together, in fuch large (Qaantities, as from the 
Springs on one fide of Shooters-Hill in about theYear 
1700, which were then in the Poffeffion of thofe two 
ingenious Chy mifts, Mr. George and Mr. Francis Moult ^ 
