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My method is founded on the fecond principle. Its fim- 

 plicity, and the probability that it is fimilar to that purfued by 

 nature in the formation of fome of the moft powerful ful- 

 phureous waters, induced me to make trial of it. The fame 

 confiderations may poflibly be deemed by gentlemen of the 

 medical faculty a recommendation of this artificial medicinal 

 water for trial in the courfe of their pradice. 



The method is this : Mix fulphur and magnefia, in the 

 proportion of four drachms of each, with one quart of cold 

 water. Care mult be taken that every particle of the fulphur 

 and magnefia be made fo wet as that none fhall float. Pour 

 this mixture into a veffel in which it may be conveniently 

 fhaken feveral times every day during the fpace of three 

 weeks. Let it then fettle for two days, and rack off the 

 Liquor. This, firft racked off from the fulphur and magnefia, 

 will be of the colour of water, and free from any bad fmell. 

 If a like quantity of water be poured into the veffel in which 

 the magnefia and fulphur remain, and be frequently fhaken, 

 it will in a fortnight be found to be as ftrongly impregnated 

 as the former ; and in like manner may many fucceffive im- 

 pregnated liquors be obtained ; but they will differ from the 

 firft in having a yellow tinge and emitting a foetid odour. 

 However, in their component parts and medicinal properties, 

 all thefe impregnated liquors feem to me, from the fials I have 

 made of them, perfectly to agree. Thefe liquors almoft inftantly 

 change the colour of filver. They are moft effedualiy decora- 

 pofed by powdered nutgalls and alum, the alum being added 



a few 



