[ S5 ] 



a few minutes after the nutgall. In this procefs a very copious' 

 precipitation enfues. 



Flowers of fulphur and magnefia are to be mixed with water 

 in the proportion of four drachms of each to a quart of water. 

 They fliould previoufly be ground together in a glafs mortar, 

 for the purpofe of breaking all the fmall lumps of fulphur 

 which would otherwife float on the water. They fhould then 

 be gradually wetted with the water, and worked up with it 

 by the hand. When fo mixed, as that none of the fulphur 

 floats, the whole is to be poured into a clofe vefl^el, in which 

 it may conveniently be fliaken two or three times every day for 

 three weeks. After that time it is to fettle for two days, and 

 then the liquid to be racked off fine. The fame ingredients 

 will impregnate the like quantity of water two or three times, 

 to an equal degree of ftrength, in a fpacc of time fomewhat 

 Ihorter than the firft. 



N. B. I have not found that the fineft, light, white, 

 magnefia, fticceeds as well as a darker and heavier fort. 



The liquid thus racked off contains in folution what may be 

 named a magncfiac liver of fulphur. 



Some powdered nutgalls being mixed ^\ith this liquid, and 

 afterwards fome alum, the water is by their ftiptic quality 

 'rendered incapable of holding the magnefiac liver of fulphur 

 in folution : the latter is therefore precipitated, but not de- 

 composed. 



One 



