exiraBhtg Marine Salt from Sea Water. iij 



This fait is procured during the cold weather in winter, 

 from the pickje.or brine in its concentrated ilate, and the fame 

 refult will enfue, whether we have reconrfe to the procefs 

 antecedent or fubfequent to the cryflallization gf the tea falc 

 Jlaving procured a quantity of pickle, fufficiently infpiilated in 

 the fait, it is to be e'xpofed to the cold weather in the vats dur- 

 ing the winter, from the eiJecls of which the fait will be found- 

 to fhoot into irregular cryftals, and precipitate to the bottom. 

 In order to purify this fait, it mufl be taken out, put into a 

 copper boiler, being firfl half filled with warm frefh water, 

 with which the fait is to be djifolved and boiled for fome time. 

 The folution, after (landing an hour or two in a wooden veffel 

 for the faeces to fvcbfxde, (KovlU be poured ofFfrom the fediment 

 into coolers, where the fait will immediately for m, into p erfed 

 cryftals ; fhould the fait not be quite pure, nor affunie the 

 form of regular cryftals, it may be rediffolved, and the opera- 



zation of botli marine fait 



peated. After tlie cryflall 



and fal glauber, there remain? upon the floor of the fait 



faline bitter liquor, called mother, lye or bittern. This 

 liquor has commonly been thrown away as ufelefs ; but the 

 workmen fhould be apprifed that it will yield both a neutral fait 

 and magnefia alba. ^If this bittern be fet by in a cold place 

 for fometime in a leaden ^^M, a quantity of glauber fait, be- 

 fore mentioned, will fhoot j and if the remainder of the bit- 

 tern be gently evaporated farther, a frefh quantity pf the fame 

 kind of fait will appear 5 but if the bittern be haflily evaporated 



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