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By Rock-Salt *, or native Salt, is underftood all 
Salt dug out of the Earth, which hath not under- 
gone any artificial Preparation. 
Under the Title of Bay-Salt may be ranked all 
Kinds of common Salt extracted from the Water, 
wherein it is difiolved by means of the Sun’s Hear, 
and the Operation of the Air ; whether the Water, 
from which it is extracted, be Sea- Water, or natural 
Brine drawn from Wells and Springs, or Salt Water 
ftagnating in Ponds and Lakes. 
Under the Title of white Sale, or boiled Salt, 
may be included all Kinds of common Salt extracted 
by Co&ion from the Water wherein it was difiolved; 
whether this Water be Sea- Water, or the fait Water 
of Wells, Fountains, Lakes, or Rivers; or Water 
of any fort impregnated with Rock-Salt, or other 
Kinds of common Salt. 
The firft of thefe Kinds of Salt is in feveral Coun- 
tries found fo pure, that it ferves for molt domeftic 
Ufes, without any previous Preparation, Triture ex- 
cepted. But the Englijh follil Salt is unfit for the 
Ulcs of the Kitchen, until by Solution and Co&ion 
it is freed from feveral Impurities, and reduced to 
white Salt. The Britijh white Salt alfo is not fo 
proper as feveral Kinds of Bay-Salt for curing Fifh, 
and fuch Flefh-Meats as are intended for Sea Pro- 
vifions, or for Exportation into hot Countries. So 
that, for thefe Purpofes, we are obliged, either 
wholly 
* By Rock-Salt , or Sal Rupium , the antient Chemifts mean Salt 
adhering to the Rocks above the high Water Mark, being there 
lodged by the Spray of the Sea, evaporated by the Heat of the Sun ; 
which is the pureft Salt of all for chemical Ufes, and is to be had off 
the Rocks of Sicily, and feveral Illands in the Wejl Indies. 
C. Mortimer, 
