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History of-
"Evidence" shows sodium chloride was** important as long ago as when supposedly, mastodons were on the earth. Sodium chloride was being used before written history began. 2,700 years B.C there was published in China the Peng-Tzao-Kan-Mu, probably the earliest known pharmaceutical guide. (Sodium) A major part of this writing was devoted to a analysis of more than 40 kinds of salt, including descriptions of two methods of extracting sodium chloride and putting it in a usable form that are very much like our processes today.
Egyptian art from as long ago as 1450 B.C. records salt making. A couple of more recent examples are drawings of a 15th century French salt evaporation plant, a 16th century Persian picture of a Kurdish salt merchant and a 17th century Italian print offering instructions in distilling salt.
(N.N.) Salt was of very important economically. A trade in Greece involving exchange of salt for slaves made the expression, "not worth his salt." The......

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