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pate 3 Common salt Is an essential In tde dietary, l/l5 of an 02 . being toe minimum dally requirement* Since tde dally Intake is l/2 02 , ttils Is not a limiting factor. Salt is tde major inorganic constituent of blood serun^ and delps regulate tae neutrality of tde body. Its loss from tde body leads to dehydration and circulatory in- a efficiency with resulting condition of easy fatigue. These Cases A trU develop a salt hunger which automatically results in^ replacement of the salt contentjof the body. Great perspiration, and the development of acid or alkaline condition of the body results in the loss of salt from the body, Th^upplyihg of an^ abundance of salt hastens the restoration of these cases to the normal condition* Salt is the factor in the body fluids that most clearly records our early ancestral environment in the Cretaceous Sea. In the 400,000,000 f/60 years that have elapsed since our ancestors ventured on dry land the salt content of the ocean has almost tripled, but man and the other mammalian forms still carry the same salt content in the blood and other body fluids. An interesting example of tne importance of salt was demonstrated in the early part of this century. Weljh miners in the deeper workings perspired freely and lost much more salt from their bodies than was being replaced in the dietary# Since the body cannot make blood without salt, the volume of the b^lood was decreased and the circulation of the blood become fat Inefficient, interfering with thdir capacity for work ana frequently resulting in fainting or collapse while at work. The large amounts of water which they consumed resulted in the further loss of salt from the body. A small amount of salt added to the drinking water restored the salt content of the blood, increased the volume of the blood and the circulatory efficiency, and restored to these men the capacity fonproductive work.