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The Role of the Minerals in nutrition. 7 I Radio Talk, KUSD MQv* 13, 1935 E*H. Shaw Jr* The mineral needs of man are a part of his evolutionary in¬ heritance. Four hundred million years ago, tae evolutionary anc¬ estors of man Jrwam in the Cretaceous Sea and crawled in the prl- T^jreval slime. At that time,the blood and other bod,/ fluids of our lowly ancestor were in equilibrium with the surrounding salt water and contained the various salts and mineral elements in the same con¬ centration as tne surrounding sea water. Since tae body is very sensitive to changes in salt concentration, the survival of tae first primitive form to venture on dry land depended on ills ability to maintain tills normal concentration of salts in the blood and other body fluids. Our evolutionary ancestor solved this problem and transmitted this power of maintaining the normal concentration of salts in the blood as an hereditary characteristic to ills offspring This was so successful, that even at this late date, 40Q,GGQ,QGG years later, we still carry in our blood stream a miniature model of the cretaceous sea, our homeland. In the same way that emigrants frequently carry to their new homes a bit of the soil of their native country. Although we are now fully adapted to life on dry land, per¬ haps some of us wish it were not so dry year after year and would wel¬ come an little more moisture. as a matter/^ of fact, we are not com¬ pletely adapted to life on the land, but each and every one of us still treasures the memory of the free and easy life in the ocean. E During our prenatal life, we grow and develop in a fluid envlommeut a tiny bit of the cretaceous sea stored up within the placental mem¬ branes, and during thfcse montfcu^ve relive our evolutionary alstory, going through all the changes between an aquatic animal and a land animal.