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The animal system contains an essential constituent of the brain and nervous substance, of the blood discs, of the muscles, of the albuminoid compounds, of the spermatozoa, of the egg, in a word, of the most important part of the organism—a phosphide element which has not yet been completely analyzed or isolated as a chemic compound, which has been called by many different names, but which is now clearly recognized as distinct from the phosphatic element. The essential characteristic of this phosphide element is that the phosphorus is contained in it in a state of molecular combination with the other chemic principles, and is not yet oxidized, while in the phosphatic element, such as the phosphate of lime in the bones, it is completely oxidized. This phosphide element is, of all the materials of the system, the one which has the greatest affinity for oxygen, and seems to be in
GARDNER RW. THE ETIOLOGY OF PHTHISIS.A SUMMARY OF SCIENTIFIC POINTS INVOLVED IN CHURCHILL'S THEORY.. JAMA. 1899;XXXII(9):479–483. doi:10.1001/jama.1899.92450360029001p
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