| | | 4.  Nitrogen, a gas, is also part of all muscle, blood, | | | and bone; weighing | 4 | 14 | 0 | | | 5.  Phosphorus, a solid, found in brain and bones, | | | weighs | 1 | 12 | 25 | | | 6.  Sulphur, a solid, found in all parts of the body, | | | weighs | 0 | 8 | 0 | | | 7.  Chlorine, a gas, found in all parts of the body, | | | weighs | 0 | 4 | 150 | | | 8.  Fluorine, supposed to be a gas, is found with calcium | | | in teeth and bones, and weighs | 0 | 3 | 300 | | | 9.  Silicon, a solid, found united with oxygen in the | | | hair, skin, bile, bones, blood, and saliva, weighs | 0 | 0 | 14 | | | 10.  Magnesium, a metal found in union with phosphoric | | | acid in the bones | 0 | 2 | 250 | | | 11.  Potassium, a metal, the basis of potash, is found | | | as phosphate and chloride; weighs | 0 | 3 | 340 | | | 12.  Sodium, a metal, basis of soda; weighs | 0 | 3 | 217 | | | 13.  Calcium, a metal, basis of lime, found chiefly in | | | bones and teeth; weighs | 3 | 13 | 190 | | | 14.  Iron, a metal essential in the coloring of the | | | blood, and found everywhere in the body; | | | weighs | 0 | 0 | 65 | | | 15.  Manganese. } Faint traces of both these metals | | | } | | | 16.  Copper metals.} are found in brain and blood, | | | but in too minute portions to be given by | | | weight. | | | |------|-----|----- Total | 154 | 0 | 0

The second table gives the combinations of these elements; and, though a knowledge of such combinations is not as absolutely essential as the first, we still can not well dispense with it.  The same weight—­one hundred and fifty-four pounds—­is taken as the standard.

COMPOSITION OF THE BODY.

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