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.