Abstract
The historical development of industrial hygiene is presented with silicosis as the unifying theme. The development of protective, evaluative, and control measures is followed.
Silicon (L. silex, flint) … Next to oxygen, the most abundant element; characteristic of all abundant and important rocks except carbonates. It makes up about one-fourth of the crust of the earth. Silicon is not found free; it occurs chiefly as the oxide, silica (SiO2) (sand, quartz, rock crystal, amethyst, agate, flint, jasper, opal, etc.)1
