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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
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Harold V. Brown (1965) studied this question.
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