Every one knows that mineral coal is dug out from the crust of the earth. But the question frequently is asked concerning it, How and under what conditions was it formed? In order to answer this inquiry it is necessary to have recourse to the science of geology. A brief review of the geological history of the earth’s crust will be of prime importance, and it will not be inappropriate to go back to the origin of the earth itself. But no man can begin at the beginning; that is too far back in the eternal mists; only the Infinite Mind can reach to it. There is a point, however, to which speculation can journey, and from which it has brought back brilliant theories to account for the existence …
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