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Excerpt from Nomenclature of the Megascopic Description of Illinois Coals It should be understood that comparison of brilliance of luster of different ingredients should be made between vitrain and clarain in the same coal and not between heterogeneous vitrains and clarains. The difference is a relative one only, the relation being one that exists in the same coal bed or in the same block of coal after removal from the bed. The relative brightness of vitrain and clarain in the same coal is likely to depend upon the amount of fine or micro-vitrain present in the clarain. At any rate a clarain composed of a large proportion of such micro Vitrain will be bright. Ou the other hand, even without mega scopic evidence of the presence of vitrain, clarain is bright. The explanation in microscopic terminology is that clarain is com posed of a predominating proportion of translucent material, whether this material consists of anthraxylon or of attritus. This is a fundamental cause of their megascopic appearance, but is of course not discoverable megascopically. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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