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Excerpt from Contributions From the Mineralogic Laboratory Regarding the genetic relationships of the members of this in teresting series, the writer can do little more than speculate. It is, however, quite apparent, from its position, which is always that of close proximity to the walls of the seam, that the pyramidal type occupies the lowest place in the crystal development, representing the oldest generation of calcite. It is equally certain that the scalenohedral type is predominant in crystals of the second gen eration which might possibly have been, in a measure, derived from the re-solution of the first generation of calcite. Between these limits we find a variety of expressions of crystal habit which, when considered with reference to the main facts above noted, leads us to seek for the solution of the crystallogenetic problem along several lines. It is the opinion of the writer that, in the case of the Union Springs locality at least, development in crystal habit is not dependent solely on chemical or physical differences in the crystallizing solutions, but is further complicated by the presence of external forces. 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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