Excerpt from The Influence of Fluxes and Non-Fluxes Upon the Change in the Porosity and the Specific Gravity of Some Clays Fusion considered from the general standpoint of sili cates is sharply defined only for some definite minerals; even in many silicates it is a more or less gradual transi tion from the solid to the semi-liquid or liquid condition, and therefore, in a heterogeneous rock, like clay, even though all of its constituents were reduced to uniform extreme fineness, fusion must, in the nature of the case, cover a considerable temperature interval. 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.