Excerpt from Petrography of the Fuller's Earth Deposits, Olmstead, Illinois: With a Brief Study of Some Non-Illinois EarthsThe term fuller's earth is herein applied to any clay that has a high capacity for removing color from animal, vegetable, or mineral oils. NO particular composition, texture, or genesis is implied by the term, although decolorizing ability may be related to these factors. The name was derived from the original use of earth for removing grease and fat from woolen cloth during the process of fulling.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.