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Excerpt from Clays of Economic Importance in the Federated Malay States The word 'clay' is from the anglo-saxon 'claeg, ' derived from the Teutonic verb kleven, ' meaning to stick or adhere, but the most prominent property of clay is not its adhesiveness, but its plasticity. Most definitions agree in stating that it is a rock which, when mixed with water, can be easily moulded into shape which it retains when dry; and further, that when heated to a sufficiently high temperature it loses its plasticity and becomes hard. A plastic earth which did not harden on heating could, however, be called a clay and perhaps one of the best definitions is that which states that clay is one of those natural earthy materials the most prominent property of which is plasticity when wet. Mr. Searle1 states that no entirely satisfactory definition of 'pure Clay' exists, and the use of this phrase must be understood to refer to a hypothetical rather than to an actual substance, as the clays which correspond most closely to the formula given (al 2 OS 2 Si O, 2 H 2 O) are deficient in plasticity. 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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