Excerpt from Concrete Houses Cottages, Vol. 2: Small Houses To those unfamiliar with the terms Portland Cement and concrete, a word of explanation seems necessary. Portland Cement is the name given to a mixture of limestone and cement rock which has been burned at a very high temperature and ground to a powder finer than flour. Concrete or artificial stone is produced by a mixture of Portland Cement, sand and crushed stone or gravel, varying in its proportions to meet the requirements. 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.