Excerpt from University of Illionois Bulletin, June 15, 1907, Vol. 4: Effect of Repeated Freezing and Thawing on Brick Burned to Different Degrees of Hardness, 1906-1907 On account of the diverse forms of the grains, these tubes are not uniform throughout their length, but consist of a series of triangular cavities connected at their smaller ends. Owing to the variation of the diameters of the grains, these cavities are not uniform in size, but are smal ler or larger as the grains increase or diminish in size. 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.