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Excerpt from A Treatise on Ventilation: Comprising Seven Lectures Delivered Before the Franklin Institute, Philadelphia, 1866-68; Showing the Great Want of Improved Methods of Ventilation in Our Buildings; Giving the Chemical and Physiological Process of Respiration; Comparing the Effects of Th So great has been the change, that, in revising these Lectures and addin the Second Course for publication, it seems scarcely possible that two or three short years only could have passed since the general indifference and apathy, as therein expressed, should have existed. 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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