Download or read book The Annals of Hygiene, Vol. 2 written by Joseph F. Edwards and published by Forgotten Books. This book was released on 2017-11-27 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Annals of Hygiene, Vol. 2: The Official Organ of the State Board of Health of Pennsylvania; January-December, 1887 I have been asked many times the question why the Romans have spent such an amount of time, labor and money in building these prodigious channels across mountains and valleys, tunnelling the former and bridging over the latter with tunnels and bridges many miles long; when it would have been so easy and so economical to lay down pipes, following at a moderate depth the undulations of the country. In other words, I have been asked whether the Romans have known or not the use of syphons. To be sure they knew it, in theory and in practice. 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.