Excerpt from The Aquarium, Vol. 4: October, 1896 In localities where the water supply is limited, the manner shown in the next tank to the right is convenient. The foul matter is carried off at water level through the bottom of the tank by a standpipe. It is also taken from near the bottom. This standpipe sys tem has the advantage that the water level can be regulated by it, all being required is to slide the pipe up or down. A cap, in shape similar to a test tube, and of proper proportions to guarantee a free flow, reaching to within a quarter of an inch of the bottom, is supported over it either at the top of the pipe, as shown in the illustration, or at the bot tom by putting little feet to the cap. 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.