This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1886 Excerpt: ...to 2 gallons per square foot per hour. If this was so, it seemed evident from his experiments that the engineer might be called upon to deal with suspended particles smaller even than micro-organisms, and for whose elimination sandfiltration was useless. The River Plate was a delta-forming river, and like all rivers of that class, its waters are highly charged with suspended matter. Simple repose for twenty-four hours was sufficient in most cases to allow of the deposition of the greater part of this suspended matter; but there remained behind matter in suspension in a state of most minute subdivision, and giving a yellowish opalescent character to the water, which it appeared almost impossible to get rid of. Passing it through three folds of fine filter-paper had no effect on...