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: ...forms of insect life as Daphnia pulex, anguilula, 4c., have been noticed. But in no single instance have the water-tests, either chemical or biological, given any grounds for the belief that the Berlin supply contained any matters injurious to health. That is to say, that none of the micro-organisms have, on pathological grounds, revealed any indications of a dangerous character. The report contains very numerous tables of analyses and six sheets of diagrams. Mr. Higgin. Mr. G. Higqin observed, in reference to filtration through sand, that seven or eight years ago he had occasion to make a series of experiments in filtration, with the object of ascertaining the best method of purifying the water of the River Plate, which was used for the supply of Buenos Ayres.1 It was stated in...