Articles on the filtration of water, giving accounts of experiments at the Lawrence Experiment Station, and records of the operation of the Lawrence city filter. These experiments are directed principally to the removal of bacteria from sewage-polluted waters. —— Jour. New England Water Works Assoc., XI., p. 277. Removal of Iron from Ground Waters. A description of certain experiments. FOWLER. Jour. New England Water Works Assoc., XII., p. 209. The Operation of a Slow Sand Filter. A most helpful and thorough description of the operation of sand filters at Poughkeepsie for a long period of years. FULLER. Water Purification at Louisville. D. Van Nostrand Co., 1898. A report upon a series of most exhaustive experiments carried out at Louisville, directed principally to the clarification of excessively muddy waters. Contains a full account of methods of coagulation, and of experiments with the electrical treatment of water. —— Report on Water Filtration at Cincinnati. City document, 1899. Account of experiments with sand filters, with and without coagulants, and with other processes applied to the Ohio River water at Cincinnati. GILL. Filters at Muggel. Proc. Institute of Civil Engineers, 1894-5; vol. 119, p. 236. A description of the new vaulted filter plant designed by the author for Berlin, Germany. Plans and views. GOETZE. Journal für Gasbeleuchtung und Wasserversorgung, 1897, p. 169. Selbstthätige Wasseraustrittsregler besonders für Filter. A description of the automatic regulating device for filters used at Bremen. —— Zeitschrift des Vereines deutscher Ingenieure, XXX. Reinigung des Trinkwassers in Bremen durch mehrmalige Sandfiltration. A description of the method of double filtration used at Bremen, giving results obtained in full. No drawings. GRAHN. Journal für Gasbeleuchtung und Wasserversorgung, 1895. Water purification plant at the city of Magdeburg. A description of the old plant, and the changes which have been made in it to increase its capacity, and make it conform to the requirements of the German official instructions regarding filtration. Many illustrations and plans. HALBERTSMA. Journal für Gasbeleuchtung und Wasserversorgung, 1896. Die Resultate der doppelten Filtration zu Schiedam. A description of double filtration at Schiedam, with the bacterial results for the two years, 1894 and 1895, showing an average bacterial efficiency of 99.76 per cent. HAZEN. Report to Filtration Commission, Pittsburgh. City document, 1899. A description of experiments upon the treatment of the Allegheny River water by sand and mechanical filters. —— Ohio State Board of Health Report, 1897, p. 154. Report on the Mechanical Filtration of the Public Water Supply of Lorain. Gives the results of a five-weeks test of the Jewell mechanical filters at Lorain, treating Lake Erie water.