KEMNA. The Biology of Sand Filtration. Read before the annual convention of the British Association of Water Works Engineers. Abstract in Engineering News, XLI., p. 419. Describing organisms which develop in open sand filters, both animal and vegetable, and their effects upon the process. A quite full account of the author’s extended experience, and the only paper treating this subject. MAGAR. Journal für Gasbeleuchtung und Wasserversorgung, 1897, p. 4. Reinigungsbetrieb der offener Sandfilter des Hamburger Filterwerkes in Frostzeiten. A new method of cleaning open filters in winter without the removal of the ice. PANWITZ. Arbeiten aus dem Kaiserlichen Gesundheitsamte, XIV., p. 153. Die Filtration von Oberflächenwasser in den deutschen Wasserwerken während der Jahre 1894 bis 1896. A description of the filtration works in Germany, and the results obtained from them, particularly from the point of view of bacterial efficiency. Results are graphically shown by a series of charts. REYNARD. Le Génie Civil, 1896, XXVIII., p. 321. Purification of water with the aid of metallic iron. Describing the works of the Compagnie Général des Eaux for supplying the suburbs of Paris with filtered water, the capacity of the works being over 23,000,000 gallons daily. WESTON. Rhode Island State Board of Health, 1894. Report of the Results Obtained with Experimental Filters at the Pattaconset Pumping Station of the Providence Water Works. Relates particularly to the bacterial purification obtained with rapid filtration aided by sulphate of alumina. These were the first systematic experiments made with mechanical filters. WHEELER. Journal of the New England Water Works Assoc., XI., p. 301. Covered Sand Filter at Ashland, Wis. A description of the covered filters built by the author at Ashland Wis. for the purification of the bay water. Views and drawings. APPENDIX XI. THE ALBANY WATER-FILTRATION PLANT. (Abridged from Proceedings American Society of Civil Engineers, Nov. 1899.) Albany, N. Y., was originally supplied with water by gravity from certain reservoirs on small streams west and north of the city. In time, with increasing consumption, the supply obtained from these sources became inadequate, and an additional supply from the Hudson River was introduced. The water was obtained from the river through a tunnel under the Erie Basin, and a pumping-station was erected in Quackenbush Street to pump it to reservoirs, one of which served also as the distributing point for one of the gravity supplies. The intake, which was used first in 1873, drew water from the river opposite the heart of the city. In recent years, the amount of water drawn from this source has greatly exceeded that obtained from the gravity sources.