Stenographic reports of the proceedings of this society are printed regularly in the _Journal für Gas- und Wasserversorgung_, and the discussions of papers are often most interesting. DROWN. Journal Association Eng. Societies, 1890, p. 356. Filtration of natural waters. FISCHER. Vierteljahresschrift für Gesundheitspflege, 1891, p. 82. Discussion of papers on water-filtration. FRÄNKEL. Vierteljahresschrift für Gesundheitspflege, 1891, p. 38. On filters for city water-works. FRÄNKEL and PIEFKE. Zeitschrift für Hygiene, 1891, p. 38, Leistungen der Sandfiltern. E. FRANKLAND. Report in regard to the London filters for 1893 in the Annual Summary of Births, Deaths, and Causes of Death in London and Other Great Towns, 1893. Published by authority of the Registrar-General. P. FRANKLAND. Proc. Royal Society, 1885, p. 379. The removal of micro-organisms from water. —— Proceedings Inst. Civil Engineers, 1886, lxxxv. p. 197. Water-purification; its biological and chemical basis. —— Trans. of Sanitary Institute of Great Britain, 1886. Filtration of water for town supply. FRÜHLING. Handbuch der Ingenieurwissenschaften, vol. ii. Chapter on water-filtration gives general account of filtration, with details of Königsberg filters built by the author and not elsewhere published. FULLER. Report Mass. State Board of Health, 1892, p. 449. Report Mass. State Board of Health, 1893, p. 453. Accounts of the Lawrence experiments upon water-filtration for 1892 and 1893. —— American Public Health Association, 1893, p. 152. On the removal of pathogenic bacteria from water by sand filtration. —— American Public Health Association, 1894, p. 64. Sand filtration of water with special reference to results obtained at Lawrence, Mass. GILL. Deutsche Bauzeitung, 1881, p. 567. On American rapid filters. The author shows that they are not to be thought of for Berlin, as they would be more expensive as well as probably less efficient than the usual procedure. —— Journal für Gas- und Wasserversorgung, 1892, p. 596. A general account of the extension of the Berlin filters at Müggel. No drawings. GRAHN. Journal für Gas- und Wasserversorgung, 1877, p. 543. On the filtration of river-waters. —— Journal für Gas- und Wasserversorgung, 1890, p. 511. Filters for city water-works. —— Vierteljahresschrift für Gesundsheitpflege, 1891, p. 76. Discussion of papers presented on filtration. —— Journal für Gas- und Wasserversorgung, 1894, p. 185. A history of the “Rules for Water-filtration” (Appendix I), with some discussion of them. GRAHN and MEYER. Reiseberichte über künstliche central Sandfiltration. Hamburg, 1876. An account of the observations of the authors in numerous cities, especially in England. GRENZMER. Centralblatt der Bauverwaltung, 1888, p. 148. A description of new filters at Amsterdam, with plans. GRUBER. Centralblatt für Bakteriologie, 1893, p. 488.