The epidemic of typhoid-fever in Altona in 1891.

—— Journal für Gas- und Wasserversorgung, 1893, p. 161.

Results of experiments upon filtration made at Altona, and bacterial results of the Altona filters in connection with typhoid death-rates.

—— Trans. Am. Society of Civil Engineers, 1893, xxx. p. 330.

Questions of water-filtration.

Leslie. Trans. Inst. Civil Engineers, 1883, lxxiv. p. 110.

A short description of filters at Edinburgh.

Lindley. A report for the commissioners of the Paris Exposition of 1889 upon the purification of river-waters, and published in French or German in a number of journals, among them Journal für Gas- und Wasserversorgung, 1890, p. 501.

This is a most satisfactory discussion of the conditions which modern experience has shown to be essential to successful filtration.

Mason. Engineering News, Dec. 7, 1893.