See also Davies' Hygiene, p. 99, and MacLeod's Public Health, p. 110.

Gas Manufacture (The Chemistry of). A Handbook on the Production, Purification, and Testing of Illuminating Gas, and the Assay of Bye-Products. By W.J.A. Butterfield, M.A., F.I.C., F.C.S. With Illustrations. Third Edition, Revised (in preparation). [See page 77.

Water Supply: A Practical Treatise on the Selection of Sources and the Distribution of Water. By Reginald E. Middleton, M. Inst. C.E., M. Inst. Mech. E., F.S.I. With Four Plates and Numerous Diagrams. Crown 8vo. [See page 77.

Central Electrical Stations: Their Design, Organisation, and Management. By C.H. Wordingham, A.K.C., M. Inst. C.E. Price 24s. net.

For details see opposite page.

Sewage Disposal Works: A Guide to the Construction of Works for the Prevention of the Pollution by Sewage of Rivers and Estuaries. By W. Santo Crimp, M. Inst. C.E., F.G.S. Second Edition, Revised and Enlarged. Large 8vo, Handsome Cloth. With 37 Plates. Price 30s. [See page 76.

Trades' Waste: Its Treatment and Utilisation, with Special Reference to the Prevention of Rivers' Pollution. By W. Naylor, F.C.S., A.M. Inst. C.E. With Numerous Plates, Diagrams, and Illustrations. 21s. net. [See page 76.

Calcareous Cements: Their Nature, Preparation, and Uses. With some Remarks upon Cement Testing. By Gilbert Redgrave, Assoc. Inst. C.E. With Illustrations, Analytical Data, and Appendices on Costs, &c. 8s. 6d. [See page 76.

Road Making and Maintenance: A Practical Treatise for Engineers, Surveyors, and others. With an Historical Sketch of Ancient and Modern Practice. By Thomas Aitken, Assoc. M. Inst. C.E., M. Assoc. Municipal and County Engrs.; M. San. Inst. With numerous Plates, Diagrams, and Illustrations. 21s. [See page 79.

Light Railways at Home and Abroad. By William Henry Cole, M. Inst. C.E., late Deputy Manager, North-Western Railway, India. Large 8vo, Handsome Cloth, Plates and illustrations. 16s. [See page 30.