PURE AIR, OZONE AND WATER. A Practical Treatise of their Utilisation and Value in Oil, Grease, Soap, Paint, Glue and other Industries, By W. B. Cowell. Twelve Illustrations. Crown 8vo. 85 pp. Price 5s. net. (Post free, 5s. 3d. home; 5s. 6d. abroad.)

Contents.

Atmospheric Air; Lifting of Liquids; Suction Process; Preparing Blown Oils; Preparing Siccative Drying Oils -- Compressed Air; Whitewash -- Liquid Air; Retrocession -- Purification of Water; Water Hardness -- Fleshings and Bones -- Ozonised Air in the Bleaching and Deodorising of Fats, Glues, etc.; Bleaching Textile Fibres -- Appendix: Air and Gases; Pressure of Air at Various Temperatures; Fuel; Table of Combustibles; Saving of Fuel by Heating Feed Water; Table of Solubilities of Scale Making Minerals; British Thermal Units Tables; Volume of the Flow of Steam into the Atmosphere; Temperature of Steam -- Index.

THE INDUSTRIAL USES OF WATER. COMPOSITION--EFFECTS--TROUBLES--REMEDIES--RESIDUARY WATERS--PURIFICATION--ANALYSIS. By H. de la Coux. Royal 8vo. Translated from the French and Revised by Arthur Morris. 364 pp. 135 Illustrations. Price 10s. 6d. net. (Post free, 11s. home; 11s. 6d. abroad.)

Contents.

Chemical Action of Water in Nature and in Industrial Use -- Composition of Waters -- Solubility of Certain Salts in Water Considered from the Industrial Point of View -- Effects on the Boiling of Water -- Effects of Water in the Industries -- Difficulties with Water -- Feed Water for Boilers -- Water in Dye works, Print Works, and Bleach Works -- Water in the Textile Industries and in Conditioning -- Water in Soap Works -- Water in Laundries and Washhouses -- Water in Tanning -- Water in Preparing Tannin and Dyewood Extracts -- Water in Papermaking -- Water in Photography -- Water in Sugar Refining -- Water in Making Ices and Beverages -- Water in Cider Making -- Water in Brewing -- Water in Distilling -- Preliminary Treatment and Apparatus -- Substances Used for Preliminary Chemical Purification -- Commercial Specialities and their Employment -- Precipitation of Matters in Suspension in Water -- Apparatus for the Preliminary Chemical Purification of Water -- Industrial Filters -- Industrial Sterilisation of Water -- Residuary Waters and their Purification -- Soil Filtration -- Purification by Chemical Processes -- Analyses -- Index.

(See Books on [Smoke Prevention, Engineering and Metallurgy etc].)

X Rays.

PRACTICAL X RAY WORK. By Frank T. Addyman, B.Sc. (Lond.), F.I.C., Member of the Roentgen Society of London; Radiographer to St. George's Hospital; Demonstrator of Physics and Chemistry, and Teacher of Radiography in St. George's Hospital Medical School. Demy 8vo. Twelve Plates from Photographs of X Ray Work. Fifty-two Illustrations. 200 pp. Price 10s. 6d. net. (Post free, 10s. 10d. home; 11s. 3d. abroad.)

Contents.