British and Metric Systems Compared -- Centigrade and Fahr. Thermometers -- Estimation of the Maximum Weight of Saturated Aqueous Vapour which can be contained in 1 kilo. of Air at Different Pressure and Temperatures -- Calculation of the Necessary Weight and Volume of Air, and of the Least Expenditure of Heat, per Drying Apparatus with Heated Air, at the Atmospheric Pressure: _A_, With the Assumption that the Air is _Completely Saturated_ with Vapour both before Entry and after Exit from the Apparatus -- _B_, When the Atmospheric Air is Completely Saturated _before entry_, but at its _exit_ is _only_ 3/4, 1/2 or 1/4 Saturated -- _C_, When the Atmospheric Air is _not_ Saturated with Moisture before Entering the Drying Apparatus -- Drying Apparatus, in which, in the Drying Chamber, a Pressure is Artificially Created, Higher or Lower than that of the Atmosphere -- Drying by Means of Superheated Steam, without Air --Heating Surface, Velocity of the Air Current, Dimensions of the Drying Room, Surface of the Drying Material, Losses of Heat -- Index. (_See also "Evaporating, Condensing and Cooling Apparatus," p. 26._) #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.#