_Re_Coefficient of Transmission of Heat, k/, and the Mean Temperature Difference, [Greek: theta]/m -- Parallel and Opposite Currents -- Apparatus for Heating with Direct Fire -- The Injection of Saturated Steam -- Superheated Steam -- Evaporation by Means of Hot Liquids -- The Transference of Heat in General, and Transference by means of Saturated Steam in Particular -- The Transference of Heat from Saturated Steam in Pipes (Coils) and Double Bottoms -- Evaporation in a Vacuum -- The Multiple-effect Evaporator -- Multiple-effect Evaporators from which Extra Steam is Taken -- The Weight of Water which must be Evaporated from 100 Kilos, of Liquor in order its Original Percentage of Dry Materials from 1-25 per cent. up to 20-70 per cent. -- The Relative Proportion of the Heating Surfaces in the Elements of the Multiple Evaporator and their Actual Dimensions -- The Pressure Exerted by Currents of Steam and Gas upon Floating Drops of Water -- The Motion of Floating Drops of Water upon which Press Currents of Steam -- The Splashing of Evaporating Liquids -- The Diameter of Pipes for Steam, Alcohol, Vapour and Air -- The Diameter of Water Pipes -- The Loss of Heat, from Apparatus and Pipes to the Surrounding Air, and Means for Preventing the Loss -- Condensers -- Heating Liquids by Means of Steam -- The Cooling of Liquids -- The Volumes to be Exhausted from Condensers by the Air-pumps -- A Few Remarks on Air-pumps and the Vacua they Produce -- The Volumetric Efficiency of Air-pumps -- The Volumes of Air which must be Exhausted from a Vessel in order to Reduce its Original Pressure to a Certain Lower Pressure -- Index. #SANITARY PLUMBING, METAL WORK, ETC., ETC.# #EXTERNAL PLUMBING WORK.# A Treatise on Lead Work for Roofs. By John W. HART, R.P.C. 180 Illustrations. 272 pp. Demy 8vo. Second Edition Revised. Price 7s. 6d. net. (Post free, 7s. 10d. home; 8s. abroad.) #Contents.# Cast Sheet Lead -- Milled Sheet Lead -- Roof Cesspools -- Socket Pipes -- Drips -- Gutters -- Gutters (continued) -- Breaks -- Circular Breaks -- Flats -- Flats (continued) -- Rolls on Flats -- Roll Ends -- Roll Intersections -- Seam Rolls -- Seam Rolls (continued) -- Tack Fixings -- Step Flashings -- Step Flashings (continued) -- Secret Gutters -- Soakers -- Hip and Valley Soakers -- Dormer Windows -- Dormer Windows (continued) -- Dormer Tops -- Internal Dormers -- Skylights -- Hips and Ridging -- Hips and Ridging (continued) -- Fixings for Hips and Ridging -- Ornamental Ridging -- Ornamental Curb Rolls -- Curb Rolls -- Cornices -- Towers and Finials -- Towers and Finials (continued) -- Towers and Finials (continued) -- Domes -- Domes (continued) -- Ornamental Lead Work -- Rain Water Heads -- Rain Water Heads (continued) -- Rain Water Heads (continued).