Wool, chrome mordanting of, 77 " dead: why it will not felt, 18 " dyeing, with coal-tar colours, 105 " felted, effect of boiling water on finish and strength of, 22 " felted, effect of stiffening process on finish of, 66, 103 " felting of, interlocking of scales in, 13 " fibre, 8 " " action of acids on, 23 " " " of alkalis on, 24 " " composition of, 22 " " curly structure of, 15 " " distinction between, and hair, 12, 14 " " growth of, 8 " " hygroscopicity of, 20 " " structure of, from diseased sheep, 19 " " sulphur in, reagents for detection of, 26 " grease, 100 " kempy, 19 " merino, 15 " mordanting, 75 " scouring, 101 " stripping of, 23 Woollen goods, indigo-dyed, recovery of indigo from, 24 " " mixed cotton and, separation of, 5 Xylenes, 90 Yellow colour, absorption spectrum of pure, 114 Yolk. _See_ Wool grease. Abridged Catalogue OF _Special Technical Books_. INDEX TO SUBJECTS. PAGE Agricultural Chemistry, 9 Air, Industrial Use of, 10 Alum and its Sulphates, 8 Ammonia, 8 Aniline Colours, 3 Animal Fats, 6 Anti-corrosive Paints, 4 Architecture, Terms in, 22 Architectural Pottery, 12 Artificial Perfumes, 7 Balsams, 9 Bleaching, 17 Bleaching Agents, 17 Bone Products, 8 Bookbinding, 23 Brick-making, 11, 12 Burnishing Brass, 20 Carpet Yarn Printing, 16 Casein, 4 Celluloid, 23 Cement, 22 Ceramic Books, 11 Charcoal, 8 Chemical Essays, 8 Chemical Works, 8 Chemistry of Pottery, 12 Clay Analysis, 12 Coal dust Firing, 19 Colour Matching, 16 Colliery Recovery Work, 18 Colour-mixing for Dyers, 16 Colour Theory, 16 Combing Machines, 18 Compounding Oils, 6 Condensing Apparatus, 19 Cosmetics, 7 Cotton Dyeing, 17 Cotton Spinning, 17, 18 Cotton Waste, 18 Damask Weaving, 15 Dampness in Buildings, 22 Decorators' Books, 4 Decorative Textiles, 15 Dental Metallurgy, 19 Drugs, 22 Drying Oils, 5 Drying with Air, 10 Dyeing Marble, 23 Dyeing Woollen Fabrics, 17 Dyers' Materials, 16 Dye-stuffs, 17