Sulphuric acid, 49 Sulphurous acid bleach, 180 Sumach, 128, 133 ---- tanning with, 33 Surface water, 87 Sweat-glands, 22 Tallow, 60 Tanned furs, qualities of, 48 Tanning methods, comparison of, 65 Tannins, 32, 132 Tiger, 19 Top-hair, 24 Train oils, 63 Tramping machine, 61 Turmeric, 136 Under-hair, 24 Under-wool, 24 Ungreenable aniline black, 148 Unhairing, 82 ---- machine, 83 Ursol dyes, 157, 165 Vanadium compounds, 147 Vat dyes, 177 Vegetable dyes, 128, 136 ---- oils, 59 ---- tans, 49, 65 Verdigris, 120 Water, hard, 87 ---- soft, 87 Whale oil, 60 White fox, bleaching of, 179 Wolf, 6, 19 Wolverine, 6, 20 Wombat, 20 Wood dyes, 128 Yellow wood, 134 LITERATURE OF THE CHEMICAL INDUSTRIES On our shelves is the most complete stock of technical, industrial, engineering and scientific books in the United States. The technical literature of every trade is well represented, as is also the literature relating to the various sciences, both the books useful for reference as well as those fitted for students’ use as textbooks. A large number of these we publish and for an ever increasing number we are the sole agents. ALL INQUIRIES MADE OF US ARE CHEERFULLY AND CAREFULLY ANSWERED AND COMPLETE CATALOGS AS WELL AS SPECIAL LISTS SENT FREE ON REQUEST [Illustration] D. VAN NOSTRAND COMPANY _Publishers and Booksellers_ 8 WARREN STREET NEW YORK * * * * * Transcriber’s Notes: Punctuation has been standardised--in particular, missing periods and quotation marks have been supplied where obviously required. Three entries in the bibliography were located out of alphabetical order, and have been moved accordingly (Fougerat, Lamb, Martin). All other original errors and inconsistencies have been retained, except as follows: