Gelatine-----------------Precipitate. Ferric chloride----------Brown-black coloration. Lead acetate-------------White precipitate, insoluble in HNO_3. Aniline hydrochloride----Slight precipitate. Tanning experiments with this partly neutralised product resulted in a very gradual conversion of the pelt into a greenish-grey coloured leather; the colour, however, does not penetrate the pelt and is hence caused by colloidally suspended impurities. If the solution is filtered through a filter candle, a somewhat clearer solution results, but the latter also tans very slowly and yields a brown coloured leather. Analysis of the partly neutralised product reveals a tannin content of 17.6 per cent. A 2° Bé. solution of the non-neutralised product showed a rapid tanning effect at first, when brought into contact with pelt, on which it had a strong swelling effect, and to which it imparted a greenish colour; the tanning effect, however, slowed down considerably, after a few days, and the solution penetrated the pelt only very gradually; this is probably due to the presence of large quantities of colloidally suspended impurities, which, when the substance is partly neutralised with the formation of salts of the sulphonic acids, are brought into true solution and hence penetrate the pelt with greater rapidity. INDEX OF AUTHORS Adler Appelius Ashmore Bader Badische Anilin u.(German abbreviation for "und") Soda-Fabrik Baekeland Baeyer Berzelius Biginelli Boehringer & Sons Bottinger Braconnot Buff Caro Chem. Fabrik Jucker & Co. Chevreul Dekker Deutsch-Koloniale Gerb u. Farbstoff Gesellschaft Deyeux Dizé Drabble Edner Elberfelder Farbenfabriken Fahrion Feist Fischer, E. Freudenberg Froda Gerhardt Gesellschaft f.(German abbreviation for "für") Chem. Industrie, Basle Graebe Graham Grasser Hatchett Heinemann Herzig Herzog Hönig Iljin Immerheiser Jennings Kahl Kauschke Klepl König Kostanecki Krafft Krauss Kunzemüller Lauffmann Liebig Lipp Lloyd Löwe Manning Mauthner Meunier Michael Mielke Mitscherlich Nierenstein Paessler Paternò Payne Pelouze Perkin Proust Rapoport Raschig Reinsch Resch Russanow Sabanajew Sander Scheele Schiff Schmidt Schorlemmer Seel Seyewetz Sisley Skey Stiasny Strauss Thuau Tschirch Vogel Walden Webster Weinschenk Wohl Zacharias A Alcohol figure Algarobilla Alizarin Alizarin yellow, in paste Alkalies, reaction of, to Neradol D Alum-neradol tannage Alum tannage Aminobenzene Aminophenol, _p_- Aniline dyes Anthracene Anthraquinone Arylsulphaminoarylsulphonic acids Arylsulphoxyarylsulpho acids B Bakelite Bakelite solution Benzoylamino 6-chloranthraquinone Benzylsulphanilate sodium Bismuth salts Bleaching method for leather with Neradol D Bloom Bromo-[Greek: b]-naphthol Bromonitrophenol Bromophloroglucinol Bromosalicylic acid Bromotrinitrophenol C