None
V., see Blockey Melting point of fats, 147 Methyl-orange, 8 red, 8 Microbes, examination of, 212 Microscope, 199 Microscopic examination of su- mach adulterants, 202 — objectives, 200 — objects, mounting, 200 — sections, cutting of, 201 Mineral acids in oils and fats, 144 — ash in degras, 160 Mimosa, 65 — bark, tests for pure, 61 Moellon, 159 INDEX 221 Mohr's balance, 4 " Mohr's litre," 3 Moisture in hide powder, 85 — in leather, 184 Moulds, 206 Myrobalan sampling, 73 Myrobalans, 65 — in chestnut extract, 63 — in sulphited quebracho ex- tract, 60 — in unsulphited quebracho ex- tract, 56 — mangrove, pulp liquor in mixture, 62 NITRIC acid, n Nitrogen determination by Kjeldahl, 38 Non-tannins, 81 Normal hydrochloric acid, 9 — potassium hydrate, 10 — sodium hydrate, 10 Note-books, I OAKBARK, 65 Oak-wood, 65 — extract in chestnut extract, 62 tests for pure, 63 Objectives, microscopic, 200 Oils and fats, ash in, 144 mineral acids in, 144 • — specific gravity of, 145 — water in, 144 Oleometers, 4 Organic matter in water, 24 Oxalic acid, 12 Oxidised fatty acids, " Degras former," 163 PAESSLER'S chromed hide-pow- der, 1 06 Payne, 28 Permanent hardness, 18 Permanganate method of iron determination, 119 Permutit, 26 Phenolphthalein, 8 Pinebark, 65 Pistacia lentiscus, 64, 65 Pollak, 60 Polysulphides, 35 Potassium hydrate, normal, IO Priestman, 79, 203 Procter, 78, 112 — and Bennett, 79 — and Hirst, 109 — and Hunt, 107 — and McCandlish, 37 — and Searle, 161, 166, 189 Procter's extractor, 94 — method of determining free acids in liquors, no — tanning extraction apparatus, 82 Puers, 46 Pulp extract in chestnut extract, 63 — liquor in sulphited quebracho extract, 61 myrobalans, mangrove in mixture, 62 Pycnometer, 3 QUALITATIVE recognition of a vegetable tannin, 64 Quebracho, 65 — extract, mangrove in sul- phited, 59 — unsulphited, 56 myrobalans in sulphited, 60 unsulphited, 56 pulp liquor in sulphited, 61 pulp liquor in unsulphited, 222 LEATHER CHEMISTS' POCKET-BOOK Quebracho extract, tests for sul- phited, 57 for unsulphited, 55 Quinine hydrochloride, 59 REED, H. C., 116 Refractive constant, 147 — index, 147 Romijn, 131 SAMPLING of tanning materials, A.L.C.A., 74 I.A.L.T.C., 70 Sand and Law, 44 Saponification of waxes, 154 — value, determination of, 149 SchelPs test, 59 Schmidt and Haensch colori- meter, 113 Searle, see Procter Section cutting, microscopic, 201 Seymour- Jones, 115 Simand and Weiss, 78 Soap, alkali in, 135 — analysis of, 134 — fatty matter in, 135 — sampling of, 134 — water in, 135 Sod-oil, 159 Sodium carbonate in water, 21 — hydrate normal, 10 — sulphide, 32 — thiosulphate solution, 157 Softening water with lime, 25 — and soda, 27 Soxhlet tube, 141 Specific gravity, 3 of oils and fats, 145 Spent materials, sampling of, 75 — tans, analysis of used liquors and, 87 Spores, 208 Sprengel tube, 145 Standard solutions, 7 Sterilisation, 209 Sulphates in water, 24 Sulphide, sodium, 32 Sulphides in lime liquors, 41 Sulphuric acid, 1 1 Sulphurous acid, 13 Sumach, 64, 65 — and its adulterants, effects of heating, table, 204 j — sampling, 72 I Suspended matters in water, 24 I TABLE, constants of fats, 168 j of fatty acids, 169 of oils, 167 Tan liquors, acidity of, no — analysis of, 109 Tannin analysis, American Lea- ther chemists' official me- thod, 95 Lowenthal method of, 101 — qualitative recognition of a vegetable, 64 — residues, evaporation of, 88 Tanning absorption, filter paper correction for, 83 — analysis, general regulations, 79 hide powder for, 84 solution for analysis, strength of, 80 — extraction apparatus, Koch's, 82, 94 — Procter's, 82, 94 — liquors, sampling of, 75 — materials, filtration of, 83, 94 neutral sugars present in, 178 I grinding of, 75 | sampling of crude, 74 l total solids in, 81 INDEX 223 Tanning materials, total soluble matter in, 80 used for analysis, quan- tity of, 93 — tests, 114 Tannins, acetic acid lead acetate test for, 50 — alcohol figure for, 54 — ammonium sulphide test for, 52 — aniline test for, 56 — bromine test for, 50 — ethyl acetate figure for, 52 — formaldehyde test for, 51 — gelatin test for, 48 — iron test for, 49 — lead acetate test for. 