Engines, 170 --, position of, 174 Factories, 172 --, centralisation of, 221 --, decentralisation of, 221 --, number of floors, 174, 178 --, ventilation of, 180 --, windows of, 181 Factory buildings, situation of, 216 --, choosing site for, 220 --, ideal arrangement of, 162 -- operation, 65 Fibre cotton, in crepe, 230 Field maintenance, 13 Fine hard Para properties of, 325 First latex and other grades, percentage of, 59 Floor of drying chamber, 187 -- factories, 173 -- furnace room, 196 Formalin, 87 Formic acid, 74, 279 Formula for test mix, 311 Freezing (coagulation) process, 293 Fuel, consumption of, 196 Fuels for smoking, 146 Furnace room, floor of, 196 -- --, Petaling type of, 192 Furnaces, horizontal drum, 189 --, "pot," 188 Germination, 6 Grades, number of, 151 Grading, 150 Grafting, 8 Grass squares, 14 Greasiness before smoking, 252 -- of surface, 258 Grit in crepe, 232 Hand rolling sheets, 104 Hevea Brasiliensis, 1 Hot air drying houses, 182 Hydrochloric acid, 282 Hydrofluoric acid, 282 Ilcken-Down process, 298 Instruments, method of using, 100 --, recording, 144 --, standardising, 98 Lallang, eradication of, 15 Latex, bulking, 69 -- cups, choice of, 40 --, decomposition of, in the field, 270 --, first and other grades, percentage of, 59 --, first quality, 150 --, mixing acid with, 79 --, mixing sodium bisulphite solution with, 117 --, preliminary treatment of, 65 --, reception of, at the store, 65 --, standard, 96 --, standardisation of, 69, 110 --, straining, 67 --, transport of, 59 Light, importance of, in factories, 172 Litharge, 312 Load stretch curve, 312, 319, 320, 321 Low grade rubbers, fibrous matter in, 124 Lower grade rubber, care in manufacture, 129 Lubrication of machines, 166 Lump rubber, naturally coagulated, 120 Machinery, 159 Machines, access to, 169 --, adequacy of, 160 --, arrangement of, 168 --, lubrication of, 166 --, position of, 173 --, sheeting, 166 --, speed of, 162 Mangrove, 147 Marking sheets, 105 Metrolac, 98, 100 Michie-Golledge system, 138 Mildew on surface, 260 Milky residue on serum, 249 Mixing acid with latex, 79 Moist glaze of surface, 258 Mould on surface, 260 Moulds, surface, on crepe, 241 Natural catalysts, 312 Nitric acid, 282 Nurseries, 9 Overcured, 307 Overvulcanised, 306 Oxalic acid, 279 Oxidation, prevention of, 56 --, variation due to, 254 Packing, 150 --, bags for, 154 --, bales for, 154 --, cases, choice of, 153 --, folding for, 155 --, methods of, 156 --, rooms, 211 Pale crepe, No. 1 fine, 110 --, rubber, former methods of making, 118 --, sheet, 89 Patches, 259, 260 --, virgin, 259 Payment by result, 53 Perished rubber, 306 Physical properties of rubber, variation of, 317 Pits for smoke houses, 188