Standard latex, 96 -- sheet, 102 Standardising instruments, 98 Stickiness in sheet, 274 Stock solution, method of making, 75 Storage of rubber, 212, 216 Stoves, iron, for smoke houses, 189 Straining latex, 67 Streaks, 262 Stumps, 9 Sugars, coagulation with, 287 Sulphuric acid, 280, 286 -- --, buying, 280 -- --, formula for use of, 280 -- --, storing, 280 Sun-drying sheet rubber, 147 Support marks on sheet, 273 Surface blotches, coloured, 249 --, dull or black, 258 -- pattern of sheet, 274 Tackiness, cause of, 243 --, copper salts cause of, 243 -- in rubber, 242 Tanks, 90 --, care of, 94 --, designs and "layout," 176 --, drains for, 176 --, installation of, 93 --, situation of, 175 --, water-supply for, 177 Tapping, 38 --, former systems of, 29 -- knives, 38 -- systems, 38 Tartaric acid, 279 Tensile product, 314 Test mix, formula for, 311 -- pieces, making of, 310 Testing of plantation rubber, 307 Thick ends of sheet, 275 Thinning, 19 Timber for smoking, 147 Tool sheds, 216 Transport, 60 -- by coolie, 62 -- of coagulum, 59, 63 -- of latex, 59 Trays, 167 Treatment of rubber in the factory, 301 -- to prevent rust, 265 Tree scrap, 55, 122 -- --, care of, 56 -- --, oxidation of, 56 Trees per acre, 26 Trenches, silt catchment, 11 Uniformity, 90 -- in colour, lack of, 246 Vacuum driers, 134 Variation due to oxidation, 254 Vegetable extracts, 289 Ventilation of drying houses, 185 -- factories, 180 Verandas, 175 Virgin spots, 258 Viscosity of rubber solution, 309 Vulcanisation, 301 --, rate of, 318 Vulcanised rubber, 318 -- --, tests on, 309 Vulcanising, 307 -- catalysts, 312 --, "heat," 306 Washers, scrap, 57, 124 Washings, 122 Water-supply for tanks, 177 Weeding, clean, 13 Weights, "short," 157 Wickham process, 293 Windows of drying houses, 185 -- factories, 181 Working of rubber, 304 Yields, 23, 25