244 



RUBBER AND 



Rubber, continued 

 resiliency of, 171 

 rings, 230 

 sales, 169 

 scrap, 1 68 

 seeds, oil from, 121 

 seeds, winning of, 6 

 sheet, 225 

 shoes, 230 

 smoking of, 165 

 soils, analyses of, 94 

 solution, 230 

 solvents, Weber on, 213 

 synthetic, 214 et seq. 

 vines planted in Congo, 209 

 washing of, 159 



Sales, rubber, 169 

 Schidrowitz, 36 



on intercrops, 114 



on reclaimed rubber, 235 

 Science, applied to pests and 



diseases, 177 

 Scott, Dr D. H., 47 

 "Scrap, Ceara," 25 



rubber, 168 



Seasonal variation in latex, 71 

 Seed bearers, 102 



selection, 101 



selection by progeny, 103 

 Seedling, laticiferous system in, 46, 47 

 Seedlings, in baskets, 100, no 

 Seringa, 4 



Seringal or estate, 22 

 Seringueiro or collector, 4, 20 

 Shade belts, 119 

 Sheet rubber, preparation of, 225 

 Siam, 35 

 Singapore, 7, 8 

 Smoked sheet, 164 

 Smoking, 165 



of wild rubber, 20 

 South India, labour in, 122 

 Spaniards, early employment of 



rubber by, 3 



Species of rubber, American, 17 et 

 seq. 



African, 30 et seq. 



Asiatic, 34 et seq. 



Sphaerostilbe repens, 184, 187 



Spiral system of tapping, 49 



Spur-shaped pricker, 132 



Stagbrook Rubber Co., crop of, 73 



Stem, diseases of, 187 



Stone cells, 44, 49 



Stumping, 99 



Sudan, 33 



Sulphur, in rubber manufacture, 224 



Sumatra, 35, 36 



Synthetic rubber, 214 et seq. 



discovery by Bouchardet, 215 

 Syringe tree, 4 

 Syringes, 4 



Tackiness, 175 

 Tapping, age for, 128 



average yields (grammes), 77 



basal system, 139 



difficulties, 149 



effects of, 90 



excision methods of, 136 



experiments, 56 



Fitting on, 48 



herring-bone system, 133, 139 



ideal rate of, 80 



incision methods of, 130 



increase of yield on, 61 



intervals, 62, 75, 149 



methods of, 57 



moderate, 90 



paring process, 143 



precautions, 149 



rules for, 92 



severe, 90 



spiral system of, 49 



systems of paring, 137 



time occupied in, 76 



tools, 144 



Tappings, results on intervals of, 62 

 Tea, as intercrop, 114 

 Teats, 230 

 Tephrosia, 113 

 Termes gestroi, 180 

 Thinning out, 121 

 Tilden obtains synthetic rubber, 214 

 Tisdall, W. N., estimate by, 127 



on stumping, 109 

 Tobacco pouches, 228 



