RUBBER PLANTING 



245 



Tools, for tapping, 144 



used in Ceylon, 126 



used in Malaya, 126 

 Torquemada, Juan de, 3 

 Transport in Brazil, 23 



in the East, 97 



of latex, 156 



Trimen, Dr, experiments in tapping 

 Hevea, 8 



pricking by, 131 



Ule rubber, 26 



Ulequahuitl (Castilloa elasticd), 3 



Vacuum driers, 163, 165 



in manufacture of rubber, 223 



"Vapourite," 181 



Vegetative organs, 38 



Vulcanisation, 2, 216 et seq. 

 cold, 218, 233 

 Goodyear's dry process, 231 

 hot, 217 



in Amazon districts, 230 

 Hancock's wet process, 231 

 Parkes' cold process, 231, 233 

 time required for, 232 

 Weber on, 217 



Vulcanite, 236 



Wages, in Ceylon, 125 



in Malaya, 125 

 Washing machines, 160 

 Water supply, effect on latex, 88 

 Weber, on rubber solvents, 213 



on vulcanisation, 2, 217 

 Weeding, 1 1 1 



West Africa, rubber planting in, 1 1 

 West Indies, 5, 7, 8 

 Wickham, H. A., 5 



brings Hevea seeds to Kew, 6 



smoking machine of, 166 



Wild rubber, African, 30 et seq. 



from Africa and Asia, 4 



from Congo State, 5 



replanting in Brazil, 209 



smoking of, 20 



tapping of, 20 



trade in, 4 

 Willis, Dr J. C-, 56 



* experiments by, 60 

 Willughbeia, 35, 36 

 Wind, affects Hevea, 179 



belts, 119 

 Wound response, 59 



experiments in Ceylon, 60 



in Castilloa, 59 



in Funtumia, 59 



in Hevea, 59 



in Manihot, 59 



increased yield attributable to, 



61 

 Wright, Herbert, estimate by, 12 



on pricking, 130 



Yield, at different levels, 80, 81, 



148 



duration of, 64 

 effect of rainfall on, 73 

 from Henaratgoda tree, 66, 67 

 from tapping at frequent in- 

 tervals, 78 

 general considerations affecting, 



87 



in relation to bark, 66 

 in relation to volume of bark, 



66 



in grammes, 77 

 per acre, of dry rubber, 64 

 per tapping, variation in, 72 

 plantation, 151 

 season of highest, 72 

 variation in, 74 



CAMBRIDGE : PRINTED BY JOHN CLAY, M.A. AT THE UNIVERSITY PRESS 



