244 



INDEX 



mansiana in, 2G ; Landolphia 

 Kirkii 'u\, 20 ; Landolphia par- 

 vifolia in, 20 ; Landolphia Thol- 

 lonii in, 20 ; rubber plants of, 

 20; cultivation of rubber plants 

 in, 27 ; rate of growth of Hevea 

 brasiliensis in, 115; rate of 

 growth of Manihot Glaziovii in, 

 140 ; yield of rubber from 

 Manihot Glaziovii in, 151 



Panaiiifi, yield of rubber from 

 Castilloa elastica in, 222 



Papua, area luider rubber in, 5 ; 

 production of rubber in, 10 



Para rubber, fine hard, market 

 values of, 95-7 ; fine plantation, 

 market values of, 95-7 ; collec- 

 tion and prejjaration in Brazil, 

 1 04 ; yields in different coiui- 

 tries, 125-35 ; plantation, com- 

 position of, 53, 130 



Paj-a rubber seed oil, 103 



Para rubber tree {.sec Hccur. 

 brasiliensis) 



Parameria glanduli/era, 41 ; com- 

 position of rubber from, 41 



Parthcnium argentatum, 43 



"Paste" rubber, 18, 21 



Pcmba, cultivation of rubber 

 plants in, 27 ; Landolphia Kir- 

 kii in, 27 ; Mascarenhasia 

 elastica in, 27 ; rubber plants of, 

 27 



Pests of Hevea brasiliensis, 117, 

 119 ; of Funtumia elastica, 109 



Pcriploca ni-grescetis, 37 



I'cru, production of rubber in, 8 



Phytophthora Faheri, 1 1 8 



Pontianac, 42 



Production of rubber, 5-10 ; 

 world's supply, 



Protein, amount present in rubber, 

 54 



Raphionacnie utilis, 30 ; compo- 

 sition of rubber from, 37 



Resin, amount present in rubber, 

 50-4 ; variation in amount with 

 age of tree, 51-3 ; variation in 

 amount in different parts of 

 plant, 53 



Rhodesia, Carpodinus gracilis m, 

 28 ; Glilandra henriquesiana in, 

 28 ; Landolphia Kirkii in, 28 ; 

 Landolphia parvifolia in, 28 ; 

 rubl>er plants of, 28 



Phynchodia Wullichii, 41 ; com- 

 position. of rubber from, 41 



"Root rubber," plants yielding, 

 180; preparation of, 195; 

 yields of, 204-5 



Rubber, utilisation of, 3 ; vul- 

 canisation of, 3, 83 ; produc- 

 tion of, 5-10 ; world's supply of, 

 ; methods of preparmg, 09- 

 77 ; characters of freshly pre- 

 pared, 73 ; extraction from 

 plants by soU'ents, 73 ; me- 

 chanical methods of preparing, 

 73; forms of commercial, 74-5; 

 drying of, 75 ; smokmg of, 77 ; 

 taclciness of, 7 7-9 ; composition 

 of, SO ; i^roperties of, 80 ; ac- 

 tion of heat on, 81 ; synthetic, 

 84 ; analysis of crude, 80 ; vis- 

 cosity of solutions of, 88 ; me- 

 chanical testing of , 89 ; countries 

 of consumption of, 92 ; markets 

 for, 94 ; market values of, 95- 

 100 



Rubber plants, cultivation of, 3 



Rubber-yielding plants, 29-43 ; 

 botanical soiu-ce, 29 ; geo- 

 graphical distribution, 29 



Sanitation of rubber plantations, 

 119 



Sapium cladogync in British 

 Guiana, 32 



Sapium Jenmani in British Gui- 

 ana, 32 ; composition of rubber 

 of, 32 



Sapium spp., 32 



Sapium Taburu in Brazil, 32 



Sapium utile, 32 



Sarawak, production of rubber ii^, 

 10 



Sierra Leone, production of rub- 

 ber in, 10, 11, 15; Landolphia 

 owariensis in, 15 ; rubber plants 

 of, 15 ; Funtumia elastica in, 

 15, 10 ; Clitandra laxi flora in, 

 10; Clita)idra Mannii in, 10; 

 cultivation of rubber plants in, 

 10; Ficus Vogelii in, 10 



Soils suitable for Hevea brasilien- 

 sis, 108 



Sphaerostilbc rcpcns, 1 1 8 



Straits Settlements (see also 

 JIalaya), area under rubb«r in, 

 5 ; production of rubber in, 10 



Strophanthus Prcussii, juice of, 

 used for coagulatuig Funtumia 

 elastica latex, 100 



Sudan, composition of coagulated 

 lafcox of Ficus platyphylla from, 

 236 



