Rubber, Gutta-percha and Balata

acid Africa Amazon Amazon River Angola Apocynaceae Assam balata balls bark becomes bisulphide of carbon boiler Borneo botanical BOTANIST Brazil Burcke Cameroon caout caoutchouc tree Castilloa Ceara cent chemical chouc coagulation coast collected colour Congo contains cultivation cwts cylinders Dichopsis dolphia dried elastic elastica export feet Ficus Ficus elastica flowers fluid genus gutta gutta-percha Hamburg Hancornia hard rubber heat Hevea importance inches inferior influence Isonandra Isonandra Gutta Java Kickxia kinds Landolphias latex leaves Lerii Madagascar Malacca Malayan Manihot manufacturers material method mixed moulds natives oblongifolium origin Pahang Palaquium Palaquium Gutta Payena percha piculs pieces placed plantations pressed production quantities raw caoutchouc resin rolled rollers seeds Seligmann-Lui seringueiros sheets Singapore smell soft soon species sticky substances sulphur Sumatra supply tapping temperature thick threads tion trade tubes Urceola Urceola elastica vulcanised rubber washing