X CONTENTS 



CHAPTER V 



The Tapping of Rubber Plants 



General principles— Fitting's researches— Tapping systems— Re- 

 opening the incisions ....••• PP> 58-68 



chapter vi 

 The Preparation of Rubber 



Coagulation of the latex — Methods of coagulation — Mechanical 

 methods of preparing rubber — Extraction of rubber by solvents — 

 Forms in which rubber is prepared — Drying of rubber — Smoking of 

 rubber — Tackiness of rubber ..... pp. 69-79 



chapter vii 

 The Chemistry of Rubber 



Composition of crude rubber — Properties of rubber — Action of 

 heat on rubber — Chemical reactions of caoutchouc — Vulcanisation — 

 Constitution of caoutcliouc — Synthetic rubb3r — Analysis of crude 

 rubber — Viscosity of rubber solutions — Mechanical testing of rubber 



pp. 80-91 



CHAPTER VIII 



Statistics of Consumption and Prices 



Countries of consumption — Rubber markets — Market values — Fine 

 hard Para — Plantation Para — African rubbers . pp. 92-100 



CHAPTER IX 



The Para Rubber Tree {Hevea brasiliensis, Miill. Arg.) 



Species of Hevea — Hevea hrasilienais — Botanical characters — 

 Distribution — Climatic conditions in Brazil — Collection and prepara- 

 tion of Para rubber in Brazil— Cultivation — Climatic conditions — 

 SoiU — P'ormation of plantations — Raising of plants — Rate of growth 

 —Weeding and catch-crops— Mnniiriiij:- Diseases and Pests — Tapping 

 — Collection of the latex — Preparation of the rubber- Yield of rubber 

 — Composition of Para rubber ..... pp. 101-130 



