vi PREFACE. 



result of my own observations in Ceylon and West Africa, I have 

 not hesitated to make frequent extracts from the India-rubber 

 Journal, the Straits Settlements Agricultural Bulletin, and Mr 

 Arden's " Report on Para Rubber in the Malay Peninsula." For 

 these extracts, I have obtained the kind permission of the 

 Editors of the two first-mentioned publications and the Author 



of the latter. 



W. H. JOHNSON. 



ROYAL BOTANIC GARDENS, 



KEW, S.W'., September 1904. 



