PREFACE vii 



The chemistry of rubber has been dealt with only 

 in the barest outline, but the book seemed incomplete 

 without some reference to this side of the subject. It is 

 hoped that the brief summary of the processes employed 

 in the manufacture of rubber goods will be of some 

 interest both to the planter and to the general public. 

 Of both these branches an excellent account on a much 

 fuller scale is readily accessible in Dr Schidrowitz's book 

 on Rubber. Other sources of information are acknow- 

 ledged in a separate list of references. 



I am indebted to several friends for advice and 

 criticism. Mr W. N. Tisdall very kindly read through 

 the whole of Chapters V, VI and VII, and made a 

 large number of valuable suggestions, practically all 

 of which have been incorporated. Mr Tisdall also 

 provided the estimate given on p. 127. Professor 

 T. B. Wood was also kind enough to read part of 

 the proofs. 



The text illustrations of different rubber-producing 

 species have been drawn for me by Mr L. Denton Sayers 

 mostly from living specimens and I am much in- 

 debted to him for the trouble he has taken with them. 

 I have also to thank Mr H. F. Macmillan and Mr C. 

 Northway for the loan of valuable photographs, Mr 

 Staines Manders for the loan of blocks from the 

 Catalogue of the New York Rubber Exhibition, and 

 Messrs F. Shaw and Co. for illustrations of machinery. 



