PREFACE. 
The object of the volumes of * Selected Papers from the Kew 
Bulletin," to which the present one belongs, has been explained 
in the preface to the first selection of the kind, which deals with 
* Vegetable Fibres " and was issued eight years ago. 
The practical value of previous selections has been so great that 
the issue of the present volume, which deals with * Rubber," 
requires no explanation. 
The arrangement of the papers here reprinted from the pages 
of the Kew Bulletin is that adopted in the selection which deals 
with “Fibres”; the notes and papers regarding individual 
rubber-yielding plants are given in the sequence adopted in 
the Genera Plantarum of Bentham and Hooker, of the natural 
families to which the various species belong. Those few papers, 
of a general character, which cannot in their entirety be allocated 
to particular natural families, and at the same time cannot con- 
veniently be divided into sections, precede the more special 
articles, 
D.E 
Royal Gardens, Kew, 
August, 1906. 
1000 Wt 2985 10/06 D&S 29- 25781 
