4i6 SCIENCE PROGRESS 



requires the erection of scaffolding, which adds greatly to the 

 expense. 



Interesting experiments as to yield have been carried out 

 by the Ceylon Botanic Gardens Department 1 on the original 

 Henaratgoda trees. These bring out clearly the great rubber- 

 producing capacity of the basal six feet of trunk and the small 

 yield afforded by the higher parts. 



The improbability of obtaining rubber from the young stems, 

 leaves, and unripe fruits will be referred to in the concluding 

 portion of this paper, which will deal chiefly with the preparation 

 of the rubber from the latex. 



1 Roy. Bot. Gardens, Ceylon, Administration Report, 1906, p. 32. 



