134 THE WHOLE ART OF RUBBER-GROWING 



sold in the form of powdered resin. The cost of the 

 raw material, which must be brought to the factory 

 by the Dyaks, amounts to nearly is. per pound of 

 rubber manufactured. 



Tirucalli or E. Grandidens and E. Candelabria. — 

 This is virtually the African jelutong, and flourishes 

 over a large area of the Tugela Valley, Natal. The 

 natives know no other name for it but the aloe, and 

 under this patronymic it has been known and 

 neglected for years. Latterly the attention of ex- 

 perts has been called to the plant, with the result that 

 experiments under the auspices of the Natal Govern- 

 ment were undertaken with a view to determining 

 the commercial value of the latex. Analysis shows 

 that, like the Dyera of the Middle East, it contains 

 barely n per cent, of rubber, and a very high per- 

 centage of resin, which may, however, repay recover- 

 ing. 



The Landolphias. — The most important of the 

 vine order of rubbers is the L. Kirki and 

 L. owariensis, which are distributed throughout the 

 whole tropical region. With the introduction of 

 modern machinery the exploitation of the Landol- 

 phias has entered upon an interesting stage in the 

 production of wild and inferior rubbers, since it is 

 claimed for these machines that they can turn out a 

 product equal to the highest-priced fine Para. But 

 there is no likelihood of such a claim ever being sus- 

 tained with respect to the vine order, inasmuch as 

 the latices are notoriously deficient in the qualities 

 possessed by the Heveas, the Manihots, the Fun- 



