99 
rubber fetches a considerably lower price than Kickxia-rubber. 
Generally the labourer collects each day only 500 grm. of wet 
rubber, corresponding to 250 grm. of the dry product. Thus to 
obtain 125 kg. of dry rubber per hectare, 600 working days are 
necessary, and consequently, allowing for the rainy season, holidays, 
&c., about three labourers to the hectare are required. With the 
rapid increase in the cultivation of rubber, it must, however, be 
assumed that the available number of labourers will soon be 
insufficient. Even the 8000 hectares, which have now been planted, 
or 1 kg. of dry rubber per labourer per day may be obtained. 
Should this prove correct, the cost-price would be materially less, 
and also the number of labourers required would be reduced to 
one-fourth. 
* The rubber not only includes all sorts of impurities, on account 
of its mode of preparation, but it also contains much more resin 
than the better kinds among other rubbers. It therefore only 
fetches a little more than half the price of Para-rubber, and is 
even 25-30 per cent. cheaper than good African liane-rubber. It was 
consequently difficult to find a market for it at times when rubber 
was abundant; but, with the high prices of the present day, it is 
now much in request. The export of plantation-rubber from East 
Africa is naturally only of very recent date. Lewa, the oldest 
plantation, exported 34 tons (Tonnen) in 1905, 74 in 1906, and 
124 in 1907. 
“ In the year 1908, however, 87 tons of plantation-rubber, of the 
value of 416,000 marks were exported from East Africa, as against 
124 tons of wild rubber having a value of 576,000 marks. When 
once the 8000 hectares are ready for the collection of rubber, 1000 
tons may be expected from them, and the value of this would be 7-8 
million marks. Thus even in the next few years plantation-rubber 
will have far outstripped wild rubber in East Africa, and will 
probably be the most important article of export of the country. 
Other species of the same genus, Manihot dichotoma, M. heptaphylla 
and M. piauhyensis, recently introduced from Brazil, have not yet 
passed their experimental stage. 
“ Kickzia has been planted in rather large numbers only in the 
Neulangenburg district, where there are about half a million trees, 
as well as 30,000 trees of Castilloa while in the principal region of 
rubber-plantations, in the Tanga district, only 10,000 Castilloa and 
670 Kickria were counted in the year 1908. Neither of these plants 
has any great future in German East Africa, There is a better 
future for Hevea, which thrives quite well in certain places on the 
damp alluvial soil of the rivers. Nevertheless, in consequence of 
two long periods of drought, the climatic conditions are not exactly 
favourable to its development. According to these results, obtained 
18721 FO ht 
