64 TlMEHRI. 
facts afford an idea of the importance of the trade, 
and the abundance in which the trees must exist, con- 
sidering the small quantity yielding at a time by each 
individual. Attention has recently been directed to 
what appears to be another Hevea found in great plenty 
in the virgin forests of the province of Pernambuco and 
alleged to yield rubber of excellent quality, peculiarly 
suitable for certain heavy work, the demand for which 
is said to be so great that this article may soon rival 
Para rubber in the extent of its export. H. brasilianis 
is widely spread through central Brazil over the alluvial 
lands of the Amazon and other rivers and lands which 
are annually flooded. On the lower part of the Amazon 
it appears to be not clear of tidal influence. This tree 
has a close resemblance to H. Spruceana of the Esse- 
quibo River, and grows to about the same size. Castilloa 
elastica, the Central American rubber tree, has a wider 
geographical range and is not chiefly confined to the 
same low altitude. It is a much larger tree, being over 
one hundred and fifty feet high, with stems of four or 
live feet in diameter. The bark is thick and the wood 
exceedingly soft. Its growth is very rapid, and it is 
said to become large enough to tap in six or seven years. 
The juice runs abundantly, but it is inferior in quality to 
that of the Para tree. 
Manihot Glazeovii — Ceara-rubber — is another Brazil- 
Han tree, a close ally of the cultivated cassava. The 
trade name of this rubber is derived from the province of 
Ceara in which it occurs. It is found plentifully in sandy, 
gravelly, or rocky situations, in half-open places or on 
wood-land which is much shaded. The province is 
