82 TlMEHRI. 
the india-rubber trees. I have before mentioned that 
there are probably two or three species of Hevea in 
Guiana. H. Guyanensis, according to Professor Oliver's 
note is one ; and two species of Siphonia are mentioned 
by Schomburgk. Some of these are doubtfully distinct ; 
but however this may be, there are species of Ficus and 
Urostigma the commercial value of which it is important 
to ascertain. Para-rubber was last quoted at 3s. 2d. a 
lb. — a slight reduction on previous prices. 
