10 ON THE COMMERCIAL KINDS OF INDIA-RUBBER. 
is yellow, a little streaked with red on one side, about the size of an 
Orleans plum, and of delicious flavour. When in season, it is brought 
to Pernambuco for sale. Claussen, in his communication to the British 
Association in 1855, states that the plant is found * at a height of from 
3000 to 5000 feet above the sea, on the plateaux of South America, 
between 10° and 12? S. lat." It occurs in abundance about Per- 
nambuco and Olinda. I have not been able to obtain any specimen of 
this rubber.* A sale of a small parcel took place in Liverpool in July 
last, at 2s. per lb., proving it to be little inferior to Para rubber in 
value. 
Castilloa elastica.—'To this plant we are indebted for nearly all our 
india-rubber obtained from Central America, New Granada, Ecuador, 
and the West Indies. It is found in Mexico, all the Central American 
republics (viz. Guatemala, Salvador, Honduras, Nicaragua, and Costa- 
rica), Isthmus of Panama, West Coast of America down to Guayaquil 
and the slopes of the Chimborazo ; it also grows in Cuba ; and, if the 
early account of Columbus may be relied upon, in Hayti. The Spanish 
name of this tree is ** Arbol de Ulé,” or Ulé-tree, an exact translation 
of the Aztec ** Ulequahuitl." On a specimen collected in Guatemala, 
in 1861, the collector says, ** All the caoutchouc of Central America is 
derived. from this tree, and that from Carthagena and Guayaquil pro- 
bably from the same source." On some specimens in the Kew Her- 
barium, collected by Mr. Sutton Hayes, the following notes occur :— 
“ Leaves of the Ulé-tree, collected in San Salvador, May 15th, 1860. I also 
got ripe fruit from the same place at the same time. Sometimes the leaves are 
much larger than these. I have collected the leaves of this same tree on the 
Isthmus of Panama, at a small native town on the Rio Gatun, about six miles 
from i digas a es jus I saw the natives making the caoutchouc ; 
but the t on the Rio Trinidad, where there is an establish- 
ment ert very fine and pure caoutchouc from it. The caoutchouc fur- 
nished by this tree, when well cleaned and prepared, is very nearly equal to 
that of Para, some fine lots of it having been sold in New York for nearly as 
high a price as that from Brazil; but the finest specimens of the caoutchouc I 
ever saw were made from the milk of this same tree at Chinandega, in Nica- 
ragua. Caoutchouc, within the last year, has been shipped quite largely from 
all the Central American ports at which the Panama Railroad Company’s 
steamers touch,” 
* It is described as being of a yellowish colour, and very much like Para. 
