ROYAL BOTANIC GARDENS, KEW., 
SELECTED PAPERS 
FROM THE 
KEW BULLETIN. 
IIL--RUBBER. 
I—SOURCES OF RUBBER SUPPLY. 
[K.B., 1892, pp. 67-71.] 
Para rubber is the produce of Hevea brasiliensis, Muell. Arg., a 
tree belonging to the natural order Euphorbiaceae. The rubber is 
obtained from incisions cut through the bark, from whence the sap 
trickles into small bowls and is finally cured by being ladled on 
ld over a i i 
N gia) are burnt as n 
Museum No. 1, Case 94 [now Case 105], will bé found a s fido series 
of articles used in collecting and preparing pes rubber for export, 
and also numerous samples of the rubber. In 1891 the estimated 
export of Para rubber eee to 17,700 tons, of which 6,000 tons 
were imported into this country. 
A sample of rubber from H. brasiliensis, grown at Mergui, 
im was reported upon in this country in 1889 as worth 1s. 11d. 
r lb. 
pda rubber or “Ceara Scrap” is afforded by Manihot a 
Muell. Arg., a tree native of South America and belon o the 
natural order Huphorbiaceae. The imports of this fale de this 
= ge ger Me 180 tons in 1891. In Case 96 [now Case 106], 
Museum No. l be found samples from vro and also from 
Siate inircduded pée Ceylon, Zanzibar, and Nat 
Mangabeira or Pernambuco rubber is extracted RIT a small tree 
(Hancornia speciosa, Gomez) of the natural order Apocynaceae. 
A Seong of this rubber are shown in Case 72 [now Case 76], 
Museum No. 1. 
Ts principal source of Central American rubber is Satitoa 
elastica, a sages forest tree of the tribe Artocarpeae of the natural 
order Urticac It affords the Ule of British Morin » well 
as Nie caragua, hoc neu) Mexico, and Guayaquil rubbers. e 
total imports of Central American, West India, Colombian, 
Carthagena, and hog rubbers during the year 1891 amounted 
to 100 tons. See Case 100 [now Case 115], Museum No. 1. 
25781 A 
