171 
e of British Honduras and Nica caragua is no doubt 
o wers. 
species named Castilloa markhamiana (Collins, Report on the 
Caoutchouc of Commerce, 1872, p. 12, t. 3) has been shown to 
belong to another genus, viz., Perebea (Genera Plantarum, Vol. HI., 
p. 372). 
Plants of Castilloa have been widely distributed from Kew to 
various tropical agg igs and seed-bearing trees are now found in 
Ceylon, Singapor Faget yee Pare Trinidad, and the west 
and east gs of "Arópial Afri 
* hirsutely tomentose beneath. On the other hand, Cross's 
“ indigenous specimens of Caucho, and those cultivated in Ceylon 
“ (derived. from wie same source), have the branchlets less clothed 
* toment 
sive brief statement respecting the determination of the 
raoe betes plants of Central America will serve to show the 
present position of our knowledge of the subject. 
The plants distributed from Kew, and now under cultivation in 
various tropical colonies, would be more correctly termed 
Yi . 
Nicaragua, 
quality of rubber yielded by the Darien Castilloa, the Kew Report 
for 1882, p. 40, gives an account of the first sample of caoutchouc 
obtained from this plant in the ‘Ola World. 
“ In October 1882, the Director of the Royal Botanic Gardens, 
* Peradeniya, Dr. Trime en, forwarded to Kew a sample of the 
“ Silver, Esq., F.L.S., who very kindly reported upon it :— 
T working and drying a portion of this sample, the loss is 12- 3 
« * per cent, ; it is necessary to use warm water in washing this 
& « rubber ; it becomes, on drying, much darker and shorter than 
“< washed sample gives 1:2 per cent. The shortness of this 
«e rubber would restrict its use to some extent where tens ile 
« < strength or tenacity is required.’ It was as valued, Dec. 8, 1882, 
& ag worth 2s. 9d. to 3s. per pound." 
The collection and preparation of rubbers as à e product 
has hitherto been almost exclusively in the hands of natives, 
