2 
Esmeralda of Guiana may perhaps be aigro by Hevea sp. or 
Sapium sp. of the natural order Euphorbiace 
Colombian india-rubber and “ Carthagena " are one and the 
same thing, as is pointed out in the Kew Bulletin, 1890, p. 149 
[p. 132]. The tree yielding this rubber is Sapiwm biglandulosum 
of the natural order Huphorbiaceae, a widely spread and variable 
species ; it is also the source of Touckpong or Cithalateltt € 
of British Guiana. Case 96 [now Case 108], Museum No. 1, 
contains specimens of these rubbers 
Assam rubber is. the produce of bus elastica, a large tree of 
the p praia tribe of Urticaceae. The imports of Assam a pe 
Borneo ru bs 
Leuconotis, allied i of the natural order - Apougpsaidé (see 
Kew Report, 1880, p. 43) ; 200 tons of this rubber were imported 
med D comes during t n go R : Samples will be found in 
EL ase 75], M 
rubber is dep. e a species of the genus 
two other species, viz., L. the chief source of Mozambique 
rubber), and L. petersiana we also sources of the East African 
supply. 
On the west coast L. owariensis, which has a very wide distribu- 
tion, is the principal species furnishing Congo and Sierra Leone 
. florida, which occurs on the y^ coast, and 
Mannii also afford part ef the West African supply. "Liberian 
rubber is perhaps in part afforded by the “Abba” tree (Ficus 
Vogelii), of the poll ores soe tribe of Urticaceae, which has already 
been fully discussed in the Kew Bulletin for November 1886 
[p. 141] and May 1890 [p. 150]. 
Messrs. Hecht, Levis, and Kahn give the following statistics 
concerning these rubbers € 1 viz. ies cioe. an ea fare 4,350 
tons; Mozambique, 380 ton Madagascar, 300 t Case 71 
pow Case 75], Museum No. 1, “contains seni of tisso rubbers; 
The TET review of the sources of rubber supply from the 
commercial side has appeared in The India Rubber and Gutta 
Percha and Electrical Trades Journal, January 8, oe ae 
e merchantable in New York between 30 a 
: i 
England—one large and another small, one with little flavour and 
the other richer in food qualities. The — aide 
of rubber, however, is due in large to the methods 
ied e in gathering the sap. It tappéns d that the patiess of the 
