92 Timehrt. 
During the past two years specimens have been obtained in the colony that 
approximate very closely to H. Spruceana in character, and the investigations 
that are now in hand will doubtless determine whether or not this species exists 
in British Guiana. The fruits of H. Spruceana have not been described, but those 
of the species found in this colony, apparently very closely allied to it, have 
large fruits—the seeds being considerably larger than the seeds of H. brasiliensis. 
These seeds are usually long and narrow while the upper surfaces are distinctly 
rounded. This species (supposed to be H. Spruceana) is in cultivation in some 
situations in the colony. 
Hevea confusa is the most widely distributed of our local Heveas. It was first 
collected by the Schomburgks and abundant material was obtained by Mr. 
Jenman from the Mazaruniand Essequibo rivers. Seeds distributed to foreign 
Botanical Gardens have been germinated and this species is represented in 
several of them. It is also being grown in three localities in this colony, and an 
opportunity was recently offered to investigate the product of this tree under 
cultivation. It grows to 60 feet in height, and the bark is smooth except for a 
few short blunt spines. The leaves are smooth and the petioles are long. The 
petioles are surmounted at their apices with three or four glands and the 
leaflets have their greatest breadth about three-quarters the way up. The 
flowers are few in number and the ovaries are smooth. The fruits are believed 
to be smaller than those of H. Spruceana, but the seeds appear to be relatively 
larger than are the seeds of H. brasiliensis and are truncate. The original papers 
of Mr. Jenman on the “rubber” trees of the colony, in which he drew attention 
to the large number of “ hatties ” scattered throughout our forests and suggested 
that the “ rubber ” might be of commercial value, gave the identification as H. 
Spruceana, but it is now generally conceded that the trees to which he was referr- 
ing were generally H. confusa. 
H. pauciflora is scattered through our forests and is common in the Pomeroon. 
In its botanical character it differs but little from H. confusa. Its leaves are 
usually thin and have their greatest breadth about half way, while the seeds are 
small and rounded. The ovary is hairy. There is reason to believe that the 
differences, given above, between H. pauciflora and H. confusa are not constant 
and that they may really be variations of a single species, but until complete 
material has been obtained and carefully examined no definite conclusion can be 
arrived at. 
Samples of the ‘“ rubber ” from the different local heveas have been obtained 
from time to time and submitted for chemical analysis. All the samples 
have been of high-resin-content, and were of little or no commercial value. 
The yields of individual trees are usually small, and from the recent tappings 
of cultivated trees of H. confusa both in this colony and in Jamaica it appears 
that the yields are no greater under cultivation than under forest conditions 
nor is the product of any greater value, The latex is slightly yellowish in colour, 
and coagulates slowly. The product obtained is a highly plastic mass, to a large 
extent devoid of tenacity and showing an almost complete absence of nerve. 
Pure “ rubber ” separated from it has the same characteristics. 
Recently specimens of leaves of another hevea have been obtained from the 
Potaro district. These differ in character to any of the heveas above described, 
