205 
d. No tap 
experiments had been made, but a drop of the latex is stated to 
appear to be decidedly rich in rubber (Trop. Agric. xxxii, May, 
1909, p. 411). 
ood illustration of the young trees in the experiment station 
at Peradeniya accompanies the article. In November the previous 
account was supplemented by a further article on Manihot dichotoma 
(Trop. Agric. xxxiii. Nov. 1910 p. 385) which occupied a three-acre 
plot at the experiment station. The average girth of the 98 trees 
on the plantation was at the time of writing 9 in. at 3 ft. from the 
ground. The 14 largest trees, however, showed an average circum- 
ference of 14 in. A second plot planted in November, 1908, 
2 x 12 ft. apart, had at the end of the first year a girth of 6 in, and 
were “already producing seed in considerable quantity.” ‘The land 
on which these trees were grown was kept cultivated and this 
treatment appears to have been beneficial. The plants of 
M. dichotoma raised from seed are said to be extremely variable 
in vegetative characters, especially as regards leaf shape and also 
the capsules. On some trees the capsules are smooth—like those _ 
of M. Glaziovii but larger—whilst on others they bear high crinkled 
ridges or wings. it appears that the trees which resemble Ceara 
as regards leaves usually differ widely in respect of the capsules 
and vice versd, but there is said to be no difficulty as to confusing 
the two species. 
The winged capsules of this species are well shown in the figures 
in Hooker's Icones Plantarum, vol. xxix, tt. 2876, 2877, which 
were prepared from material sent to Kew by Mr. J. A. Davy, 
iberiio Preto, Sio Paulo, Brazil. 
The variability exhibited by the trees suggests that the rubber 
yield may also be variable and indications to this effect have been 
noticed in Ceylon. Although the twelve trees tapped were only 
2 years old and the rubber yield was small, “more than ten times 
as much rubber was yielded by the best as by the poorest yielder. 
Care should be taken therefore to insure that seeds or cuttings 
should be used from those trees only whose yield of rubber is high © 
and this caution is doubtless equally applicable to the selection of 
seed from Hevea brasiliensis. A short note on the growth of 
Manicoba rubber trees in the Malay Peninsula appeared in the 
number (11) of the Agricultural Bulletin of the Straits and Federated 
Nevtishar 1909, p. 522. The seedlings of 
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