138 
Specimens. The trees have become so scarce in the most accessible 
parts that it is both troublesome and expensive to get samples, but 
I will do my best. 
I am, etc., 
(Signed) ROBERT B. WHITE. 
W. T. Thiselton-Dyer, Esq., 
M Royal Carias, Kew. 
ose eaf with its scaly parems and peculiar 
glands (? G) sk e; "The leaves are alternate whorled. 
[There could be little doubt that this leaf belonged to a form of 
Sapium biglandulosum.] 
Mr. R. THOMSON to ROYAL GARDENS, KEW. 
162, Belsize Boag, London, N.W. 
SIR, l4th May, 1890. 
l ITH reference to the conversation I MÀ with Mr. zag orris, 
the Assistant Director, on the 26th ultimo, on the subject of my 
correspondence with the India Office pontine to the “troduction 
into India of the cultivation of Colom en rubber, I 
respectfully beg leave to submit the owing rem 
As I informed Mr. Morris it is to be regretted na your letter 
n this subject, Le: to me in Colombia, never came to hand. 
now have to thank you for a-copy of cea wet letter dated the 
pe July, 1839, whee I received some day 
Having informed Mr. Morris that I Dites dee wings of the 
inflorescence, &c., of this species of rubber, at his suggestion I 
submitted the same to Professor Oliver (Keeper t ped erase en 
variable tropical Ameriean species, and known rubber producer." 
Subsequently the Professor showed me the Kew Herbariu 
specimens of Sapium biglandulosum, obtained from British 
. Guiana, &c. 
My i mpression, judging from these specimens, is that the 
Ob Virgen is quite a distinct species. In the latter there is 
very slight variation in the size of the leaves, whereas in the 
Guiana specimens the variation is extremely marked. "The leaves, 
imd in the Colombia Virgen are in point of size several times larger 
e others. Also the glands at the base of pe leaves are 
overal times larger than those in the Guiana specimens. 
n addition to the rubber-yielding species in qid 
cies 
milky juice, which, however, does not kvali te on exposure to 
the air, as is the case with the e peng species. Thus, on 
these kinds the deg ie juice not coagu decur n exposure to the fni 
grows, two very pie ies o genus abound. ` Thè 
latter are easily distinguished by the rubber E solleelors (coucheros) 
by the size of the fall len EN as well as b ize, colour, and 
texture of the trunk, . loliage, inata axi] -scedu ere small 
