2/9 
For comparison’s sake quite a large number of chemical tests give. 
Fine Para 
Medium Para 
Ceylon 
Rubber. Resin. Loss. 
% % % 
96.6 3.4 17 
95-2 4-8 17 
97*5 2.5 say 3 7 
Yours faithfully, 
Robert Kay Gay,’ 
Managing Director. 
Harburg and Vienna India Rubber Works. 
Harburg-on-Elbe, June 19th, 1909. 
Botanic Garden Singapore, 
Straits Settlements. 
Dear Sir,- -As promised you by our Mr. Hoff, in his letter to you 
of 25th ult., we have the pleasure to give you the following report on 
the examination and tests made with the two samples of Eastern Para 
rubber cured by the Brazilian method of smoking. 
We received the following samples:— 
Sample I. The rubber is of very good elastic, and tough quality, 
dark yellow in colour, with a smell like hard cured Para. 
Loss by washing ... ... ... 21, 8 X 
Extracted with alcohol ... ... 4, 4 % 
„ alcoholized potash ... 2, I % 
Ash ... ... ... ... ... 0, 6 % 
Melting point ... ... ... ... 155° C. 
Sample 2. -The rubber is of good elastic and tough quality some- 
what yellower in colour than No. I, however, not so good as the same. 
with smell the same. 
Loss by washing ... ... ... 13, 0% 
Extracted with alcohol ... ... ... 4, 1 7 
* „ „ alcoholized potash ... 2, 1 % 
Ash ... ... ... ... ... 0, 42 
Melting point ... ... ... ... 155' C. 
For comparison in the examination. Fine hard cured Para, Ceylon 
Crepe of light colour, Ceylon Cr6pe of darker colour, and Prime Con- 
go were used. We beg to remark, however, that the name- of the 
Estate and the age of the trees, from which the Ceylon sorts were 
obtained were unknown to us, and we are of opinion that the materials 
at hand for comparison do not represent really first class Ceylon Para. 
It would be desirable to obtain from the Botanic Gardens, Para, which 
through careful coagulation by chemical means of the latex gathered 
from trees of corresponding age, and by careful washing, would give 
an authentic table for comparison. 
Henry N. Ridley, Esq., 
Director. 
