97 
“ The tappings may follow one another at intervals of a week 
for about four to eight weeks. The second tapping gives a much 
OZ, 
First week ... sis "a - ids 73 
Second a: js sta : EM eioira di 
hird ; 4 : 
Fourth ,, 80 
Fifth. .,, 61 
Sixth  ,, :02 
Total vi ns AT 
* Yield.—The statements as to yield of rubber found in books of 
travel and popular artieles are very unreliable, and experiments 
8 
are being made to test 
a yard from the ground. 
^It was tapped on seven days between January 25th and 
February l5th, yielding 17} oz. of rubber, on six days between 
July 20th and August 29th, yielding 7 oz. and on four days 
between December 6th and 20th, yielding 44 oz., a total of 1 Ih. - 
123 oz. The same method was followed in alternate years, with 
results as shown below :— 
Ib. oz. 
INS. -a ess FS va be 1 123 
MOU. ves P e" erc E I8 
1892 2 13 
1894 ‘ 3.3 
1896 3 0 
Total :.... wu dg. | 
“The average yield of this tree from the twelfth to the twenty- 
first year is thus almost 1} lb. per annum. This result is very 
e 
1897, and that therefore this yield, if the tree tapped 
as a fair sample, represents rather the result to be expected after 
twenty years, by which time the average girth of the trees should 
to the acre. These data thus indicate a yield of about 90 Ib. of 
rubber per acre in the twentieth year, a result insufficient to 
make.it worth the while of private planters to take up rubber 
eultivation. 
“ It seemed probable that betier results might be obtained by 
tapping younger and smaller trees more closely planted, and 
experiments were therefore begun in 1896 on a younger planta- 
tion of trees at Henaratgoda, The mean girth in January, 1897, 
G 
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