522 Philippine Journal of Science 1919 
Records of yields from an estate in the Federated Malay 
States ** indicate that trees 6 years old produced 215.5 kilo- 
grams per hectare (192 pounds per acre) ; trees 8 years old, 
a yield of 288.5 kilograms per hectare (257 pounds per acre) ; 
and trees 9 years old, 401.9 kilograms per hectare (358 pounds 
per acre). This yield may be compared with that at Basilan 
for trees (most of them only 4 to 6 years old) which, assuming 
there were 331 trees per hectare (134 per acre), amounts to 
about 241 kilograms per hectare (215 pounds per acre). 
Carruthers ** reports that in 1907 the average yield of dry 
rubber over the entire Malay Peninsula amounted to 0.79 kilo- 
gram (1 pound, 12 ounces) per tapped tree, and in Selangor 
0.65 kilogram (1 pound, 7 ounces) per tapped tree. The aver- 
age yield obtained in Malaya in 1907 compares perhaps most 
closely with the yields obtained in Basilan of any records avail- 
able, since in both cases the trees were young and a very high 
percentage of the total number was tapped for the first time. 
Johnson * gives records of the yield obtained on a number 
of Ceylon and Malayan estates. The average of yields from 
fourteen estates in 1905 was 0.61 kilogram (1.35 pounds) per 
tree. The total number of trees considered was 80,272. The 
greatest yield recorded was 1.47 kilograms (3.25 pounds) per 
tree but that was for only 100 trees. The greatest yield for a 
large number of trees was 1.32 kilograms (3 pounds) per tree 
for 10,000 trees. The average of the yields from twenty-two 
estates in 1906 was 0.67 kilogram (1.47 pounds). The greatest 
yield recorded was 3.23 kilograms (7.11 pounds) per tree 
for 807 trees. The average of yields from eighteen estates 
in 1907 was 0.83 kilogram (1.83 pounds) per tree. The highest 
yield was 1.49 kilograms (3.28 pounds) per tree for 68,236 
_ trees. 
A discussion of the records of yields obtained from Para 
rubber could be continued indefinitely, but it is believed that 
sufficient data have been presented to show that the yield ob-— 
tained from Hevea on Basilan compare favorably with that ob- 
tained from young trees in Malaya and Ceylon. 
“India Rubber Journ. No. 22, 53 (1917) 14, 
“ Agr. Bull. Straits & F. M. S. 7 (1908) 582. 
“The Cultivation and Preparation of Para Rubber. London (1909) 
149-152. 
