518 
Philippine Journal of Science 
1919 
In the same figure are also plotted the figures given in Table 
XV for the growth of trees at Edangoda, Ceylon, and also the 
second of the two series of measurements of trees 5 to 9 years 
old given in Table XII. 
From Table XI it appears that the annual increase in cir- 
cumference of trees up to 10 years of age averages 8.6 centi- 
meters. Ridley gives measurements of trees in Malaya which 
approach very closely those recorded for trees in the Philippines. 
Table XII is copied from Ridley’s paper, with the measurements 
reduced to centimeters. 
Table XII . — Growth of trees in Malaya.' 
Age in years. 
1904 
1905 
1900 
1909 
Increment, six 
years. 
cm. 
Inches. 
cm. 
Inches. 
cm. 
Inches. 
cm. 
Inches. 
cm. 
Inches. 
5 
44.77 
17i 
54.61 
211 
65.72 
251 
89.85 
35i 
45.09 
171 
5 
45.88 
18| 
58. 65 
231 
68.80 
27| 
91.63 
36f 
46.75 
H9 
00 
16 
115. 67 
45f 
120. 97 
47| 
129. 64 
51 
149. 23 
58i 
33.02 
13 
28 - 
278. 13 
1091 
283.84 
ml 
288. 92 
1131 
306. 07 
1201 
27.94 
11 
“ From Agr. Bull. Straits & F. M. S. 9 (1910) 267. 
His measurements of trees from 5 to 9 years of age indicate 
a somewhat faster growth than is shown by trees in Basilan, but 
this may be due to the effect of close planting on the latter. In 
the same paper Ridley shows that in a block of closely planted 
trees the outside trees grew 20.3 centimeters in six years, while 
those inside grew only 10.3 centimeters during the same period. 
He also states that he considers a growth under fair conditions 
of 7.6 to 10.2 centimeters (3 to 4 inches) per year, for trees 
from 5 to 15 years of age, to be satisfactory. The average yearly 
increment of all trees measured in the Philippines appears to 
be about 8.6 centimeters (3.4 inches). An average of ninety- 
seven trees in block 18 indicates a growth of 47.8 centimeters 
(18.0 inches) in fifty-one months, which amounts to about 11.2 
centimeters (4.4 inches) per year. 
Ridley * gives the measurements of some trees growing under 
jungle conditions in the Singapore Botanic Gardens. A copy of 
his table appears in Table XIII with the measurements reduced 
to centimeters. The trees were planted about ten years before 
the first measurements were made. He states that they are 
fully twice as large as trees grown under cultivation. 
’Agr. Bull. Straits and F. M. S. 9 (1910) 25. 
* Agr. Bull. Straits & F. M. S. 7 (1908) 254. 
