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- 
- egumference 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.* 
Increment, six 
Age in years. 1904 1905 1906 1909 years. 
ROOT Sou 
cm. |Inches.| em. |Inches.| em. |Inches.| cm. |Inches.| cm. | Inches. 
ORB Fede -| 44.77 178 | 54.61 214 | 65.72 253 | 89.85 35g | 45.09; 172 
So ee 45. 88 188 | 58.55 234 | 68.80 27% | 91.68 363 | 45.75 | 188 
Ey | Pesce 115. 57 45% | 120.97 47% | 129.54 51 | 149.28 583 | 33.02 18 
| Nee 278.18 | 109% | 283.84 | 1113 | 288.92) 118%] 806.07| 1204| 27.94 ul 
* From Agr. Bull. Straits & F. M. S. 9 (1910) 257. 
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. 
