354 
Philippine Journal of Science 
1919 
known timbers, making it obnoxious to termites and keeping off rust from 
iron in contact with it. Seasoned teak has, however, a very unpleasant 
smell, which has been compared to that of old shoe-leather. It is distrib- 
uted in India, Burma, Siam, Ceylon, Java, Sumatra, and Celebes. In the 
Philippines small plantations occur in the southern islands, especially in 
Zamboanga district, Basilan Island. 
RELATIONSHIP BETWEEN THE RESISTANCE AND THE PHYSICAL 
PROPERTIES OF TIMBER 
It has been proved that some timbers are more highly re- 
sistant to termite attack than others; or, in other words, dur- 
ability of timber seems to be effected by its physical or chemical 
properties. Determination of the factor of resistance is highly 
important in order to discover the preventive measures against 
termites. Therefore, the relation of the physical properties of 
timbers to the resistance is considered first. 
Table XII . — Relationship between resistance and hardness of various woods. 
Wood. 
Degree of hardness. 
Damage. 
Per cent. 
4. 00 
8.00 
18. 42 
24.00 
do 
38.46 
39. 22 
Hard 
42. 86 
Very hard 
45. 45 
56. 00 
Hard 
60. 00 
60. 00 
60. 00 
60. 47 
60. 87 
65. 00 
Hard 
65. 52 
69. 23 
69. 77 
71. 43 
85. 45 
Hard 
85.71 
90.00 
Tables XIII and XIV are based mainly on the work of 
Gardner . 6 The result of the test obtained at Tainan is adopted 
in the tables to indicate the percentage of the damage. 
Bull. Philip. Bur. Forest. 4 (1907). 
