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. 



ipil 



Molave 



Macaasim 



Mancono 



Aranga 



Banuyo 



Palomaria 



Dungon . 



Bansalaguin.. 



Tindalo 



Batitinan 



Pagatpat 



Betis 



Yellow narra . 



Calantas 



Tucang-calao . 



Amuguis 



Acle 



Guijo 



Red narra 



Supa 



Malugay 



Degree of hardness. 



Hard 



do.. 



-—do 



Very hard 



do 



Moderately hard- 

 Hard _-. 



Very hard 



do — 



Hard 



do. 



do 



Very hard 



Moderately hard. 



Soft 



Hard 



do 



do 



do 



Moderately hard 



Hard 



do 



Damage 



Per cent. 

 4.00 

 8.00 

 18.42 

 24.00 

 38.46 

 39.22 

 42.86 

 45.45 

 56.00 

 60.00 

 60.00 

 60.00 

 60.47 

 60.87 

 65.00 

 65.52 

 69.23 

 69.77 

 71.43 

 85.45 

 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). 



