352 Philippine Journal of Science 191 9 



Such being the case there is no doubt that the volatile constituents 

 of cypress pine are effective in preventing the attack of termites. 



SUMMARY 



1. Cypress pine contains about 1 per cent of volatile constituents. 



2. The volatile constituents are effective in preventing the attack of 



termites. 



3. The principal ingredient of the volatile constituents is guajol, which 



is said to be highly antiseptic. The oil contains about 60 per cent 

 of guajol. 



4. The volatile constituents of cypress pine contain a small amount of 



unknown acids and phenol. The latter seems to be callitrol. 



THE VOLATILE CONSTITUENTS OF TEAK 



In 1887 Romanes 9 made an investigation on the volatile con- 

 stituents of teak. According to his statement the alcohol ex- 

 tract of teak does not contain volatile oils, but consists mainly 

 of resinous substances. By means of distillation an amber- 

 colored crystal, which he named tectoquinone (C 18 H, 6 2 ), was 

 separated from the resinous substances. It is reported to be 

 soluble in alcohol and melts at 171° C. When it is reduced with 

 zinc powder and acetic acid, a hydrocarbon C, S H 22 is obtained. 



In order to test this statement, 600 grams of sliced teak were 

 extracted with alcohol. By means of steam distillation a fine, 

 amber-colored crystal was separated from the extract. It is 

 more or less soluble in water. When it is recrystallized from 

 a dilute alcohol solution, it separates into two parts; one part 

 is pale yellow, while the other is deep yellow. At present nothing 

 can be said about the nature of this crystal nor of the resinous 

 substances, because the materials at hand were insufficient to 

 continue the investigation. 



THE VOLATILE CONSTITUENTS OF FOOCHOW CEDAR AND RANDAI 



CEDAR 



In 1916 at Foochow, South China, I found that the Chinese 

 people were using Foochow cedar (Cunninghamia sinensis R. 

 Br.) as the principal building material, claiming that the timber 

 is highly resistant to termite attack. It is certain, however, that 

 the immunity of Foochow cedar is not absolute, because the 

 Chinese houses in Formosa are attacked by the termite, although 

 they are mainly constructed of Foochow cedar. 



As a result of inspection of many infested buildings in Foo- 

 chow I came to the conclusion that the heartwood of Foochow 



*Proc. Chem. Soc. London (1887) 4-116. 



