362 
Philippine Journal of Science 
1919 
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 ]8 H 16 0 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 18 H 22 is obtained. 
In order to test this statement, 600 grams of sliced teak we re 
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 
9 Proc. Chem. Soc. London (1887) 4-116. 
