364 Philippine Journal of Science 1919 



while above that temperature they are yellowish and become 

 highly viscous. 



The crude crystals separated from the oil were dissolved in 

 absolute alcohol and forty-three parts of water were added. 

 Then the solution was cooled in order to precipitate the crystals. 

 Under atmospheric pressure it was sublimated again, and the 

 pure crystals were obtained. 



I. 0.2319 gram of crystals gave 0.6822 gram C0 2 and 0.2442 gram H : 0. 



II. 0.2159 gram of crystals gave 0.6381 gram C0 2 and 0.2268 gram H,0. 



Required for Fojnd. 



C 3 H260. Per cent. 



Per cent. j jj_ 



C 81.08 80.23 80.61 



H 11.71 11.69 11.76 



These percentage numbers agree quite well with those of 

 sesquiterpene alcohol. The molecular weight of the crystals 

 (231 to 234) also approximates that of the sesquiterpene alcohol 

 (222). Such being the case, there is no doubt that the crys- 

 talline substance contained in Foochow cedar is a sesquiterpene 

 alcohol. 



Mr. K. Kafuku studied this crystal in detail and expressed 

 the view that cedrol, a sesquiterpene alcohol that has been ex- 

 tracted from red cedar {Juniperus virginiana L.), is the same 

 substance. 



Table XXIII. — Comparison of Foochow cedar crystals with cedrol. 



Melting point--, <>C__ 



Boiling- point °C__ 



Optical rotatory power degrees,. 



Foochow 

 cedar crys- 

 tals. 



292 to 204 

 •+10.9 



Cedrol. 



86 to 87 



291 to 294 



b+9.5 



a In 10 per cent chloroform solution. b In 11.3 per cent chloroform solution. 



Cedrol, the principal ingredient of Foochow cedar oil, is not 

 identical with guajol. It is a striking fact, however, that both 

 cypress pine and Foochow cedar, which are said to be highly 

 resistant to the attack of termites, contain antiseptic compounds 

 that belong to the same group, the sesquiterpene alcohols. 



Besides Foochow cedar, another species is contained in the 

 genus Cunninghamia. A few years ago, Dr. B. Hayata described 

 this species from Formosa, giving it the name Cunninghamia 

 konwhii. At present it is not known whether it is resistant to 

 the attack of termites or not ; but, as it is very closely allied to 



