750 Wisconsin Academy of Sciences, Arts, a/nd Letters. 
be further characterized. About 13% of “green oil” was pres¬ 
ent in the higher fractions. It had the following properties: 
b. p. 255-260°; d 15 ° 0.8963; n Dl5 ° 1.4952; specific rotation [a] D 
-6.05°. A drop of the oil when dissolved in glacial acetic acid 
and then treated with bromine vapors, gave a purple solution, 
becoming deep blue. . Attempts to prepare solid derivatives 
such as the bromide, hydrochloride, nitrite, nitrosochloride, 
etc., were unsuccessful. A careful study of this “green oil”, 
characteristic of so many of the conifer leaf oils, should prove to 
be highly interesting. The material, however, has been difficult 
to obtain. 
The ‘ ‘ green oil ’ ’ will probably prove to be related to the ‘ ‘ blue 
oil” (azulene) found in numerous volatile oils. 
The composition of the oil is approximately the following: fur¬ 
fural, trace; a-pinene (?); l-/?-pinene 16-18%; 1-phellandrene 
52% ; ester as bornylacetate 3.5% ; free alcohol as borneol 75%; 
“green oil” 13%. 
The Leaf and Twig Oil of Incense (Libocedrus decurrens 
Torrey) d 
Nine samples of oil distilled from normal material in the regu¬ 
lar manner had the following range of properties: d 15 ° 0.8655- 
0.8733; n Dl5 ° 1.4754-1.4775; a D20 ° -3.20 to +38.68°; acid No. 
0.48-0.74; ester No. 19.19-24.27; ester No. after acetylation 
28.64-39.83; average yield of oil 0.225%. The variation in the 
optical rotation is very pronounced. 
A quantity of leaves and twigs that had been thoroughly mixed 
was divided into three portions; the first portion was distilled 
while fresh, and the second and third portions were distilled after 
having been stored two and four weeks respectively in the open 
air. Analysis of the three oils obtained showed a remarkably 
close agreement in all of their constants, showing that the storage 
had been without perceptible influence. It is interesting to note 
that there was a slight increase in the yield of oil from the stored 
material even when the calculation was based on the original 
green weight. 
In one case the distillate from a charge of leaves and twigs 
was caught in four fractions and these fractions were examined 
separately. The properties of the first fraction differed slightly 
J Jour. Ind. Eng. Chem. 8 (1916) 22. 
