756 Wisconsin Academy of Sciences, Arts, and Letters. 
The oil consisted largely of a-pinene, the nitrosochloride melt¬ 
ing at 103°. /3-pinene was present in very small amounts in 
contrast with the oil of P. ponderosa. The nopinic acid ob¬ 
tained melted at 125°. Limonene was identified by means of 
the tetrabromide, m. p. 104.5, and dihydrochloride, m. p. 50°. 
It will be noted that the turpentine oils from Pinus ponderosa 
and its variety P. p. scopulorum are distinctly different; the oil 
from the former is 1-rotatory and consists mainly of /?-pinene, 
while the oil from the latter is d-rotatory and consists largely of 
a-pinene. The decided difference between these oils is good 
evidence that the distinction between the species and subspecies 
should be maintained. 1 
The resin had the specific rotation [aJ D -30.95°. After pre¬ 
liminary digestion with alcohol containing hydrochloric acid, 
crystals of abietic acid were obtained melting at 159°. Three 
silver salts prepared from the abietic acid had an average silver 
content of 26.25%; silver abietate, Ag (C 20 H 29 O 2 ), requires 
26.37% silver. 
The turpentine oil of P. p. scopulorum has the following com¬ 
position: 60-70% d-a-pinene; 5% /?-pinene; and 20-25% lim¬ 
onene. The rosin consists of abietic acid. 
The Oleoresin of Lodgepole (Pinus contorta Loud.) 2 
The oleoresin gave on steam distillation 14.7% of oil having 
the following constants: d 15 ° 0.8518-0.8549 ; n D i 5 ° 1.4860-1.4862; 
[a] D -20.12°. 
About 82% of the oil distilled between 170-180° at atmos¬ 
pheric pressure. The residue remaining in the flask and 
amounting to 15% solidified on cooling to a hard amber-colored 
mass. The high degree of polymerization pointed to phellan- 
drene. This was confirmed by preparation of the nitrite melt¬ 
ing at 103°. A carefully purified sample of the phellandrene 
had the following properties: b. p. 60° at 11 mm.; d 2 P 0.8460; 
15 ° 
n D i 5 ° 1.4861; [a] D -12.36°. No additional terpenes could be 
detected. This occurrence of phellandrene is very interesting 
since it is the first recorded occurrence of phellandrene in the 
turpentine oils of any of the Pinus family. 
1 Schorg-er, Froc. Soc. Am. Foresters 11 (1916) 33. 
a Forest Service Bulletin 119, p. 25. 
