Schorger—Chemistry of American Conifers. 
755 
tainted that melted at 102-106° after two crystallizations from 
alcohol; after a third crystallization the m. p. was 101-103°. 
When inoculated with cadinene dihydrochloride, m. p. 118°, a 
crop of crystals were obtained that melted at 118°. It is prob¬ 
able that a small amount of cadinene is present, although the 
dihydroehloride of this sesquiterpene usually crystallizes with 
ease. 
According to patents held by Schering and Company, 1 /3-pin- 
ene is stated to give much larger yields of isoprene than a-pin- 
ene. Since the oil of western yellow pine could be rendered 
available in large quantities and since it contained so large a 
proportion of /3-pinene it was desirable to investigate the above 
statement. An improved form of the Harries isoprene lamp 
was constructed. With this apparatus, however, it was found 
that both a-pinene and /?-pinene gave practically the same yield 
of isoprene, namely 10%. 2 
The colophony had the specific rotation [a] d- 12.88°. The 
crystals obtained by digesting the powdered colophony with 
alcohol containing hydrochloride acid followed by recrystalliza¬ 
tion from acetone melted at 159-160° and had the specific rota¬ 
tion [a] D -78.44°. The crystals obtained from dilute acetone 
had the characteristic shape of abietic acid. The identifica¬ 
tion was checked by analysis of the silver salt; found 26.25% 
Ag; calculated 26.37%Ag. The resin crystals obtained from 
the rosin distilled under reduced pressure melted at 150-151° 
and had the specific rotation [a] D -54.28°. 
The volatile oil 3 contains about 5% 1-a-pinene; 60% l-/?-pin- 
ene; 20% 1-limonene; and about 10% of a sesquisterpene which 
appears to be cadinene. The rosin contains about 90% abietic 
acid. 
The Oleoresin of Western Yellow Pine, Variety Scopulorum 
(Pinus ponderosa scopulorum Englem) 4 
The oils contained from oleoresins collected in Arizona had 
the following properties: d 15 ° 0.8639-0.8672; n Dl5 ° 1.4723- 
1.4729; [a] d+ 12.86 to + 13.03°. 
1 German Patent 260,934; K. Stephan, U. S. Patent 1,057,680 (1913) 
(Assignor to Schoring and Company). 
2 Jour. Ind. Eng. Chem. 7 (1915) 924; with R. Sayre. 
3 Adams [Jour. Ind. Eng. Chem. 7 (1915) 957] working in Wallach’s 
laboratory reached the conclusion that the oils distilled from the wood of 
western yellow pine, digger pine, singleleaf pine, have about the same com¬ 
position as the author had found for the oils from the oleoresins of the same 
species. 
4 Forest Service Bulletin 119, p. 15. 
