OCCURRENCE OF TERPENE TERPINENE. 531 
The pinene in the oil of EK. megacarpa was shown to be 
highly levorotatory, as was also the limonene; dipentene 
appears also to be present. The cineol content was 30%. 
It does not appear that the terpinene in this oil can exceed 
10%, judging from the results of the distillation and the 
amounts of other constituents determined. 
Although limonene tetrabromide was formed with the 
oil of the fraction boiling between 170—190° yet the result 
was not altogether satisfactory, and the compound small 
inamount. This peculiarity naturally led to further search 
for the interfering constituent with the resulting detection 
of the terpinene. 
Limonene rarely occurs in eucalyptus oils, and it may be 
that terpinene will be found more frequently associated 
with that terpene in the oils of certain species of this group. 
The formation of terpinene from terpineol through the 
terpene terpinolene is thus of special interest, because 
dipentene can also be formed from the same terpineol. 
Wallach and Kerkhoff! found that oxalic acid was a useful 
reagent by which to prepare terpinolene and then terpinene 
from terpineol. 
EK. megacarpa is a Western Australian species, and the 
oil was forwarded to the Technological Museum for investi- 
gation by Mr. C. KH. Lane Poole, the Conservator of Forests 
for that State. 
The formation of the terpinene nitrosite. 
A portion of the fraction distilling between 170—190 C. 
was mixed with an equal quantity of petroleum ether and 
an equal bulk of a saturated solution of sodium nitrite 
added, and afterwards sufficient glacial acetic acid to 
decompose the salt. The whole was then allowed to 
stand on one side. After twenty-four to thirty hours 
+ Ann. Chem., (275), 106. 
