532 H. G. SMITH, 
a 
crystals commenced to form, and increased considerably in 
amount after two days. The crystals were separated, 
pressed on porous plate to absorb the liquid products, and 
purified from a mixture of alcohol and chloroform. The 
terpinene nitrosite thus formed melted at 155°C. (corrected), 
and answered to the more easily applied chemical reactions 
for this substance. 
Terpinene nitrosite, which is a more stable substance 
than the corresponding compound formed with phellandrene,, 
has had two formule suggested for it :— 
N=O ZN—O-H 
Le a ; 
but no definite conclusion has yet been arrived at. 
and Oi0Hi15 
Treatment with Beckmann’'s reagent. 
A portion of the fraction boiling between 170 —190° was. 
repeatedly treated in the cold with small quantities of 
Beckmann’s chromic acid mixture, until the formation of 
the brown precipitate was less noticeable. The optical 
rotation of the fraction before treatment was 35°5 degrees. 
to the left, due principally to the limonene. After the first 
treatment, the optical activity had increased to36’4 degrees, 
and after further action reached 36°6 degrees. The sub- 
stance removed in this way was evidently the inactive 
terpinene, while the optical activity of the limonene had 
apparently not been interfered with. 
If Wallach’s statement that the «form produces the 
crystalline nitrosite is accepted, and assuming that the 
terpene is not a mixture of the «- and y-forms, then the 
terpinene in the oil of this Hucalyptus species has the 
molecular structure I above. 
HK. megacarpa, in the sequence of species, more nearly 
approaches the first members of the genus, or those with 
the parallel feathery leaf venation, than the more recent 
