28 
ON THE OIL OF MONARDA. 
on spontaneous evaporation. The substance was purified for 
analysis by three distillations, and the combustion made in a 
current of oxygen. The author found — 
Carbon, 
79.77 
79.88 
80.00 
10 
80.00 
Hydrogen, 
9.25 
9.50 
9.52 
7 
9.33 
Oxygen, 
10.98 
10.62 
10.48 
1 
10.67 
If we regard this stearoptene as an oxide = C Jo H 7 + O, 
we find such a relation between its composition and that of the 
elaeoptene from which it separated, that it may assume in the 
eleeoptene 3 atoms of the same radical combined with 1 atom 
of oxygen =3C 10 H 7 +0, with which the per centage com- 
position found agrees tolerably well. 
When dry muriatic gas is passed over the solid stearoptene, 
it very quickly becomes brown, and after removal of the excess 
of acid purple-coloured. The effect is the same whether the 
mass be warmed or heated to boiling; on cooling it separates 
in dark purple crystals, which however consist for the greater 
part of unaltered stearoptene, as was to be expected, since the 
total increase in weight did not amount to more than 2 to 3 
per cent. On distilling the coloured crystals in a small retort, 
the stearoptene first passes over quite colourless, but the red 
compound likewise distils over unaltered. Caustic alkali turns 
the red colour to blue, and on the application of heat into eme- 
rald-green, both which colours gradually return to red on expo- 
sure to the air. The red mass yields a beautiful blue solution 
with hydrate of barytes. When carbonic acid is passed into 
this, the baryta is precipitated, and at the same time the colour- 
ing substance, which imparts a blue colour to the precipitate, 
which colour however subsequently becomes red. At last the 
entire precipitate is bright red and the precipitate colourless. 
The red colouring substance can be extracted with alcohol 
from the red baryta compound, and obtained in a solid state by 
evaporating the alcohol as a dark violet amorphous mass. It is 
volatilized by heat as a red gas, resembling indigo-blue, con- 
tains chlorine, and can be distilled without decomposition. — - 
Chem, Gaz. from Liehig's Annalen. 
