156 DR. LOWIG ON THE ESSENTIAL OIL 
from whence we may deduce the following eq. 
in 100 parts 
12 eqs. Carbon = 73°56 = 66°92 
6 — Hydrogen = 600 = = 835 
4.— Oxygen = 32:00 = 27°73 
1 Hydrospiroilic acid 111°56 100°00 
The combination of the oil with copper was also subjected to analysis. 
This compound was obtained by agitating together an aqueous solution 
of the oil with freshly prepared quite pure hydrated oxide of copper, 
taking care that the oil should be in excess; and the green compound 
thus obtained was dried at + 160°. At this temperature the combi- 
nation is not decomposed, which is evident, as the oil may again be ob- 
tained unaltered on the addition of an acid. By other means, by dou- 
ble decomposition for instance, the combination with copper may be 
obtained, but not quite pure, as it then contains slight traces of the acid 
which was united with the copper, even if excess of alkali be employed 
as a precipitant. 
0°174 grm of the compound with copper yielded 0°324 c. a. 89°58 carbon 
OL t§ —————_—___--—. 0°054 water 5°99 hydr. 
Also by burning the cupreous combination in contact with the air, 0°130 
of the compound yielded 
0:03719 oxide of copper 29°68 copper. 
Ww 
If now in the cupreous combination the copper is considered to have 
been in the metallic state we obtain 
Carbon 
= $8958 or 5148 
Hydrogen = 5999 — 3744 
Oxygen = 38°71. — 22:20 
Copper = 39°72 — 22:88 
17400 100-00 
which in eq. 
12S CAMPO cesc.csectte secon co: (356° or ~ 51°71 
5 — Hydrogen .................. 500 — 3°51 
4 — Oxygen..................---3200 — 22°51 
1 — .Copper .....scssansertcvensdl 10, — 29-97 
1 eq. Spiroilide of copper...... 142-26 100-00 
These experiments confirm the truth of the above-mentioned view, 
that the oil is a hydracid with a ternary base, and they likewise show 
that the action of this hydracid with metals is exactly the same as that 
of those which were before known. 
This view receives still further confirmation by the fact that when 
