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 = 6*00 = 8-35 

 4 _ Oxygen = 32-00 = 27-73 



1 Hydrospiroilic acid 1 11 -56 100-00 



The combination of tlie 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. 



0.1 74 grm of the compound with copper yielded 0-324 c. a. 89-58 carbon 

 0-174 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. 



If now in the cupreous combination the copper is considered to have 

 been in the metallic state we obtain 



Carbon = 89*58 or 51-48 



Hydrogen = 5-99 — 3-44 



Oxygen = 38-71 — 22-20 



Copper = 39-72 — 22-88 



174-00 100-00 



which in eq. 



12eqs. Carbon 73-56 or 51-71 



5_ Hydrogen 5-00 — 3-51 



4 _ Oxygen 32-00 — 22-51 



1 — Copper 31-70 — 22-27 



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 



