Chemistry and Physics. 311 
The oil itself, even after washing, gave both the starch and the 
chromic acid tests. On repeating these tests in vacuo, no differ- 
ence was observed. Hence it appears that oxidized oil of turpen- 
tine contains, even after washing, a body with the reaetions of 
hydrogen dioxide. To test this hypothesis, the oil was treated 
with lead peroxide, manganese peroxide and sodium hyposulphite. 
All these substances appeared to destroy the active agent, but in 
a decreasing order. If attached oxygen be the active agent, it . 
x ust be more stable than ordinary ozone, which is at once fe 
stroyed by the hyposulphite. Noticing that heat, so far fron 
destroying the active agent, noone increased it, equal volumes 
of turpentine oil and water were 
either reagent. The active principle present can therefore be 
The author mentions in addition, two ar reactions of thi 
active turpentine. In the one, the oil converted yellow mercuric 
oxide into a black powder, losing at the same time its activity. 
In the other, a mixture of the oil and acidulated water being 
8 : G. F. B. 
8. Acti the Copper-zine Couple on the Chlorides of Ethy- 
t Bhaditen TONE a RIBE have continued their 
the ; 
tion on ety fons and ethylidene chlorides, which are isomers 
>. The former had a specific gravity 
of 1-272 at 14°, and its refractive index for A was 174448, — The 
latter—prepared from ethyl chloride by the action of chlorine— 
1 fo 
the ethylidene chloride was aay rele < 34°6, that of the 
ethylene chloride 34°5; theory gives 35. 
e ] : 
the boiling temperature. presence of water a 
z in presence of alcohol the action was more 
