630 PROFESSOR FREDERICK GUTHRIE 
The upper layer is poured into water, whereon the zinc-ethyl is decomposed, 
and the alcohol formed is dissolved, while the precipitated oxide of zinc carries 
with it most of the bisulphide of cenanthyl, either in a purely mechanical manner, 
or in astate of the feeblest union. The pale-yellow mass so obtained is drained on 
awet filter, then boiled and exhausted with strong alcohol. This gives an alco- 
holic solution (@) of bisulphide of cenanthyl, and an insoluble residue, consisting 
of pure oxide of zinc. 
The lower layer* is also treated with water, whereupon chloride of zinc is 
dissolved out, and a liquid separates. The latter is dissolved in alcohol, and added 
to the solution a. 
The mixed alcoholic solution is then heated in a water-bath, until most of the 
alcohol is expelled. Finally, it is washed with water, and dried over chloride of 
calcium and a few fragments of caustic potash. 
On distillation, a few drops pass over about 140° C.; this is probably a little 
bisulphide of ethyl. 
The great bulk passes over at 240° to 250°C. On rectification, its boiling point 
is nearly constant at 243° C.}+ A slight residue is formed on each distillation. 
On analysis,— 
(1.) 0-2730 grms. gave 65°31 per cent. of C., and 11-22 of H. 
(2.) 0:4122 grms, gave 65:42 per cent. of C., and 11:26 of H. 
(3.) 0°4186 grms. gave 23-72 per cent. of S. 


Ci, na le S, Found— 
requires, 1. Er. III. 
C= 64:12 65°31 65:42 65°36 | yy 
H=11-46 11-22 11:26 hess eve 
S=24-42 ii Hi 23°72 
100-00 100-32 
The rather large excess in the carbon, and the defect in the sulphur, are per- 
haps owing to the presence of some monosulphide of cenanthyl. The bisulphide 
of cenanthy]l is a light-yellow liquid, of perfect limpidity. Its smell is exceedingly 
offensive. It is quite insoluble in water, but readily soluble in ether and alcohol. 
Towards the oxides of lead and mercury it shows perfect indifference. 
The so perfect reactional analogy between the bisulphochlorides of ethylen and 
of amylen, which I have had the honour of pointing out, and the perhaps equally 
well-established resemblance between the compounds of methyl, ethyl, and amyl 
* The physical properties of this body, and the large quantity of liquid which water separates 
from it, seem to point to its being a compound of chloride of zinc, with bisulphide of cenanthyl. 
+ Bisulphide of ethyl boils circa 150° C. If Kopr’s law hold good, a successive increment of 
19° C. for every C, H, would point to 245° C. as the boiling point of bisulphide of enanthyl, But 
in the cases of other bisulphides, a common increment of 33 would more nearly represent experi- 
mental results. Hence it is possible that this substance may only be an isomer of bisulphide of 
cenanthyl. 
= i ear oe ee 
