184 Prof. Bunsen on Kakodylic Acid, 
Wavellite. If analcoholic solution of the acid be boiled with 
an alcoholic solution of chloride of copper, a greenish yellow 
pulverulent precipitate is formed, which consists of 7 atoms of 
chloride of copper and 1 atom of bikakodylate of copper. 
Sulphurets of Kakodyl. 
Kakodyle combines directly with 1 atom of sulphur, when 
both substances in a perfectly dry state are brought together ; 
the same compound may be formed by distilling chloride of 
kakodyl with sulphuret of barium. This compound is, as I 
have already stated, fluid, and does not solidify at a very low 
temperature. If more sulphur is added another atom of it is 
taken up by the radical, and it becomes a white solid mass so- 
luble in eether, from which it can be obtained in large, oblique 
quadrilateral prisms. ‘This compound possesses the property 
of combining with more sulphur when the dry substance is di- 
gested with it: it forms a confused mass of acicular crystals. 
The behaviour of sulphuretted hydrogen with the kakodylates 
of the alkaline bases, renders itvery probable that this acicular 
compound is analogous in composition to the kakodylic acid ; 
it can only exist in an anhydrous state, and by treatment with 
solvents is decomposed into bisulphuret of kakodyl and sul- 
hur. 
» The radical kakodyle is therefore capable of combining di- 
rectly with sulphur, forming two, if not three sulphurets, which 
are perfectly analogous to the three oxides, as is shown in the 
following table : — 
C* H® As? Radical. 
C1 H® As?. S_ Ist product of the action of sulphur. 
C1 H® As?. S? 2nd sid ay 
C2. HiS As? .).83 8d. se. Ss 
Bisulphuret of Kakodyle. 
This compound is best obtained by means of the protosul- 
phuret of kakodyle, which is formed by repeatedly distilling 
chloride of kakodyle with sulphuret of barium. 100 parts of 
the anhydrous sulphuret must be digested with 13-2 parts of 
dry sulphur until the whole is dissolved, and the white mass 
thus produced dissolved in ether; the crystals obtained from 
this solution are almost pure, they may be obtained quite so 
by adding a few drops of the protosulphuret and crystallizing 
from aqueous alcohol, 
These crystals are large rhombic tables unchangeable by 
exposure to the air, and possess a most powerful and pene- 
trating smell of assafcetida. Heated above 40° C., they fuse 
into a colourless liquid, which on cooling forms a radiated cry- 
