688 
ME. P. GEIESS ON A NEW SEEIES OE BODIES IN 
quantity of the hydrochlorate of a base which is no other than aniline. The occurrence 
of these bodies shows that a small portion of the diazobenzol is decomposed as follows : — 
G 6 H 4 N 2 + 3SH 2 =€ 6 H 7 N+NH 3 + 3£. 
The same products of decomposition are met with when an alcoholic solution of the 
gold-salt is treated with sulphuretted hydrogen. 
On passing the latter, however, over the dry gold-compound, it speedily causes an 
explosion. By employing only a very small quantity of the substance, and by spreading 
it in a thin layer in a glass tube, it is possible to avoid explosion and secure a quiet 
decomposition. The reaction is over when no more hydrochloric acid fumes escape 
with the current of sulphuretted hydrogen. The black residue which is left behind in 
the glass tube appears to contain, besides tersulphide of gold, free diazobenzol. I was 
not able to isolate this latter. The explosive nature of the residue and its deportment 
with ether, which speedily produces a rapid evolution of gas, leave, however, little doubt 
of its presence. Hydrochloric acid, tersulphide of gold, and diazobenzol are therefore 
the products of decomposition of the gold-salt by means of sulphuretted hydrogen. 
Action of Nascent Hydrogen upon Liazobenzolimide. . 
If hydrogen is generated by means of zinc and sulphuric acid in an alcoholic solution 
of this body, a point is reached in a comparatively short time when, on the addition of 
water, no more turbidity occurs, indicating that the diazobenzolimide has completely 
disappeared. 
By removing the excess of zinc and evaporating the alcohol on a water-bath, the 
residue, when treated with potassa, evolves much ammonia, and an oily base simultane- 
ously separates ; this is purified by distillation, and is found identical with ordinary 
aniline. The decomposition may be thus expressed : — 
G 6 H 5 N 3 +8H=C 6 H 7 N+2NH 3 . 
Diazobenzolimide. Aniline. 
Action of Carbonate of Barium upon Nitrate of Biazobenzol. 
By treating a cold aqueous solution of this salt with levigated carbonate of barium, a 
feeble evolution of gas is observed, which lasts for several days. A reddish-brown mass 
is produced insoluble in water, which remains with the excess of carbonate of barium 
when the reaction is over. The residue is a mixture of two distinct bodies. By filtering 
off the solution containing nitrate of barium and removing the excess of carbonate by 
means of dilute hydrochloric acid, these two products can be readily separated by 
treatment with cold alcohol, in which they are very unequally soluble. In order to 
obtain the more soluble one in a pure state, the alcohol is evaporated and the residue 
treated with ammonia. An intensely yellow-coloured solution is produced, which must 
be filtered to remove a small quantity of a resinous substance, and decomposed with 
hydrochloric acid, when the new compound is precipitated in crystals. These are 
obtained perfectly pure for analysis by repeated crystallization from weak alcohol. 
