730 
ME. P. GEIESS ON A NEW SEEIES OE BODIES IN 
Calculated. 
A 
Pound. 
( 
«12 
144 
9-57 
9-03 
h 6 
6 
0-40 
0-82 
96 
6-38 
— 
Pb 10 
1035 
68-77 
68-59 
©14 
224 
14-88 
— — 
1505 
100-00 
Trisulphodiphenylenic Acid 
is obtained in a free state in exactly the same manner as tetrasulphodiphenylenic acid, 
which it resembles in every other respect. It is evident at a glance that its composition 
may also be expressed in two different ways, viz. C 12 H 6 , S 3 H 4 0 n , or C 12 H 6 , S 3 H 6 0 12 . 
In accordance with the experiment just described, the decomposition which the tetrazo- 
diphenyl undergoes by the action of sulphuric acid may be expressed by the following 
equations : — 
I- «12 H 6 N 4 +S 4 H 8 G 16 =€ 12 H 6 S 4 H 8 0„+N 4 . 
'■ -V ' V “V 
Tetrazo diphenyl. Tetrasulphodiphenylenic 
acid. 
II. € 12 H 6 N 4 +S 8 H 6 Q 12 = G 12 H 6 , fi 3 H 6 P 12 +N 4 . 
Tetrazodiphenyl. Trisulphodiphenylenic acid. 
Decomposition of the Platinum-salt of Tetrazodiphenyl and of the Pevbromide. 
On mixing the platinum-salt of tetrazodiphenyl with from four to six times its weight 
of carbonate of sodium, and heating the mixture in a retort, a copious evolution of gas 
speedily ensues ; and on increasing the heat an oily body distils, which solidifies in the 
neck of the retort to a white mass. By pressing this body between bibulous paper, and 
by repeated recrystallization from boiling alcohol, it is obtained perfectly pure. Analogy 
leads to the supposition that the formation of this body takes place according to the 
equation 
€ 12 H 6 N 4 , 2HC1, 2PtCl 2 =€ 12 H 8 Cl 2 + Cl 4 + Pt 2 +N 4 . 
v V J V V 
Platinum-salt. New body. 
The following chlorine-determination corroborates this transformation : — 
0-235 grm. gave 0-2938 grm. of chloride of silver = 30-93 per cent, of chlorine. 
Calculated. Pound. 
Chlorine = 31-84 per cent. 30-93. 
This new body, which I will call dichlorodiphenyl, crystallizes in white, usually well- 
formed prisms ; it is difficult of solution even in boiling alcohol, but readily soluble in 
