698 
ME. P. G-EIESS ON A NEW SEEIES OE BODIES IN 
Theory. 
Experiment. 
e 6 
72 ‘ 
16*98 
17*11 
H 4 
4 
0*94 
1*08 
n 2 
28 
6*60 

Bi-4 
320 
75*48 
76*06 
424 
100*00 
Platinum-salt of the Hydrochlorate of Diazobromobenzol, 0 6 H 3 BrN 2 , HC1, PtCl 2 . 
Bichloride of platinum, even from a very dilute solution of the nitrate or sulphate 
of diazobromobenzol, separates a mass of small yellow crystals, which appear under the 
microscope as fractured plates, and which are almost insoluble- in every neutral solvent. 
They are stable at 100° C. 
0*568 grm. gave, on ignition with carbonate of sodium, 0*1447 grm. of platinum. 
€ 6 H 3 BrN 2 , HC1, PtCl 2 . 
Calculated. Pound. 
Platinum . . 25*36 per cent. 25*47 
Gold-salt of the Hydrochlorate of Diazobromobenzol , C 6 H 3 Br N 2 , HC1, Au Cl 3 . 
This compound is precipitated from an aqueous solution of nitrate of diazobromo- 
benzol on the addition of terchloride of gold, at first as a yellow oil, which, however, 
rapidly solidifies to a crystalline mass. The crystals are insoluble in water, but can be 
recrystallized from warm alcohol without much loss, and are thus obtained in the form 
of splendid small golden-yellow shining plates. 
0*469 grm. of substance, dissolved in alcohol and decomposed with sulphuretted 
hydrogen, gave, after ignition of the tersulphide of gold, 0*1763 grm. of gold. 
G 6 H 3 BrN 2 , HC1, Au Cl 3 . 
Calculated. Pound. 
Gold . . . 37*67 per cent. 37*59 
Compound of Hydrate of Potassium with Diazobromobenzol , € 6 H 3 BrN 2 , KHG. 
On the addition of caustic potash to a concentrated solution of nitrate of diazobromo- 
benzol a lemon-yellowish precipitate of diazobromobenzol separates at first, but is soluble 
in excess of potash. On evaporation by means of a water-bath, the solution solidifies, 
when sufficiently concentrated, to a reddish-coloured crystalline paste of nitre and the 
new compound of hydrate of potassium and diazo-bromobenzol. 
The latter is separated and purified exactly in a similar manner to the analogous 
compound of diazobenzol. It differs from this compound in being precipitated from its 
alcoholic solution by means of ether as a white gelatinous mass, and not in the form of 
crystals. White plates are obtained by allowing its aqueous solution to evaporate on a 
