DE. A. W. HOFMANN ON THE PHOSPHOEUS-BASES. 
433 
The above fonnula is fully corroborated by the analysis of several well-defined salts, 
which will be mentioned presently. 
The yellow crystals are insoluble in water. Alcohol, both cold and hot, dissolves 
them in almost every proportion. The best crystals were obtained by the spontaneous 
evaporation of the ethereal solution in a high open cylinder. Some of these crystals 
were so well developed, that Quintino Sella was enabled to submit them to a detailed 
crystallographic examination, which I here insert. 
“ System monoclinic : — 
10 0, 0 0 l = 6r 2'; 0 1 0, 1 1 0=44° 27'. 
Forms observed: — 
10 0,010,001,110 (Fig. 18). 
Combinations observ^ed : — 
110, 0 01 (Fig. 19). 
110, 10 0, 001 (Fig. 20). 
110, 001; 10 0, 010 (Fig. 21). 
Angles. 
Calculated. 
Observed. 
10 0, 010 
= 
o 
90 
0 
0 t 
90 0 
1 0 0, 0 01 
= 
61 
2 
60 53 
10 0, 110 
= 
45 
33 
45 33 
010 , 0 01 
= 
90 
0 
010 , 110 
= 
44 
27 
44 27 
0 01 , 110 
= 
70 
10 
70 24 
110 , Tio 
88 
54 
88 54 
alcoholic solution with nitrate of silver not more than about one-half of the sulphur was separated as 
sulphide of silver. 0’3180 grm. of substance gave 0’1491 grm, of sulphide of silver=6’05 per cent, of 
sulphur. In the presence of ammonia the whole amount of sulphur is precipitated as sulphide of silver. 
MDCCCLX. 3 M 
