DE. A. W. HOFMANN ON THE PHOSPHOEHS-BASES. 
50U 
Angles. 
Calculated. 
Observed. 
10 0, 101 
= 19 22 
19 27 
010, 110 
= 30 10 
010, 101 
= 90 0 
— 
110, T 1 0 
= 60 20 
60 10 
110, 101 
= 61 42 
61 37 
101, Toi 
= 38 44 
38 54 
According to Naumann : — 
Forms observed : — 
According to Weiss : — 
= 2-8449: 1:0-5812. 
oo P oo, oo P oo, oo P, P oo. 
«: 5: ( 7 = 1:0-5812:2-8449. 
Forms observed : — 
a : CO h : oo c\ oo a: h '.oo c’. 
According to Levy : — 
MM = 119'’ 40'; 
Forms obsened : — 
a: h : COG', a: coh '. c. 
5:7( = 1: 2-4596. 
Fig. 67. 
Fig. 08, 
g\ h\ M, e'. 
Combinations observed : — 
10 0, 110, 101 (Fig. 67). 
10 0, 110, 101; 010 (Fig. 68). 
Cleavage 010 imperfect. 
The faces 101 are dull, the others brilliant. The crystals are optically negative. The 
medium line is perpendicular to 1 0 0, and the plane of the optical axes is parallel to 
0 01. The external angle of the optical axes appears to be about 60°. 
Hardness greater than that of gypsum.” 
Gold-salt . — The solution of the dichloride, which is obtained by treating the crystal- 
lized platinum-salt with hydrosulphuric acid, yields with trichloride of gold a golden- 
yellow precipitate consisting of fine needles, which are difficultly soluble in water. 
0-3845 grm. of gold-salt, precipitated by hydrosulphuric acid, &c., gave 0-1800 gnu. 
of gold. 
The formula 
Cg H22 P N Au 2 Clg = 
(C, HJ' 
(C2H,)gP-^"^, 
H. N 
CI 2 , 2 Au CL 
requires 
1 equiv. of Phosphammonium 
2 equivs. of Gold .... 
8 equivs. of Chlorine . 
1 equiv. of Gold-salt 
Theory. Experiment. 
163 
19-38 
394 
46-85 
46-81 
284 
33-77 
841 
100-00 
