DE. A. W. HOFMANN ON THE PHOSPHOEHS-BASES. 
427 
Angles. 
Calculated. 
Observed. 
10 0, 010 
0 
90 
1 
90 
t 
5 
1 0 0, 001 
= 
56 
49 
56 
49 
10 0, 110 
= 
27 
39 
27 
39 
1 0 0, T 0 1 
= 
114 
2 
114 
2 
010, 001 
= 
90 
90 
6 
010, 110 
= 
62 
21 
62 
21 
0 1 0, 1 0 1 
= 
90 
90 
0 01, 110 
= 
61 
60 
55 
0 01 , To 1 
= 
57 
13 
57 
13 
1 1 0, T 0 1 
= 
111 
9 
110 
55 
1 1 0, 1 1 0 
124 
41 
124 
42 
According to Nauma]S^n^ : 
a:b: c=0-9205 : 1 : 1-5970 ; «o^=y=56° 49'. 
Forms observed: — 
OO P OO, CO P OO, 0 P, CO P, P CO . 
According to Weiss: — 
a:b: c=l : 1-5970 : 0-9205; aoc=12^° 11'. 
Forms observed : — 
a : oob : oo c; oo a : b : oo c; oo a : oo b : c; a : b : oo c; — a : oo b : c. 
According to Levy : — 
MM=124°41'; M P=119°; 5 : A=1 : 0-4885. 
Forms observed : — 
A', g', P, M, a'. 
The faces are all bright, with the exception of 101, which is frequently dull, and 
which, on account of this difference of lustre, may be easily distinguished from 0 01. 
The faces 10 0 and 110 exhibit delicate strise parallel to the edge of intersection. 
3 L 2 
