420 
DE. A. W. HOEMAJO ON THE PHOSPHOEUS-BASES. 
Angles. 
111, 111 
111 , 112 
111 , 112 
112 , 112 
Calculated. 
67 42 
17 44 
73 43 
84 11 
According to Naumann : — 
a\h\ ci=l-5776 : 1 : 0,6308 ; y=73° 42'. 
Forms observed: — 
oo P oo, OP, oo P, P oo, P, ^P. 
According to Weiss : — 
a: J:c=l: 0-6308: 1-5776; aoc=10Q° 28'. 
Forms observed: — 
aioobiooc; ooa:oob:c; a'.bicoc; — a:cob:c; — a:b:c; — a:b ^c. 
According to Levy : — 
MM=66° 38'; MP=98° 52'; 
5 :A=1: 1-3343. 
Forms observed: — 
A', P, M, a', b\ V. 
Combinations observed : — 
001, 10 0, 110 (Fig. 11). 
0 01, 110, 112, lOl. 
001, 110, 112, lOl, 10 0, Til (Fig. 12). 
Eig. 11. Eig. 12. 
Cleavages 101 and 110 distinct and easily obtained. 
Colour orange-red. 
The optical axes are situated in 0 1 0, i. e. in the plane of symmetry. They are seen 
through the faces 0 01 and the cleavages I 0 1, and they make an apparent angle of 
about 64°.” 
On mixing a concentrated solution of the oxide of triethylphosphine with trichloride 
