460 
DE. A. W. HOFMAXN" OX THE PHOSPHOErS-BASES. 
Combinations observed : — 
1 LO, Oil, 100; 101, 101 (Figs. 32, 33). 
110, oil; 10 0, Til, TOl (Fig. 34 ). 
110, Oil; 10 0, Til, 101, 211 (Fig. 35). 
110 , Til; 10 0 , To 1 , oil. Ill (Fig. 36). 
110, Oil; 10 0, 111; 101, Til, 211 (Fig. 37). 
110, Oil, 100; 010, Oil, To 1, 211 (Figs. 38, 39). 
Fig. 35. Fig. 3(3. 
The faces Oil are often very unequally developed, as seen in Figs. 32 and 33, and iu 
Figs. 38 and 39 ; under these circumstances some of the faces of the forms 111, 111, 
211 are apt to disappear, as may be seen in Figs. 38 and 39. 
Cleavages : 10 0, 110. Lustre : \itreous. 
Colour : orange Avith a tint of yellow in minute, and of red in larger, crystals. 
The plane of the optical axes is parallel to the axis of symmetry [0 1 0], for rings 
are observed across the faces of the prism 110, the centres of which are disposed sym- 
metrically with regard to [01 0]. The principal medium -line is perpendicular to 
[ 010 ].” 
Gold-salt . — Light yellow needles, dithcultly soluble in cold Avater, recrystallizable from 
boiling water. 
0’2394 grin, of gold-salt left on ignition 0'0841 grin, of gold. 
