302 
Transactions of the Boyal Society of SoutJi Africa. 
In the foregoing work attention was confined to observation of faces 
on the upper half of the crystal in each case. 
All four upper faces of (111) were observed' 
(101) 
(5.5.11) 
Only two upper faces of (331) 
(1.1.14) 
(117) 
On each of the four 
crystals examined. 
The crystal on which (021) was recognized showed only two faces of the 
form. 
The precise position of each face seen on all four crystals is indicated 
on the accompanying stereographic projection. 
It will be observed that the distribution of these faces suggests a 
