= = S Bacar, ot 
= in F. 
ep 
2 
r908-9.] CRYSTALLIZATIONS OF ERYTHRITE FROM COBALT. A47 
POLAR ELEMENTS py, q,, AND e. 
Po’, do, and e’ are the elements when h=1. With r,=1 we have 
h=sin » so if the elements p,’, q,’, and e’ be multiplied by sin » we 
have the: polar elements po, q,, and &, z.e., po=Po SiN 4, dg=qo Sinz, 
e=e’ sin », therefore the polar elements are: 
Po = 09-9339; q.=0.6766, e—On2 501. 
The axial lengths and the angle @ are obtained from the elements 
thus :— 
Glen do Jo , 
—— ag 5 C= = — §—= 180° — vp. 
Ie Vai hort sin» 10” aa i 
By substituting in these equations the values of the elements deter- 
mined we have a=0.75§02 and c=o0.7006 and the axial ratio for 
Erythrite becomes :-— 
Bae el eC. Ong SOD. 2 VEN OL 7000: 
