1908-9.] CRYSTALLIZATIONS OF ERYTHRITE FROM COBALT. 
449 
The Winkeltabellen for all the forms observed calculated from the 
elements obtained from Cobalt crystals is as follows :— 
a=0.7502 Lga=987517 
c =0.7006 Lgc=984547 
L= Lgh= 
180 — §=74 — 59|Lg sin »=998491|Lg cos » =941346 
ERYTHRITE. 
Lga,.=002978| Lgp, =997030 
Leb, =015442|L¢q,=983033 
Lge= 
Lg’ = 013990 
qo 
ag — ir o7T 
Po=9.9339 
bo =1.427 |q,=0.6766 
h=0.9658| e=o.2591 
z| | | Symbol. : 
Z| 4 |sch’dt |Miller. 
1| b | om] o10 | 00-00 | 90-00 | 00-00 | go-00 | 00-00 | go-00 o 
2| a | @0}| 100 | go-00]| go-00 | 90-00 | a0-00 | go-00 |} 00-00 ed 
3} m| e | 110 ! 54-05 | 90-00! go-00| go-00! 54-05 | 35-55! 1.3804 
4| X |e 5/3] 35° | 39-38 | 90-00} go-00 | go-00 | 39-38 | 50-22 | 0.8286 
5| w | -10 Tor 90-00 | 34-55 34-55 | 00-00 34-55 | 00-00 | 0.6983 
6| y |+40} 104 | go-00| 27-00} 27-00 | 00-00 | 27-00 | 00-00 | 0.5095 
7| v | -1 | 111 | 44-55 | 44-40] 34-55 | 35-00| 29-46 | 29-51 | 0.6983 
0.7006 
=tan 2 
i>.¢) 
20 
0.6983 
0.5095 
0.9887 
In conclusion I wish 
to thank Dr. T. L. Walker for the interest 
taken and the assistance given in this work. 
