480 Wells, Wheeler and Penjield — Rubidium and 



a table of measured and calculated angles, but in all cases, 

 where a series of accurate measurements were obtained, they 

 agreed closely with the calculated. 



JRbl. I 2 . The forms b, c, m, d, f, e and p were observed. 

 Of these/" and p were always small and frequently wanting. 

 The habit is shown in fig. 1. 



RbBr . Br I. The forms of «, c, m, d and e were observed. 

 The habit is shown in fig. 2. 



Eh CI . Br I. The forms «, d and e were observed. The 

 pinacoid a is usually wanting and the simple habit shown in 

 fig. 3, prevails. 



Mb 01. ClI. The forms «, d and e were observed. The 

 habit is shown in fig. 4. 



RbBr . Bi\. The forms a, b, m, d and f were observed. 

 The habit is shown in fig. 5. 



RbCl . Bi\. The forms b, c, m, d and e were observed. The 

 habit is shown in fig. 6. The tendency of this salt is to crystal- 

 lize in small scales : it is also the most unstable of the rubidium 



series, so that we considered it fortunate that we were able to 

 make out the axial ratio. The only faces which yielded good 

 reflections were b and d, which established accurately the rela- 

 tion between the b and c axes, while only approximate measure- 

 ments were obtained from the other faces. 



Kb CI . ClBr. The forms a, b, m, d and « were observed. 

 The habit is like fig. 2, except that c is wanting. 



