50 
Mr Purvis, The influence of a strong magnetic field 
X 
dX/X 2 
4054-00 
+ 1-22 
0 
- 1-25 
4028-50 
+ 1-44 
0 
-1-46 
4025-32 
+ 2-26 
0 
? 
) The most refrangible constituent widened into the least re- 
| frangible of 4024-80. 
4024-80 
+ ? 
0 
-2-01 
| The least refrangible constituent widened into 4025-32. 
4009-10 
Too diffuse and too weak. 
3998-83 
+ 1-79 
0 
-1-80 
3989-97 
+ 1-49 
0 
-1-48 
3964-40 
1 do. 
) 
3963-00 
3958-37 
+ 1-56 
0 
-1-58 
3956-49 
+ 1-25 
0 
-1-25 
| The middle constituent was removed by calcite. 
3948-84 
+ 1-25 
0 
- 1-25 
| do. 
3947-90 
1 Too weak and too diffuse. 
3932-20 
3913-69 
+ 1-26 
0 
-1-25 
3904-98 
+ 1-39 
0 
-1-40 
3900-72 
+ 1-49 
0 
- 1-47 
3883-00 
3882-42 

The constituents widened and blurred into one another. 
