56 
Mr Purvis, The influence of a strong magnetic field 
A 
d\/A 2 
3253-05 
+ 2-00 
0 
-2-07 
1 The most refrangible constituent was wider and more diffuse 
j than either the middle one or the least refrangible. 
3249-50 
+ 2-24 
0 
9 
^ The most refrangible constituent widened into the least re- 
j frangible one of 3248 - 8. 
3248-80 
+ 1-65 
0 
-1-63 
3242-13 
+ 0-55 
0 
-0-55 
| The middle constituent was removed by calcite. 
3239-83 
+ 1-77 
0 
-1-79 
3239-19 
+ 1-47 
0 
- 1-48 
3236-70 
+ 1-78 
0 
- 1-83 
| The three constituents were equally strong. 
3234-63 
+ 1-94 
0 
-1-91 
| do. 
3232-50 
+ 1-30 
0 
-1-31 
3231-48 
+ 1-87 
0 
-1-88 
| The constituents were very weak. 
3229-54 
+ 1-51 
0 
- 1-50 
3229-30 
The constituents widened into those of 3229-54 and were weak 
and diffuse. 
3228-76 
+ 1-20 
0 
-1-20 
3226-88 
Too weak to measure. 
3224-43 
+ 1-51 
0 
-1-51 
3223 00 
+ 2-22 
0 
- 2-23 
