68 
Mr Purvis, The influence of a strong magnetic field 
X 
dX/X~ 
3361-92 
+ 2-08 
0 
-2-08 
3360-48 
+ 2-02 
0 
-2-03 
3357-52 
+ 1-75 
0 
-1-73 
3348-00 
+ 1*42 
0 
-1-39 
| The three constituents were diffuse. 
3335-52 
+ 1-53 
0 
-1-51 
J The three constituents were very diffuse. 
3328-50 
Too weak to measure. 
3324-52 
+ 1-70 
0 
_ ? 
+ ? 
(The most refrangible constituent of 3324-52 widened into the 
f least refrangible one of 3324-27. 
3324-27 
0 
-1-47 
J 
3312-35 
]_ The constituents widened and blurred into each other ; and it 
j was impossible to isolate them. 
J- Too weak to measure. 
3312-10 
3310-86 
3308-31 
3307-20 
+ 1-44 
0 
-1-40 
| The three constituents were very diffuse. 
3295-58 
+ 1-53 
0 
-1-56 
| The three constituents were very sharp. 
3270-28 
| 
3264-40 
j - Too weak and diffuse to measure. 
3258-88 
3238-90 
3234-20 
+ 1-46 
0 
-1-48 
+ 1-40 
0 
-1-37 
’ 
-The constituents were very diffuse. 
3217 51 
+ 0-90 
0 
-0-90 
| The middle constituent was removed by calcite. 
