64 Mr Purvis, The influence of a strong magnetic field 
The following lines were divided into four constituents, and 
the differences in their general appearances are noted. The 
measurements were between corresponding constituents, and for 
several of them there appears to be a simple ratio between the 
values of dX/X 2 . 
X 
rfX/X 2 
3403-47 
+ 2-46 s 
+ T26p 
0 
-1-26jj 
- 2-46 s 
[The two outside constituents were weaker and more diffuse 
[ than the two inner ones. 
3382-82 
+ 2-43 s 
+ 0-82 jj 
0 
- 0-82 p 
- 2-43 s 
| do. 
3342-78 
+ 2-28 s 
+ 0-86p 
0 
- 0 - 86 p 
-2-28 s 
| do. 
3340-03 
+ 2-68 s 
+ 1-30 p 
0 
- 1-30 p 
-2-68 s 
| do. 
3209-3 
+ 2-20 s 
+ 0-77 p 
0 
-0-77 s 
-2-21 p 
\ The third constituent, counting from the less refrangible end, 
[ was stronger than the second, and the fourth was a little 
[ stronger than the first. The polarised condition of the four 
j constituents is abnormal. 
3136-81 
+ 1-30 s 
-1 1*16 p 
0 
-1-Up 
- 1-30 s 
[The two outside constituents were weaker and more diffuse 
[ than the two inner ones. 
2865-22 
+ 2-09 s 
+ 1-08 p 
0 
- 1-08 p 
- 2-09 s 
| do. 
2862-62 
+ 2-07 s 
+ 0-79 p 
0 
-0-79jt3 
- 2-07 s 
| do. 
1 
