44 
Mr Purvis, The influence of a strong magnetic field 
The following lines were divided into four constituents. They 
had not all the same appearance ; several of them had the con- 
stituents equally sharp and strong, whilst of others the two outside 
constituents were weaker and more diffuse than the two inside ones. 
X 
dX/X 2 
4314-98 
+ 2-14 s 
+ 0-76^ 
0 
-0-76^ 
-2-14 s 
1 The two outside constituents were weaker and more diffuse 
[ than the inside ones. Compare also 3072-17. 
4302-18 
+ 1-81 s 
+ 0-90p 
0 
--O-'JOjU 
9 
] The outside constituents were very weak and the most re- 
I frangible one widened into the triplet from 4301-30. The 
| least refrangible was clear and distinct, but weak. The 
I values of dX/X 2 are simple multiples of each other. 
3388-00 
+ 2-40 s 
+ 1-10 jj 
0 
- 1-10 2? 
- 2-40 s 
( The two outside constituents were weaker and more diffuse 
j than the two inside ones. Also compare 3152-42. 
3380-40 
+ 2-27 s 
+ 1-19 y 
0 
-l-19j> 
-2-27 s 
1 The two outside constituents were weaker and more diffuse 
[ than the two inside ones. 
3321-85 
+ 2-68 s 
+ 0-58 p 
0 
- 0-58 p 
-2-68 s 
|_ The four constituents appeared to be equally sharp. 
3315-47 
+ 2-24 s 
+ 0-42^ 
0 
- 0-42 2) 
- 2-22 s 
1 The constituents appeared to be equally sharp and strong. There 
7 seems to be a simple numerical relationship between them. 
3278-42 
+ 2-67 s 
+ 1-212) 
0 
- 1-21 2) 
-2-67 s 
1 The two outside constituents were weaker and more diffuse 
7 than the two inside ones. 
3272-23 
+ 2-66 s 
+ 0-982) 
0 
-0-982) 
? s 
The most refrangible constituent widened into the quadruplet 
V from 3271-80. The two middle constituents were strong and 
f sharp. 
3271-80 
? s 
+ 0-782) 
0 
- 0-782) 
- 2-33 s 
The least refrangible constituent widened into 3272-23 ; the two 
l middle ones were not so strong as those of 3272-23. The 
[ constituents appeared to be simple multiples of each other. 
