66 
Mr Parvis, The influence of a strong magnetic field 
The following lines were divided into triplets. The middle 
constituent was usually the strongest ; but there were exceptions 
to this. In some instances the three constituents were equally 
strong; and in others, the middle constituent was very little stronger 
than the other two. The constituents also varied in their relative 
diffuseness; some were sharp and clear, whilst others were very 
diffuse. Unless otherwise stated, the middle constituent vibrated 
parallel, and the two outside ones perpendicular, to the lines 
of force. 
\ 
rf\/\ 2 
4652*34 
The constituents were too weak to measure. 
4646*35 
+ 1-57 
0 
— 1'56 
1 There appeared to be a division of the middle constituent : hut 
J it was not very clear. 
4642-20 
4639-77 
4626-35 
-The constituents were too weak to measure. 
4588-42 
4558-90 
+ 1-54 
0 
-1-56 
4351-99 
+ 1-57 
0 
-1-59 
4344-73 
+ 1-48 
0 
-1-50 
4339-69 
+ 0-81 
0 
-0-81 
| Middle constituent removed by calcite. 
4337-78 
Too weak to measure. 
4289-92 
+ 2-26 
0 
-2-26 
| The middle constituent was very little stronger than the two 
1 outside ones ; and the latter were more diffuse on the outside 
) edges than on the inside edges. 
4274-99 
+ 2-80 
0 
-2-81 
[The middle constituent was very little stronger than the two 
I outside ones. 
4254-50 
3984-08 
+ 1-83 
0 
-1-83 
1 Middle constituent was removed by calcite ; the three con- 
[_ stituents widened into one another, and the outer edges of 
1 the two outside constituents were more diffuse than the inner 
j edges. 
Constituents too weak to measure. 
! 
