84 Mr Purvis, The influence of a strong magnetic field, etc. 
stronger than the two outside ones, and several seem to be of 
equal intensities ; in others the two outside ones are sharper 
and stronger than the middle one ; and in others the three con- 
stituents are very diffuse. The differences are described in the 
preceding notes. 
(5) The strongest lines are not those which are most widely 
separated ; as a rule, the weaker ones have much higher values 
of dX than the stronger ones. This applies generally to all the 
elements so far examined. 
(5) With regard to manganese, there are several lines amongst 
the triplets which may be compared and correlated, in that the 
constituents have the same values of d\j\ 2 and similar appearance 
and polarisation. There are several lines divided into four, and the 
constituents of the quadruplet from 347 3’9 are simple multiples 
of one another. 
Generally, one of the outstanding facts of these investigations, 
and of those described in the previous papers, is that there are 
lines which divide into various constituents whose appearance is 
essentially the same, not only in their intensities, or diffuseness 
or sharpness, but also in the polarisation and the corresponding 
values of dX/X 2 . It is an obvious speculation to suggest that, on 
the theory of the corpuscular structure of the atom, they represent 
the vibrations of similar groups of corpuscles. 
The results of other elements will be published later. 
I have to thank Professor Liveing for the use of his spectro- 
scope, and Professor Larmor for his helpful interest in the work. 
