488 PROF. NICHOLSON AND DR. MERTON ON DISTRIBUTION OF INTENSITY, ETC. 
centre, the only general law consistent with the distribution of curvature is that of 
a sum of linear exponential terms, one for each component. 
(8) It is shown that under these circumstances discontinuities in the slope of the 
curves must occur. The discontinuities which have been found in the curve for 
H n are in quantitative accordance with those to be expected from the available data 
with respect to the electrical resolution. 
(9) Qualitative observation of TQ, H v and the diffuse series of helium and lithium 
confirms the view that electrical resolution is the principal cause of the phenomena. 
(10) A discussion of further applications of the method is given. 
