244 



DK. W. GEOFFREY DUFFIELD ON THE 



TABLE X. (continued). 



9. Relation between the Intensity of a Line and its Displacement. In Diagrams 9 

 and 10 the values of d/\ 3 for the two groups are plotted against the intensity of each 

 line at atmospheric pressure. There is a distinct upward drift of the black dots with 

 increasing intensity, which is made more apparent when the mean value for each 



