48 



Mr Purvis, The radiation of various spectral 



The agreement between these numbers is moderately close; 

 the chief differences being the two outermost constituents of the 

 sextet from 6383 ; although the numbers obtained from both my 

 measurements are fairly comparable. Also, there is no very close 

 agreement between the numbers obtained from the triplet of 6163, 

 except that the numbers obtained from my own measurements 

 are comparable. 



Lohmann did not appear to observe if there were any shift of 

 the lines towards the red end of the spectrum when the neon was 

 vibrating in the magnetic field. It would be difficult to do this 

 with an echelon, for it would be necessary to move the photo- 

 graphic plate and there would be a consequent source of error. 

 But, with this object in view, some photographs were taken by 



