190 MR. E. C. C. BALY ON THE SPECTRA OF NEON, KRYPTON AND XENON. 
give in their tables of the krypton and xenon spectra a few lines which do not appear 
on any of iny plates, and which therefore it is probable do not belong to these 
spectra. Liveing and Dewar’s list of the wave-lengths of the lines in the spectra 
of the most volatile constituents of the atmosphere contains 162 lines, which, as far 
as I can judge, do not belong to neon. The neon used for this work was undoubtedly 
perfectly pure, and as the lines measured both by Ltveing and Dewar and by myself 
are generally very much brighter on my plates, and as further I have observed a 
number of lines not observed by Liveing and Dewar, the only conclusion to be 
drawn is that the outstanding lines in the latter case are not due to neon. 
