328 Mr Campbell, Discontinuities in Light Einission. 



source are certainly less than those of two : and, accordingly, the 

 main source of the fluctuations must lie in changes in the relative 

 intensities of the lamps. 



It is for this reason that the work that has been done appears 

 of sufficient promise to justify publication. If results are ulti- 

 mately obtained, the description of the methods and the narration 

 of the results would be so lengthy that it appears desirable to 

 divide thus the account into two parts. 



