1 82 ADDENDUM. 



less to attempt to predict their behavior in the remote infra-red. On the 

 whole, the present data indicate that the greater the wave-length of the 

 maximum the greater the shift of that maximum with increase in atomic 

 weight of the base. 



The latest conclusion (Morse, Phys. Rev. 26, p. 526, 1908) is that 

 " present data do not form any reasonable basis for assuming that all the 

 reflection bands in even the simpler oxygen acids are connected with each 

 other by such a simple relation as that found to hold roughly for the first 

 bands, and which may be found to hold also for the second bands in the 

 salts examined." 



