12 



Prof. E. C. 0. Baly on 



sulphur dioxide, both of which molecules have three atomic 

 frequencies. Perhaps the most striking experimental con- 

 firmation is to be found in the fact that in any one sub-group 

 the subsidiary frequencies are formed from only those 

 atomic frequencies which have the intra- molecular fre- 

 quency as their convergence frequency. None of the 

 previous theories are able to account for this selective 

 association of the atomic frequencies. 



Fig. J 



Although the system of subsidiary frequencies is more 

 complex in such cases as the molecules of water and sulphur 

 dioxide, yet it manifestly is exactly analogous in detail to 



