526 Mr. Gr. H. Livens on the Electron Theory 



Summary and Conclusions. 



1. On the Bjerrum principle as extended by Eucken that 

 the frequencies of the infra-red bands exhibited by a compound 

 are given by the expression 



nh 



the basis constants of water, ammonia, benzene, and the 

 aliphatic hydrocarbons have been calculated. 



2. The abnormal intensity oi certain bands in the infra-red 

 spectrum of these substances has been shown to be due to 

 convergence-frequencies of two or more series 



nh nh 



3. The Bjerrum principle of combination of the central 

 frequency of an absorption-band system with those of the 

 infra-red bands has been applied to the ultra-violet band group 

 of benzene and the wave-lengths of the whole of the component 

 absorption lines calculated. The values agree very closely 

 with those observed. In addition to this, the conception 

 gives an explanation of the division of the main absorption- 

 band group into sub-groups. 



4. The infra-red spectrum of a compound is shown to be 

 an additive function of the spectra of its constituent radicles. 

 This is proved in the case of phenol, aniline, myricyl alcohol, 

 and triethylamine. 



5. The wave-lengths of the absorption lines composing the 

 ultra-violet band groups of phenol and aniline have been 

 calculated from the infra-red spectra of benzene and water, 

 benzene and ammonia respectively, by making use of the 

 basis constants of each. The agreement between calculated 

 and observed wave-lengths is again very good, and well 

 within the limits of experimental error. 



The University, Liverpool. 



LY. Ihe Electron Theory of the Hall Effect and Allied 

 Phenomena. By G. H. Livens *. 



1. Introduction, 



IN 1879 Hall found that the lines of flow of an electric 

 current through a metallic conductor are distorted when 

 the conductor is placed in a magnetic field, the distortion 

 being of the character of that produced by a slight additional 



* Communicated by the Author. 



