X. Proceedings. [November 2gth, 192 1.. 



The following gentleman wavS elected an Ordinary Member 

 of the Society : — 



Alan Sterling Parkes, B.A. (Cambridge), Post Graduate Student in 

 the Victoria University of Manchester. Parkfield, Werneth, Oldham. 



Ordinar3'' Meeting, November 29th, 1921. 

 Mr. T. A. Coward, M.Sc, F.Z.vS., F.E.S. {President), in the 



Chair. 

 A vote of thanks was passed to the donors of the books upon 

 the table. 



Mr. F. T. Peirce, B.Sc, Assoc.Inst.P., read a paper "entitled : 



*' Electromagnetic Valency and the Radiation 

 Hypothesis." 



A magnetic doublet, consisting of two electrons in small 

 orbits, ring or vortical electrons, furnishes a probable physical 

 basis for a radiation hypothesis of chemical reactivity. It had 

 been suggested by Dr. A. E. Oxley [Proc. Roy. Soc, A., 98, 

 264] as an explanation of magnetic phenomena, and accords 

 well with the chemistry of the elem.ents and stereo-chemistry. 



Its application to the phenomena of chemical dynamics 

 suggests the following results for non-electrolytes : — 



The bond can only be broken by radiation of definite 

 frequency v, the most intense impact only resulting in ionisa- 

 tion. It can only be formed by an increm.ent of molecular 

 kinetic energy, 7zv, both processes following the law 



-h.. N_l 

 k =^ se j^. Q- 



A criterion is provided for the observable effect of external 

 illumination. This should be large for unimolecular decompo- 

 sition or transformation, considerable or reversible reactions, 

 especially the effect due to the radiation exciting the endo- 

 thermic process, and inappreciable for irreversible combination. 

 In all cases, the corresponding- frequencies are selectively 

 absorbed or emitted. 



The energy change is double, corresponding to the attainment 

 of the critical unstable equilibrium and of the normal stable 

 state. The energy relation holds for the complete change in 

 intrinsic energy U, 



-U = nH(v-vi) per mol. 



The system is capable of accumulating absorbed radiant 

 energy up to a limit of one quantum per electron. It emits in 

 quanta, but absorbs and scatters continuously. 



The bond is intenselv rigid and local. 



