430 Mr. H. F. Biggs on Energy of Secondary Beta Rays 



appropriate K only, and hence the agreement between 

 observation and calculation is eminently satisfactory *. 



It would seem possible that with suitable modifications 

 the formula 



/ = l- e -« Y 



might find a more general application to solution phenomena, 

 for in such cases as the dissociation of strong electrolytes 

 the mass-action law again does not hold. In its present 

 form the expression only de;ds with the simplest case of one 

 molecular entity changing into another molecular entity. 

 If, for example, the solvent convert one molecule into two 

 entities, e.g. ions, then the effective concentration of the new 

 entities will be proportional to v'V, and we shall have 

 /•=l-g-«Vv 



If for /be put \/X , where X and X are the molecular con- 

 ductivities of a solution of concentration V and at infinite 

 dilution respectively, then 



This formula is found to express the molecular conductivities 

 of w T eak electrolytes with absolute accuracy at concentrations 

 smaller than V = 4, and of strong electrolytes also over a 

 fair range of concentration. A discussion of this cannot be 

 given here, but the matter is mentioned in order to show 

 that the formula may find considerable application to solution 

 phenomena. 



The University, Liverpool. 



LI. On the Energy of the Secondary Beta Rays produced 

 by Partly -absorbed Gamma Rays. By H. F. Biggs, B.A., 

 Assistant Lecturer in Mathematics in the University of 

 Manchester f. 



Object and Results of the Experiment. 



RUTHERFORD % has brought forward strong evidence 

 to show that the /3 particles wliich give the lines of the 

 magnetic spectrum of the /8 radiation from RaB and RaC 

 carry energy in whole multiples of the quanta corresponding 



* We are indebted to Mr. James Rice of this University for sug- 

 gesting- this formula to us, and take this opportunity of expressing our 

 •cordial thanks to him for the interest he has taken in this investigation. 



t Communicated by Sir E. Rutherford, F.R.S. 



% Rutherford, Phil. Mag. xxviii. p. 305 (1914). 



