Mr Campbell, Discontinuities, in Light Emission. 525 



values are abnormal, and that the theory of the measurements 

 may be held to be established for the larger resistances. 



10. If the theory of the measurements examined in §§ 8, 9 

 is accepted, the observations lead to an estimate of the average 

 number of electrons liberated by a single light impulse. The 

 number obtained is 3'1. This result agrees well with that which 

 has been deduced on other grounds, and also with that to be ex- 

 pected from Planck's theory of radiation, if the bundle of energy 

 theory is correct. 



