£22 Prof. J. de Kowalski : Applications of the Theory 



and unreliable that no conclusions of value could be drawn 

 from them. 



23. The matter cannot be regarded as definitely settled ; 

 but after trying almost every experiment, reasonable or un- 

 reasonable, that I can devise, I think that little more light 

 can be thrown upon it by direct investigation. 



My best thanks are due to Prof. Thomson for the innu- 

 merable helpful suggestions with which he has favoured me. 



Summary. 



24. The saturation current through the gas in a vessel 

 which was alternately heated and cooled has been investigated. 

 It was found that the current increased during the initial 

 heating and decreased during the initial cooling. 



The circumstances which determine the magnitude of these 

 changes have been investigated. 



It is suggested that the changes may be due to the induction 

 of electrification on the electrode by very massive charged 

 particles carried about by convection currents. 



Cavendish Laboratory, 

 Feb. 190G. 



LII. Some Applications of the Theory of Electrons to the 

 Theory of Phosphorescence. By Joseph de Kowalski, 

 Dr.. phiL, Professor of Experimental Physics, University of 

 Friboiirg, Switzerland* . 



I. npHE experiments performed by various scientists such 

 _L as Wiedemann, Leonard, Nichols, and Merritt, and 

 others, demonstrate with increasing certitude that the difference 

 between phosphorescence and fluorescence is only apparent, 

 and rather of a quantitative than of a qualitative nature. 



In the presentation of the theory which follows, I have 

 tried to correlate these phenomena and to find an explanation 

 which accounts for them both on the same basis. 



I intend to present only the general ideas of the theory 

 and to indicate its utility in explaining the fundamental facts 

 in this domain. I will leave aside all details as I propose to 

 study them apart. 



I admit with Prof. J. J. Thomson that a system of corpuscules, 



* Communicated by the Author. 



This note is based on the ideas set forth by Prof. J. J. Thomson in 

 ' Nature/ March 22, 1906. A summary thereof has been presented in a 

 note to the Comptes Eendus de l'Academie des Sciences, Paris. 



