•224, 



Dr. Clever Wildermaii: Connexion between the 



potentials, i. e.. the greater the increase of the intensity of 

 light, etc.. the more the equilibrium will be shifted from the 

 left to the right : more AgCl will be decomposed. In the 

 ease of H 2 + C1 2 =2HC1 and CO + OL = OOC1 2 , since the 

 reaction of decomposition of COCL and of HC1 in light is 

 in any case infinitely small, this will show itself in an 

 increase of the velocity of combination of CO and CL or of 

 Ho, CL, as is actually the case. What is the more precise 

 connexion between the constant of equilibrium and the 

 intensity of light ? This is a problem which will require 

 long, patient, and most difficult experimental investigation. 

 The author is now endeavouring to approach step by step the 

 solution of this problem. Starting first with the study of 

 one of the simplest cases of equilibrium, namely, with the 

 effect of the intensity of light upon metallic plates of the 

 same kind, mentioned above, the author, being in possession 

 of a constant powerful source of light, was able to establish 

 the fact that the electromotive force, which i/i the same manner 

 as the constant of equilibrium aires the maximum icork, is 

 directly proportional in this case to the intensity of light. A 

 more exact investigation of the results obtained and on a 

 larger experimental basis is, however, needed, may to some 

 -mall extent modify this conclusion, and will be communicated 

 in due time. 



Returning to the equation (O), we further get that if 

 no work is done by or against the svstem during the reaction. 

 I. e.. at a constant volume (n 2 + n 1 — n d )B.t / = 0, and the total 

 heat-energy of the given gas can be put (approximately at 

 any rate) =C 8 t\ where C., is the specific heat of the given 

 gas in light at a constant volume, and we get, after con- 

 tracting the constant-, instead of equation (O), 





p. 



lg'-£). • (P 



which, differentiated with respect to t\ gives 

 r /'»»i'\ Bl rm^Yn 



IT 



j 



r , a K,"-,i 1 K l // -i»,K a /ir ) + (n\Cj -f 7> 2 C 2 + m,C 



Rf' 2 



A + Br 

 Tit" 2 > 



