'214: Dr. Meyer Wilderman : Connexion hetweenthe 



when light is passing through a system it creates new periodi- 

 cally oscillating movements of the atoms or molecules which 

 are similar to those of the a?ther waves of the light themselves 

 (this kind of new energy can well be called " light-kinetic 

 energy of the atoms or molecules "). Since the theoretical 

 investigations of the above regions of phenomena on the 

 basis of the above mechanical conceptions met no doubt with 

 great success, having found in the quintessence extensive 

 confirmation in the numerous experimental investigations 

 undertaken for their test, it is only expedient that in the con- 

 sideration of the subject from a thermodynamic or energetic 

 point of view the formed conceptions should be brought into 

 concord, if possible, with the conceptions of Stokes, Helm- 

 holtz, and others. The author has been trying to find a more 

 direct experimental decision upon this very fundamental 

 point, and he believes he has succeeded in the following 

 manner : — If the action of light consisted in tlie increase 

 in the chemical potential only, then the current generated under 

 the action of light should according to Gibbs equations, p. 503, 

 v"— r, 1 — a^fixd — n u ") and v" -v' = a g (fjL g " — ^f) always go IN 

 ONE direction. The author finds that the same metallic plates 

 give in different mediums, at one time a current from the plate 

 in the light to that in the dark, at another time in the opposite 

 direction, and also that different metallic plates give in the 

 same medium currents in opposite directions. 



Thus the author conceives that the new kinetic energy of 

 the atoms, stored in them under the influence of light, does 

 not transform into chemical energy alone, but into chemical 

 energy and into a light-kinetic energy sni geneiis at the 

 same time. In other words, the terms (\ l , dmi)...{K n , dm n r ) 

 must be decomposed into two parts Vidm/, v 2 dm 2 ' . . v n dm n ' 



(chemical energy), and X/rfm/, \JdmJ (kinetic energy mi 



generis for which we r 



kinetic energy/' A/, \ 2 ' •-*/ being the light-kinetic poten- 



veneris for which we may conveniently retain the term "light 



tials), which like gravitation is bound on the same components, 

 but is not identical with chemical energy. 



The equation for the system in the dark being 



dR = td V ~pdv + ^dm,. . . + g n dm n >0, . . (12) 



it thus transforms in light into another 



oTE^t'dn'-p'dv' + fii'dm^ + X/dm/. . . + nn'dmj + \ n 'dm n '^J), (A') 



where (#*/) +v, = /*/... (/*»') +*„=/*,/, &c, the values of 

 fi\ X' being a function of the intensity of light and its com- 

 position, of the nature of the components of the surrounding 

 medium. &c. 



