420 



any longer to be connected directly with the degree of association 

 of liqnids? 



^ 3 The variations of — mnst in the first instance be dependent 



on the way, in which the specific heat c of a iiqnid, is connected 



with the magnitude >S of the bordering layer of it. In general we 



dc d''i 



shall have a reh-.tion : — =r— 7'—^, from which follows, that / can 



oS 01' 



only be a linear function of 7^ in the case, when c is f?Klependent 



of S. Fiom our measurements however we must (h)ubtlessly con- 



elude, that generally ;;^ — can not be supposed equal to zero, and 

 o7'* 



that therefore c mnst really be dependent upon S. This fact proves 

 at the same tiuie, that the specific heat of the surface-layer must 

 have another value than for the remainhu/ part of the liquid. The 

 surface-energy therefore cannot be completely of a potential nature, 

 but partially it must be considered as being of kinetic origin. In 

 what manner however it will vary with the state of proceeding 

 polymerisation or depolymerisation of the liquid, we cannot tell in 

 advance; and the same is the case ??i7fto/w 77iw^<2?2r/w with the depend- 

 ence of II upon t. 



At the same time it is not superfluous in this connection to fix 

 the attention upon the fact, that it cannot be {)ermitted to make 

 any detinitive statement^) concerning a high degree of association 



in the case of molten salts, because the observed values of — are 



of 



very small, and the /Ll-^curves seem to approach in these cases much 



better to the rectilinear type 2. For the whole theoretical exposition 



of EöTVös cannot be applied to cases like the present one, where 



nobody can know a priori, if the law of corresponding states will 



be valid. It is just the question, if the measurements still to be 



made will permit us to draw general conclusions upon an analogous 



connection between the temperature-coefficients of the molecular 



surface-energy and the degree of association of such electrolytes? 



Such conclusions could only be esteemed sufficiently justified, if 



certain analogies in the behaviour of molten salts and of the organic 



liquids should be found; at this moment we are still far distant from 



the time, when we shall be able to give any definitive judgment 



upon this matter. 



1) Vide e. g. the relating views of Walden, Bull, of the Academy of Petrograde 

 loco cit. 



