342 Dr. G. Gore on Chemical 



(1) The absorption-spectra ot the three salts examined 

 undergo changes on diluting their solutions. 



(2) These changes are of such a nature that the spectra 

 tend to become identical in dilute solutions. 



(3) The results of other observers show on the whole that 

 salts of other metals behave in a similar way. 



(4) The behaviour of the salts examined leads to the con- 

 clusion that, in strong solutions, the acid and basic parts of 

 the salts are associated in producing absorption of light, 

 while in dilute solutions they act independently in doing so. 



(5) These results are in substantial agreement with the 

 hypothesis of electrolytic dissociation. 



(6) The results cannot be satisfactorily explained on the 

 hypothesis of ahydrolytic dissociation, or on that of molecular 

 aggregates. 



In conclusion, I take this opportunity of expressing my 

 thanks to Professor H. B. Dixon, at whose suggestion this 

 investigation was begun, and also to Professor A. Schuster for 

 the kindness with which he placed the Vierordt spectro- 

 photometer and other apparatus at my disposal, and for much 

 valuable advice in carrying out the work. 



XXXYI. On Chemical Equilibrium in Mixed Electrolytes. 

 By Dr. G. Gore, F.R.S.* 



IN various researches I have shown that any change occur- 

 ring in the molecular or chemical constitution of an 

 electrolyte may be easily and quickly detected, and its 

 amount and rate to a certain extent measured, either by the 

 voltaic balance method, or by the simple plan of immersing 

 a suitable voltaic pair of metals in the liquid successively at 

 different periods of time, and noting either the degree of 

 voltaic energy, electromotive force, or strength of current 

 produced ; and I have shown that in certain cases, the 

 mixture of electrolytes, especially that of an aqueous solution 

 of a halogen with one of a salt or base (and in some cases a 

 very dilute solution of an acid with one of a salt), the liquid 

 mixture does not at once attain its final or fixed state at 

 16° C, but attains it rapidly on the application of heat. (See 

 " Method of Examining Rate of Chemical Change in Aqueous 

 Solutions/' Proc. Roy. Soc. March 14, 1890, p. 440. " On 

 the Molecular Constitution of Isomeric Solutions," Phil. 

 Mag. Oct, 1889, p. 289. « Method of Measuring Loss of 

 Energy due to Chemical Union &c," Phil. Mag. Jan. 1892, 

 p. 28.) 



* Communicated by the Author. 



