2G4 Dr. G. Gore. Relations of Heat to Voltaic and 



thermo-electric potential was decreased by increased strength of 

 liquid, there were only three in which it was increased,* and both the 

 total and average amount of decrease was greater than that of 

 increase. 



The determinations in Table VII of the thermo-electric potentials of 

 metals in liquids, the pieces of metal being at 60 and 160 F. respec- 

 tively, illustrate more fully the influence of strength of liquid. 



Remarks. In fifteen cases the thermo-electric potential was de- 

 creased, and in eight increased by additional strength of liquid, and 

 the total amount of decrease was greater than that of increase. As 

 greater strength of solution was usually attended by decreased 

 thermo-electric potential, it would be interesting to ascertain whether 

 this was related in any degree to the diminished specific heat of the 

 liquid, or to changes of diffusive power of its constituents. 



The following additional determinations of thermo-electric potential 

 by the method of balance were also made with electrodes at 60 and 

 160 F. respectively. 



Table VIIL Thermo-electric Potentials. 



* This = -00034 volt for 1 C. Bouty obtained '0007 of one Daniell's element. 

 (" Compt. Rend.," vol. xc, p. 917.) 



No difference of potential was observable on opposing the carrent 

 from two thermo-electric couples of tin in solution of potassic cyanide, 

 one being composed of large electrodes and the other of small ones. 

 By opposing those from the same metal and liquid, the one couple 

 having a large hot electrode and a small cold one, and the other the 

 reverse, no definite result occurred. 



Very few researches haVe been made on the thermo-electric pro- 

 perties of liquids. H. Wild (" PoggendorfTs Annalen,'' vol. ciii, 

 pp. 353 411, 1858) has shown that when two vertical columns of 



* This is a usual circumstance. 



