2(50 



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



Table IV (continued). 



* Indicates a gradual reversal with one metal only. 



t Indicates that a temporary reversal occurred when the currents from the two 

 contiguous metals (i.e., the one marked and the one above it) were opposed. A 

 few reversals also took place with non-contiguous metals. 



Remarks. This table contains 23'42 per cent., or a proportion of 1 

 to 3'27, of instances of metals thermo-electro-negative in liquids. A 

 comparison of it with Table I shows that a large increase of strength 

 of liquid increased the number of instances of metals thermo-positive 

 in liquids from 199 to 219, or from 69'58 to 76'58 per cent., thereby 

 further showing the influence of the liquid upon the apparent thermo- 

 electric character of the metal, and indicating that increased con- 

 centration of the solution was usually accompanied; either by an 

 increase of thermo-electro-negative, or decrease of thermo-electro- 

 positive property of the liquid ; or that the metals, under the new 

 condition, were more electro-positive. No thermo-electric reversals 

 occurred during the experiments for making Tables I and IV, because 

 the metals were not gradually heated. 



Increased strength of liquid also greatly altered the order of the 

 series in every case, and produced a very large number of reversals of 

 position or of relative electro-motive force of the metals ; out of the 

 total 286 instances, 36 only were not reversed. With some particular 

 strength of liquid, therefore, intermediate between those employed in 

 forming the two tables, the currents from each two metals, which were 

 reversed in position, must balance each other. Many reversals of 



