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

 Table X (continued). 



* Indicates a temporary reversal with the two contiguous metals, i.e., the one 

 marked and the one o6arc.it. 



f Indicates that a current occurred on contact only between the marked one and 

 the next above it. 



Remarks. The currents obtained from two contiguous base metals 

 were usually much stronger than those from contiguous noble 

 ones. The influence of rise of temperature in altering the relative 

 positions of the various metals in the series may be rendered more 

 evident by drawing cross lines between those which are altered. It 

 might have been supposed that as chemical action is usually increased 

 by heat, the hot piece of metal would in nearly every instance have 

 been either more electro-positive or less electro-negative than the cold 

 one, and that the orders of the chemico-electric series of metals with 

 each liquid at 160 would have been nearly always the same as at 

 60 F. The results exhibited by Table X, however, show that out 

 of 22 liquids, in two only, viz., dilute hydrochloric acid and solution 

 of potassic bromide, was the order of the hot series of metals exactly 

 the same as that of the cold one. In all these cases of voltaic as well 

 as of thermo-electric action, change of temperature was attended by 

 change of electric state. 



By tabulating separately, and comparing the numbers of in stances 

 in which the respective metals occur on the several lines of Tables I 

 and X, it will be at at once seen that in the thermo-electric series the 

 metals generally, whilst occupying the same parts of the table as those 



