96 ON THE HEAT EVOLVED DURING 
that due to chemical changes, be unaccounted for 
elsewhere, it will prove the annihilation of part 
of the power of the circuit, without any corres- 
ponding effect. We shall see that this is not the 
case, but that in the evolution of heat where the 
excess of resistance takes place, an exact equiva- 
lent is restored. 
For, by inspecting column 9, we see that the 
excess of heat is greatest when the resistance to 
electrolysis is greatest ; and least also when the 
latter is least. Now, when this excess of heat is, 
in the manner I have before described, turned 
into the resistance to electrolysis of which it is 
an equivalent, and then subtracted from the com- 
pound resistance of column 5, we obtain the 
numbers of column 11, which represent the re- 
sistance due to the separation of water into its 
gaseous elements alone, and apart not only from 
the resistance owing to the state of the electrodes, 
but also from that which is due to the transfer of 
the fraction of an equivalent of acid or alkali ;— 
for since these are re-mingled with the liquid as 
fast as they are determined to their respective 
poles, and the heat evolved by this re-mingling 
appears in column 7, the equivalents of resistance 
due to the transfers appear in column 10, and 
