THE ELECTROLYSIS OF WATER. 97 
are subtracted from the compound resistances of 
column 5. 
According to these principles, all the numbers 
in column 11 should be equal; and.indeed they 
do not differ from each other more than might 
have been anticipated from such complicated ex- 
periments. An error of only the fourth part of a 
degree in column 7 is sufficient to produce the 
greatest deviation from the mean in column 11: 
and the results are likewise dependant upon the 
accuracy with which the resistance of the battery 
is ascertained. 
1-35, the mean of column 11, will very nearly 
represent the intensity required for the separation 
of the elements of water, and the assumption by 
them of the gaseous state. By these means heat 
becomes /atent, and a reaction on the intensity of 
the battery takes place, without the evolution of 
free heat. It is most interesting to inquire what 
part of the whole intensity is due to each action. 
I have endeavoured to ascertain it in the follow- 
ing manner. 
I removed the thick copper wire of the galva- 
nometer, and substituted for it a coil of a foot 
