106 ON THE HEAT EVOLVED, &c. 
7th. Pouillet having deduced from his experi- 
ments (repeated with great caution by Becquerel) 
the general conclusion that, during combustion, 
oxygen disengages positive, and the combustible, 
negative electricity ; and Faraday having proved 
that a constant quantity of electricity is associa- 
ted with the combining proportions of all bodies ; 
it only remained to prove that the intensity of the 
electricity passing from the oxygen to the com- 
bustible at the moment of their union is just that 
which is equivalent to the actual heat of combi- 
nation. This I have attempted, and in so doing 
have met, I think it will be admitted, with such 
success, as to put the beautiful electrical theory 
of chemical heat, first suggested by Davy and 
Berzelius, beyond all question. I have shown 
also that the modus operandi is resistance to con- 
duction. 
