192 W. A. Norton—Theories of Heat. 
same values in the inverse order, and in an equal interval of 
time. o heat, or other form of energy, can then be evolved. 
But if the bodies be imperfectly elastic the approximation of 
the molecules, and also of their atoms, during the interval of 
condensation, will be attended with an increase in the intensi- 
tion ecreasing resistance ; but the greater portion 18 
employed in effecting the atomic change just mentioned, which 
* This Journal, June, 1872, pp. 443 and 444. 
+ This Journal, May, 1872, p. 336. 
