W. A. Norton—Theories of Heat. 195° 
; gers ie Rae 2¥ 
Ve=p-T V'=p'T’, and T—-T’=—,; isp 
feet Bee foe, ke gs 
=? Yop! * Top = op 
A: eee nA 5 een 1 2 
On DT’ <4 = Br =(t teas (477,500)?. 
Thus, T—T’=(¢— t’)477,500=477,500 x 0s-000004=15-91. 
Accordingly, if the velocity of vibration of the atoms, pro- 
duced by the electric spark, is reduced by ;', in 4 millionths of 
& second, the same atoms moving with the velocity of the eart 
in om > ae should lose ;', of their velocity in two seconds. 
o 
7° 
We have, therefore, 
ether takes effect upon the molecules of this mass, instead of 
their constituent atoms ; and still more if the flow of the ether: 
through the interstices of the mass be conceived to be wholly 
hor that it intercepts the impulses that take effect upon the 
ether which nH, its interstices, by reason of the earth’s 
of these bodies are sensibly resisted in their motions by the 
ether of space. 
It may perhaps be objected to the above calculation, that the 
of light is conceived to be essentially the same as that of heat— 
if it is atomic vibrations for the one, it is also atomic vibrations 
tion of the sup- 
reduction of the heat evolved. 
Am. Jour. Scr.—Tump Series, Vor. V, No. 2%—Manca, 1873. 
13 
