...these experiments, except it be motion.' In 1812, Davy wrote : ' The immediate cause of the phenomena of heat, then, is motion, and the laws of its communication...the same as the laws of the communication of motion ; ' * and he confirmed his views by that original and most interesting experiment in which ho melted...

...: " As would appear from Count Rumford's experiments, the immediate cause of the phenomenon of heat is motion, and the laws of its communication are precisely...same as the laws of the communication of motion." And again, (Memoir on heat, &c., Works, vol. ii.) : -"It has been experimentally demonstrated that...

...equally evident that its parts must have separated from each other. The immediate cause of the phenomenon of heat, then, is motion ; and the laws of its communication...motion. ' Since all matter may be made to fill a smaller space by cooling, it IB evident that the particles of matter must have space between them ; and since...

...following perfectly definite and most important proposition :— ' The immediate cause of the phenomenon of heat, then, is motion, and the laws of its communication...same as the laws of the communication of motion.' The immense consequences of this statement we shall presently consider, after we have briefly described...

...the ice itself. Hence Davy * drew the conclusion that, "The immediate cause of the phenomena of heat is motion, and the laws of its communication are precisely...same as the laws of the communication of motion." The mechanical, or dynamical theory, which regarded heat as consisting in a state of molecular motion,...

...DAVY ON THE MOTION OF HEAT. 113 ommunication are precisely the same as the laws of the commudcation of motion.' Since all matter may be made to fill a smaller space by cooing, it is evident that the particles of matter must have space be;ween them ; and since...

...the ice itself. Hence Davy* drew the conclusion that, "The immediate cause of the phenomena of heat is motion, and the laws of its communication are precisely...same as the laws of the communication of motion." The mechanical, or dynamical theory, which regarded heat as consisting in a state of molecular motion,...

...same as the laws of the communieation of motion.' Since all matter may be made to fill a smaller space by cooling, it is evident that the particles of matter...must have space between them ; and since every body ean communicate the power of expansion to a body of a lower temperature — that is, can give an expansive...

...own results, and expressed himself in very similar terms: — "The immediate cause of the phenomena of heat then is motion, and the laws of its communication are precisely the same as the laws of the communicat ion of motion." (Elements tif Chi-mical Philosophy, London, 1812, pp. 94, 95.) Similar views...

...for the first time clearly stated the conclusion that " the immediate cause of the phenomena of heat is motion, and the laws of its communication are precisely the same as those of the communication of motion." Dr. Youmans, with admirable distinctness of statement and with...