268 Scientific Intelligence. 
I had arrived at the same conclusion from theoretical considerations 
several years ago, and had also deduced some further conclusions regar 
firmed by the experimental results of Prof. Tyndall. One of these con- 
clusions was, that the heat-vibration does not consist in a motion of an 
- aggregate mass of molecules, but in a motion of the individual molecules 
Each mo 
excursions across centres of equilibrium external to the atom itself? It 
as some others which will presently be noticed, are entirely hostile to such 
. ati . oye . 
to be affected by the state of aggregation, r the tension of the 
atom in regard to the centre, the more rapid ought its movement to be. 
is is case in regard to the vibrations constituting sound. The 
That heat-vibrations do not consist in excursions of the molecules of 
ws also, as a necessary conse- 
with the hardness of the body, because an increase in the stren 
of the foree binding the molecules together would in such a case tend to 
vor the rise in the rapidity of the vibrations. 
These conclusions ght into the hidden nature 
heat-vibrations, east some light on the physical 
the conclusion that 
