ce : , Reta t 
420 : ® Hare's Culorimotor. 
a hollow brass cylinder, having the internal diameter two 
inches, and the outside of another smaller cylinder of the same 
substance, were made conical and correspondent, so that the 
greater would contain the less, and leave an interstice about 
one-sixteenth of an inch between them. ‘This interstice was 
filled with wood, by plugging the larger cylinder with this ma- 
terial, and excavating the plug till it would permit the smaller 
brass cylinder to be driven in. The excavation and the fitting 
of the cylinders was performed accurately by means of a turn- 
ing lathe. ‘The wood in the interstice was then charred by ex- 
posing the whole covered by sand in a crucible to a red heat. 
~The charcoal notwithstanding the shrinkage consequent to the 
fire, was brought into complete contact with the enclosing me- 
tallic surfaces by pressing the interior cylinder further into the 
exterior one. : 
-‘'Lbus prepared, the interior cylinder being made to touch 
one of the Galvanic surfaces, a wire brought from the other 
Gaivanic surface into contact with the outside cylinder, was 
not affected in the least, though the slightest touch of the 
interior one caused ignition. ‘The contact of the charcoal with 
the. containing metals probably took place throughout a superfi- 
cies of four square inches, and the wire was not much more 
than the hundredth part of an inch thick, so that unless it were 
to conduct electricity about forty thousand times better than 
the charcoal, it ought to have been heated; if the calorific 
influence of this apparatus result from electrical excitement. 
[am led finally to suppose, that the contact of dissimilar 
metals, when subjected to the action of solvents, causes @ 
movement in caloric as well as in the electric fluid, and that 
the phenomena of Galvanism, the unlimited evolution of beat 
by friction, the extrication of gaseous matter without the pro- 
duction of cold, might all be explained by supposing a combi- 
nation between the fluids of heat and electricity. We find 
scarcely any two kinds of ponderable maiter which do not ex- 
ercise more or less affinity towards each other. Moreover, 
imponderable particles are supposed highly attractive of pon- 
derable ones. Why then should we not infer the existence of 
similar affinities between imponderable particles reciprocally ? 
