*37 
and the Mode of its Communication. 
possible, the cylinders of pasteboard by which the sides of the 
conical vessels were covered, and defended from the air; and 
the warm coverings of fur (rabbit-skins) were put over all. 
To confine the heat still more effectually, a quantity of eider- 
down had been introduced between the outside of each conical 
vessel, and its cylindrical neck, and the inside of the hollow 
cylinder of pasteboard in the axis of which it was fixed and 
confined. 
The result of this experiment was very conclusive. The conical 
vessel which was suspended over the ice-cold pewter platter, 
cooled through the standard interval of 10 degrees, (namely, 
from the point of 50 degrees to that of 40 degrees above the 
temperature of the air of the room,) in 33 minutes and 42 se- 
conds ; whereas, the other vessel, which was not over ice, required 
39 minutes and 15 seconds, to cool through the same interval. 
Exper. No. 30. On repeating this experiment the next day, 
the air of the room still remaining at 63°, the times of cooling 
through the given interval were as follows. Min . ^ c . 
The vessel suspended over the ice-cold platter, in 33 15 
The other vessel, in - - - - 39 30 
From the results of these experiments (which were made 
with the greatest possible care) it appears, that the radiations of 
cold bodies act on warmer bodies, at a distance , and gradually 
diminish their temperatures. 
It will likewise be evident, when we consider the matter with 
attention, that the cooling of the vessel which was suspended 
over the ice-cold platter, was in fact considerably more acce- 
lerated by the frigorific radiations from that cold surface than 
it appears to have been, when we estimate the effects produced 
MDCCCIV. T 
