*47 
and the Mode of its Communication . 
No. 6 , was kept ice-cold, by means of pounded ice and water, 
which was put into the earthen dish on the brim of which it 
was supported. 
The times of the cooling of the vessels, through the standard 
interval of 10 degrees, were as follows. 
No. 5 - - - in 40^ minutes. 
No. 6, which was over ice, in 33^ 
Exper. No. 33. I repeated this experiment once more, but 
varied it, by bringing the pewter platters still nearer to the 
bottoms of the conical vessels. The flat horizontal part of each 
of the platters, was now only 2 inches below the flat surface of 
the bottom of the conical vessel which was suspended over it. 
Both the platters still remained covered by their flat circular 
perforated covers of paper ; but it should be remembered, that 
the circular hole in the centre of each of these covers was no 
less than 6 inches in diameter, and consequently, that a large 
portion of the flat part of the bottom of the platter was in full 
view' (if I may use that expression) of the bottom of the vessel 
which was suspended over it. 
The times of cooling, in this experiment, were as follows. 
No. 5 cooled through the given interval in 42^ minutes. 
No. 6, which was over ice - - in 32-I- minutes. 
The results of these experiments show, (what indeed might 
have been expected, especially on a supposition that the heating 
and cooling of bodies is effected by means of radiations,) that 
although the cooling of the hot body suspended over a surface 
kept constantly cold by artificial means, was accelerated by 
being brought nearer to that cold surface, yet, in a case where 
the cold surface was less intensely cold, and where its tempera- 
U 2 
