and the Mode of its Communication. 95 



(62), while that placed under the vessel 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^ " 



Experiment 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 con- 

 ical vessel which was suspended over it. Both the plat- 

 ters 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 fol- 

 lows : 



No. 5 cooled through the given interval in 42! minutes. 

 No. 6, which was over ice, . . in 32^ " 



The results of these experiments show (what indeed 

 might have been expected, especially on the 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 



