ON THE POWER OF FLUIDS TO CONDUCT HEAT. 87 



After what has been (aid, I need not caution my readers Obfervationswi 

 not to confider this table as accurate. The principle of it, 

 however, cannot I conceive be difproved : that the operation 

 of the conducting power muit be proportionate to a feries of 

 numbers beginning from at 32°, and gradually increafing in 

 fome ratio with the temperature above 32°, cannot, I think, 

 be controverted ; and that the operation of the internal mo- 

 tion muft begin from at 32°, and increafe till it arrives at 

 its maximum at 4-2|°, and then'decreafe again ever after, is 

 alfo, I apprehend, unqueitionable : thus, when the jar had 

 water of 42°, in Count R's experiments, this internal motion 

 mud have had a range of 8 inches in depth ; whereas, when 

 hot water alone was ufed, it had not more than | of an inch 

 to range from the temperature of 32 to that of 53°. 



The following table exhibits a concife view of all the mate- Table of the va- 

 rial varieties of Count Rumford's Experiments, with their re- rieties C) *" the 

 /\.n,. Count's experi* 



*^ * ments. 



Experiment 



