On the Power of Fluids to conduct Heat. 395 
After what has been said, I need not caution 
my readers not to consider this table as accurate. 
The principle of it, however, cannot I conceive be 
disproved: that the operation of the conducting 
power must be proportionate to a series of num- 
bers beginning from o at 32°, and gradually in- 
creasing in some ratio with the temperature 
above 32°, cannot, I think, be controverted; 
and that the operation of the internal motion 
must begin from o at 32°, and increase till it 
arrives at its maximum at 42°3, and then decrease 
again ever after, is also, I apprehend, unquestion- 
able; thus, when the jar had water of 42°, in 
Count R.’s experiments, this internal motion 
must have had a range of 8 inches in depth; 
whereas, when hot water alone was used, it had 
not more than 3 of aninch to range from the 
temperature of 32 to that of 59°. 
The following table exhibits a concise view 
of all the materiai varieties of Count Rumford’s 
experiments, with their result, 
