9 6 Count Rumford’s Enquiry concerning the Nature of Heat, 
the cooling of the instrument, in the manner it was found to do, 
is what still remains to be shown : but, before I proceed any 
farther in these abstruse enquiries, I shall make a few observa- 
tions relative to the results of the foregoing experiments. 
Although we may with safety presume, that the velocities 
with which the heat escaped through the sides of the instruments ,* 
were nearly as the times inversely taken up in cooling through 
the given interval of i o degrees ; yet, as some heat must have 
made its way, in the course of the experiment, through the ends 
of the instrument, notwithstanding all the care that was taken to 
prevent it, by covering them up with warm clothing, it is neces- 
sary, in order to be able to compare the results of the preceding 
experiments in a satisfactory manner, to find out how much of 
the heat made its escape through the covered ends of the instru- 
ments, during the time the instruments were cooling through 
the interval in question. 
In order to determine that point, I now removed the covering 
from the ends of the instrument No. 1 ; and, when it was quite 
naked, I found, on making the experiment, that it cooled through 
the given interval in 45^ minutes. 
When its two ends and its cylindrical neck were covered up 
* I have found myself obliged in this, as in many other places, to make use of lan- 
guage wh’ch is far from being as correct as I could wish. I do not believe that heat 
ever makes its escape in the manner here indicated ; but I could not venture ro use 
uncommon expressions, in pointing out the phenomena in question, however well 
adapted such expressions might be to describe the events which really take place. If it 
should be found that caloric, like phlogiston, is merely a creature of the imagination, 
and has no real existence, (which has ever appeared to me to be extremely probable,) 
in that case, it must be incorrect to speak of heat as making its escape out of one 
body, and passing into another : but how often are we obliged to use incorrect and 
figurative language, in speaking of natural phenomena ! 
