in Fluids. 



259 



In cooling the") 

 Thermometer 1 

 00° to [ 



from : 



180° • • • j 



from 1 80° to 160° 



160 to 140 



120 



100 



80 



60 



40 



Total times in ~1 

 cooling from > 

 200° to 40° J 



Times employed ~) 

 in cooling the j 

 instrument 80 \ 

 degrees, viz. j 

 from i6o°to8o° J 



As the results of these experiments prove, in the most 

 decisive manner, that the propagation of Heat in water 

 is retarded, not only by those things which diminish its 

 fluidity, but also by those which, by mechanical means, 

 and without forming any combination with it whatever, 

 merely obstruct its internal motions, it appears to me 

 that this proves, almost to a demonstration, that Heat is 

 propagated in water in consequence of its internal motions, 

 or that it is transported or carried by the particles of that 

 liquid, and that it does not spread and expand in it, as 

 has generally been imagined. 



