On the Power of Fluds to conduct Héat. 389 
liquids, the uniform temperature should be ‘so 
soon induced by agitaticn and°so’ slowly, by'rest = 
But when we consider, that in the former case, 
hot and cold particles are brought together, and 
that in the latter there is a series of particles one 
upon another, gradually rising in temperature, 
but differing by- insensible degrees, we shall 
not wonder at the facts. When any one par- 
ticle of water, or any ‘other body, has one above 
it, warmer by an insensible degree, and another 
below it, colder ‘by an insensible degree,’ its 
power to transmit heat must be very small,— 
These considerations gave rise to the two fol- 
roping, experiments, 
Experiment 10. 
A mercurial. thermometer was taken, its 
bulb ¥ inch in diameter, and hanging clear of 
the scale: It was heated by the;flame of a 
candle to 600°, and then laid upon a table with 
the bulb projecting over the edge, and was thus 
left to cool by the mere operation of the air in 
the room, which was 52°.—The following is the 
medium result of two experiments, hi thas how- 
ever, agreed with each other almost in every 
observation, 9 
