382 On the Power of Fluids to conduct Heat. 
the water about I inch, when it rose ina few 
seconds to 180°. 
_ TEMPERATURE 
Time. at top. middle. bottom. 
Before the poker was immersed ......---+e0++-= 47° 
— 180° 47° 
5 min. 100 60° A7t 
\ £0 70 60 49 
1h.— 55 _— 52 
These experiments all evidently agree in 
proving water to have a proper conducting 
power, independent of any internal motion.— 
It surely will not be said that any slight motion 
unavoidably made at the beginning of an ex- 
periment, could continue with a powerful effect 
‘for upwards of an hour.—However, to determine 
this matter, I made the two following experi- 
ments, 
Experiment 4. 
Took the glass tumbler of the first experiment, 
and filled it half way with rain water, deeply 
tinged with archil; then filled it up with clear 
warm water, as related in the 2d experiment.— 
The upper half was but just perceptibly tinged 
by the process and uniformly so; it remained 
for an hour not visibly altered in this respect, 
though by frequently putting the bulb of a ther- 
