On the Power of Fluids to conduct Heat. 382 
mometer down to the middle, the colour at last 
rose in a small degree. 
(Air 45°) 
TEMPERATURE 
at top. middle. bottom. 
Before the warm water was poured on . . 44° 
Time 105° — ae 
7min, = 97 = 47+ 
17 86 — 48 
27 79 Mee eae 49. 
37 75 68 _§0 
47 qo 66 50+ 
57 66 62 51t 
1h. 7 60 62 Rin. 
Fal 604 59 bit 
— 27 59 a 51z 
Experiment 5. 
A glass tube near an inch in diameter, and 
36 inches long, was half filled with a coloured 
solution ‘of common salt in water, warm; a small 
thermometer was wholly immersed in it, and 
cold clear water carefully poured upon the whole 
so as'to fill the tube; the colour ascended very 
little, and continued invariable after the process 
of filling.—The warm solution was of course 
made of greater specific gravity than the cold 
water, 
I 
