55 
Experiments upon Heat. 
The following table shows the results of the experiments, 
with the various substances therein mentioned : 
Heat lost. 
< 
^2 . 
1 « 
% 
X 
0 
0 . 
£ 2 
* bjO 
Cuio 
0 ft 
zj 
c 7 S 
Cotton wool, 
i6grs. 
Fine lint, 
16 grs. 
Beavers fur, 
t6 grs. 
Hares fur, 
16 grs. 
Eiderdown, 
16 grs. 
Exp. 1. 
Exp. 4. 
Exp. 5. 
Exp. 6. 
Exp. 7. 
Exp. 8. 
Exp. 9. 
Exp. 10. 
70 ° 
6 o° 
38" 
94 ” 
7 9" 
»S" 
80" 
99" 
97 ” 
98” 
5 °° 
46' 
110 
95 
95 
93 
ll6’ 
117 
ll6 
40 0 
59 
1 33 
118 
-117 
115 
153 
144 
14b 
3 °° 
80 
185 
162 
152 
150 
18 5 
193 
192 
20° 
122 
2 73 
238 
221 
218 
265 
270 
26*8 
10° 
231 
489 
426 
37 8 
376 
47 8 
494 
485 
Total times- 
57 6 
1284 
1118 
1046 
1032 
1296 
1315 
1 3°5 
Now the warmth of a body, or its power to confine heat, 
being as its power of resisting the passage of heat through it 
(which I shall call its non-conducting power), and the time taken 
lip by any body in cooling, which is surrounded by any medium 
through which the heat is obliged to pass, being, cceteris pari- 
bus, as the resistance which the medium opposes to the passage 
of the heat, it appears that the warmth of the bodies mentioned 
in the foregoing table are as the times of cooling ; the conduct- 
ing powers being inversely as those times, as I have formerly 
shown. 
From the results of the foregoing experiments it appears, 
that of the seven different substances made use of, hares fur 
and Eider down were the warmest ; after these came beavers 
fur ; raw silk ; sheep's wool ; cotton wool ; and lastly, lint, 
or the scrapings of fine linen ; but I acknowledge that the 
