on some of the leading Doctrines of Caloric, &c. 93 
By Biot’s formula therefore at 232° F. .,  43°620 
My. experiments «340. sie) ecersdeep ao, 44°00 
Mr. Dalton’s table REI HE ie: star 4 
Betancourt .. 88° clatter 2O 
By M. Pouillet’s table at ‘the end of Biot’s Ist vol. 
computed from the above formula .. 43°500 
The difference between Biot and my experiments here is only 
1°10 inches. 
2d Example. Temperature 262° Fahr. f = 50 
50a= 0°4270609 
2500 b = —0:0520272 
125000 c = +0:°0007250 
0:°3757587 
Log. 30 = = 14771213 
———E—————EE + 
Log. of Fygco= 1°8528800 Fogoo= 71265 
' Experiment .. 74°600 
Dalton’s table '69°700 
Pouillet’s table 70°800 
Betancourt .. $2°500 
The disparity between Biot’s formula and experiment becomes 
more apparent now: it amounts to 3°330 inches. 
At 266° Fahr. which corresponds to 180° centigrade, I make 
it from Biot’s first formula 77-053, while at 130° by M. Pouillet, 
it is 75°68 *; difference 1-973. "Finally, 
At the temperature Grass: pee 100 
100 a= -*& +854121972 
10-000 4 = —0°208109100 
1000000 ¢ =+-0:005S00000 
0-651812872 
1-477121300 
Log. of F, =2'128934172 F-=Fig) = 134°57 
Experiment gives 167-00 
Mr. Dalton’s table 125:°85 
The difference between experiment, and both calculations, is 
now excessive, and even between the two latter it amounts to 
nearly nine inches. 
From this ample investigation, we may legitimately conclude, 
* 130° centigr. gives by M.P. force of vapour =1907'07 millimetres ; of 
1907°07 
25°4 
which taking 25°4 to the English inch, we have =75'08 as above. 
that 
