on some of the leading doctrines of caloric, &t\ 389 
And 5.98 x 161.7 = 967°, being the latent heat of the 
steam of water. 
2d. Alcohol. Boiling point 175 0 . Specific gravity 0.825. 
= 0.41 . 0.41 multiplied into the specific heat 
of liquid alcohol 0.65, is o°.266, which represents the eleva- 
tion of temperature produced by adding 200 gr. of boiling 
hot alcohol to 32340 gr. of water. The thermometer in the 
experiment rose 3 0 . 3 0 — o°.266 = 2.734,2.734 x 161.7 = 
442° = the latent heat of alcoholic vapour in equilibrio with 
the atmospheric pressure. By a similar process of calcula- 
tion the latent heat of the other vapours was determined. 
General table of latent heat of vapours • 
Vapour of water at its boiling point 967° 
alcohol - - 442 
ether - - 302.379 
petroleum - - 177.87 
oil of turpentine - 177.87 
nitric acid - 531.99 
liquid ammonia - 837.28 
vinegar - 875.00 
From the phenomena exhibited in the mechanical conden- 
sation and rarefaction of gases and vapours, as well as from 
their general constitution, it may be inferred, that an intimate 
and necessary connection subsists between their latent heat, 
elastic force, and specific weight or density. 
Hence, when their tension is the same, it appears reasonable 
to suppose that the product of their densities into their quan- 
tities of latent heat will also be the same. Repulsive energy 
