-4 Experiments on. the 
steam at fhe common boiling temperature. I 
take for granted it will be remembexed, that 
the steam which rises from boiling water ine 
dicates the same degree of heat to the ther- 
mometer as the water does, viz. 212°; but 
that it, in fact, contains about 940° of latent 
heat, not appreciable by the thermometer ;—- 
so, that if steam, which is double the force of 
the atmosphere, had combined with a propox- 
tionate quantity of heat, it must necessarily 
contain. upwards of 1800° of heat more than 
what. would be indicated by the thermometer, 
at least, if we consider the latter steam of 
the same density as the former. 
I proceed to an explanation of the experi- 
ments. 
First Class of Experimenis. 
IT procured a small oblong cast-iron boiler, 
capable of holding about two gallons of water, 
into which was fitted a thermometer, gradu- 
ated considerably above the boiling pot; 
also two stop cocks, with joints and screws to 
connect with different sorts of apparatus.— 
Underneath was fixed a trough to contain 
spirits of wine, the lid perforated. with two 
rows, of six holes each, for the cotton wicks, 
Being desirous of keeping the heat as equal 
