/ 
68 Heat developed in Condensation of Vapour of Alcohol. 
If to this quantity-of water (=24°422 eranumes) we add the 
4-648 grammes which were found mixed with 51:962 grammes 
of alcchol of Lowitz, in order to compose the 56°61 grammes 
of alcohol employed in the experiment, we shall Lave 29°07 
grammes of water which ought to have existed, ready iormed 
either in the common state ef water, or in some otier state, 
in the 56°61 grammes of alcohol condensed in the calori- 
meter. ; 
But the condensation of 29°07 grammes of steam into liquid 
water ought to have of themselves furnished more heat than we 
had in the experiment in question, in the eondensation of these 
29-07 grammes of elements of water, with 27°57 grammes of 
carbon and hydregen, which concur, with these elements, in 
forming the steam of the alechol which was condensed. 
If we apply a similar calculation to the results of the experi- 
ments made with alcohol which contained more water, the re- 
sult of the inyuiry will be still more striking. 
In the experiment No. 5. the alcohol employed was of the 
specific gravity of 85524 : _consequently 100 parts of this al- 
cohol were composed of 77°88 parts of alcohol of Lowitz, and 
22°12 water. 
And in the experiment 71°31 grammes of vapour of aléo- 
hol were condensed. 
There were therefore in these 71°23 grammes of condensed 
ea 
3688 grammes of alcohol of Lowitz, and 
“622 grammes of water. 
In the 55°688 grammes of alcohol of Lowitz there were 
26:102 grammes of water, according to the analysis of M. de 
Saussure ; and this last quantity of water (=26°012 grammes) 
added to the quantity found above, viz. 15-622 grammes, makes 
4)-727 grammes of water which ought to have existed, either 
as steam or otherwise, in the 71:31 grammes of alcoholic vapour 
condensed in the calorimeter , in the experiment in question. 
In order to simplify our calculation, and to render our com- 
parisons more Bie we shall show how much pure water, 
in vapour, ought to have been sufficient to furnish, in its con- 
densation, the same quantity of heat which was furnished by the 
‘condensation of 71-31 grammes of alcoholic vapour, in the ex- 
periment in question. 
In this experiment the temperature of the calorimeter was 
raised to 144 degrees of Fahrenheit. 
In the second experiment, made with the steam of pure 
water, the temperature of the same calorimeter was raised 104 
degrees of Fahrenheit, with the heat developed in the conden- 
sation of 24°4 grammes of this vapour. 
Conse-~ 
