SPECIFIC HEAT OF GASES » 
281 
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VIII. 
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A Memoir on the Specific Heat of the Gases. By Messrs. F L 
Delaroche and Berard : To which the prize proposed by 
the Class of Mathematics and Natural Philosophy of the 
Institute of France, proposed in 181 1, has been awarded . 
Abstracted by the Authors. 
I N the original memoir, of which we here give , a detailed Accounts of 
extract, we have given an account of the labours of those and iSory of 
who have preceded us in the question of the specific heat of previous re- 
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the gases. This part of our work not being susceptible of ana- 
lyses, we must refer to it, and only remark, that, notwith- 
standing the labours of Crawford, Lavosier, and Laplace, 
Gay Lussac, and other philosophers, we were not in possession 
of accurate information on this subject, when our memoir was 
laid before the Institute*. We shall, therefore, without farther 
preface, state the results of our experiments, all of which were 
made in the laboratory of M. Berthollet, at Arcueil, and the 
processes we have followed in making them. 
Section I, 
Account of the Processes followed in making our Investigation. 
1. Description of the calorimeter .—The, intention of our en- Description of 
quiry was to determine the specific heat of the gases, according a caloumetei » 
to the import commonly attached to these words $ that is to say, 
to determine how much caloric is required to elevate each from 
j a given temperature to another temperature, also assumed and 
1 fixed, or, which amounts to the same thing, how much heat 
« We had deposited in the Office of the Institute, February 3, 1812, 
i a first Memoir containing the principal results of our investigations. 
Vol, XXXV,— No. 1(34. U they 
