]j5 ON THC HEAT DEVELOPED IN COMBUSTION. 



Mean of the ^ we * n ^ e ^ ie me:m ttrm between the results of these ex- 



three experi- periments, we shall find, that the quantity of heat developed 

 in the combustion of wax is such, that one pound of this sub- 

 stance is sufficient, to raise 94'()82ibs of water from the tem- 

 perature of melting ice to the boiling point; and conse- 

 quently, that it should melt 1 26*2421 bs of ice. 

 Remits of La- According to the experiments of Mr. Lavoisier, the heat 

 ToiLitr's. developed in the combustion of one pound of white wax was 



sufficient to melt lSS'lOu'lbs of ice. 



Tho difference The difference between the results of our experiments with 



s, » a11 : this substance, is not very great ; and, if those of Mr. Lavoi- 



sipr were made at a time, when the temperature of the air was 



only a few degrees higher than that of melting ice (which I 



have no means of ascertaining), the quantity of nitrogen, that 



hut grea> in must have entered into the calorimeter with the oxigen em- 



cqnrbusticJn of p( C y ec j t support the combustion, would have been so great 



as to account sufficiently for the difference. But the very 



great difference between the results of our experiments made 



with olive oil proves, that one or other of our processes must 



have been defective. 



Resul! of the The mean result of several experiments made with olive 



aui ors ex#e- Q ^ g„ ve rne f or t |, e measure of the quantity of heat developed 



in the combustion of one pound of this substance 90'439lbs 



of water heated 180° F; or 120lbs of ice melted, neglecting 



the fraction. 



and of -Lavoi- * n tn e experiments of Mr. Lavoisier more than 148lbs of 



«'i' 8 ' ice were melted by the heat, that appeared to result from the 



combustion of one pound of this oil. 



The latter sus- It is true, that this result was considered by that eminent 



pi cied to he philosopher himself as too £reat to be capable of explanation ; 



i.T-;u by him- ' ' _ n ' r . 



self. and he added, with that modesty which rendered him so en- 



gaging and so respectable: " We shall probably find our- 

 selves under the necessity of making corrections, perhaps 

 pretty considerable ones, in most of the results I have given : 

 but I did not think this a sufficient reason, to delay affording 

 their -assistance to those, who might intend to pursue the 

 same object." 



Rape oil pari- As it appears very probable, that all the fat oils, when per- 

 fectly pure, are composed of the same principles, Iwascuri- 



♦rrdby sulplui 

 ric acid corn 



pared with ous to see whether rape oil, purified by sulphuric acid, would 



ive <>ii. 



not 



