( 543 ) 



APPENDIX. 



MM. BERTHELOT and Vieille continued their researches on deto- 

 nating gaseous mixtures, 1 and their experimental results and their 

 conclusions are embodied in a series of papers published in the 

 *' Annales de Chimie et de Physique," 6 e serie, torn. iv. pp. 3-90 ; 

 but it is impossible in the space available to give here more than 

 a brief indication of the general character of the communications. 



The first is " On the calculation of the temperatures of combustion, 

 specific heats, and dissociation of detonating gaseous mixtures." This 

 is essentially theoretical in character. The second paper is entitled 

 " Experimental determinations of pressures" and the third relates 

 to the " Relative rapidity of combustion of various gaseous mixtures." 

 The fourth is on the " Influence of the density of gaseous mixtures on 

 the pressure, and isomeric mixtures. The experiments were made 

 both with . gaseous mixtures compressed beforehand and with 

 isomeric mixtures. 



The remaining four papers are theoretical, and treat of the 

 Calculation of the temperatures and specific heats of gaseous mixtures ; 

 the specific heats of gaseous elements at very high temperatures; 

 the specific heats of water and carbonic acid at very high tempera- 

 tures ; and finally, in the last paper, M. Berthelot examines the 

 manner in which the consequences which result from the experi- 

 ments affect two fundamental questions the scale of temperatures 

 and that of the molecular weights. 



The following results are taken from the second paper, on the 

 determinations of pressures : 



FIEST GROUP. HYDROGEN MIXTURES. 



I. Hydrogen and oxygen. Pressures. 



atm. 



(1) H 2 + O... 980 



(2) H 2 + O + H 2 8-82 



(3)H 2 + O+2H 3 8-02 



(4)H 2 + + 3H 2 7-06 



(5)H 2 +0 + 2 8-69 



(6)H 2 + O + 30 3 6-78 



p. 383. 



