222 APPENDIX A. 



result of a vibratory movement of the ethereal 

 fluid. Light produces heat, or at least accompa- 

 nies the radiating heat, and moves with the same 

 velocity as heat. Eadiating heat is then a vibratory 

 movement. It would be ridiculous to suppose that 

 it is an emission of matter while the light which 

 accompanies it could be only a movement. 



Could a motion (that of radiating heat) pro- 

 duce matter (caloric) ? 



No, undoubtedly; it can only produce a motion. 

 Heat is then the result of a motion. 



Then it is plain that it could be produced by the 

 consumption of motive power, and that it could 

 produce this power. 



All the other phenomena composition and de- 

 composition of bodies, passage to the gaseous state, 

 specific heat, equilibrium of heat, its more or less 

 easy transmission, its constancy in experiments 

 with the calorimeter could be explained by this 

 hypothesis. But it would be difficult to explain 

 why, in the development of motive power by heat, 

 a cold body is necessary ; why, in consuming the 

 heat of a warm body, motion cannot be produced. 



It appears very difficult to penetrate into the 

 real essence of bodies. To avoid erroneous reason- 

 ing, it would be necessary to investigate carefully 



