CHAPTER XXL 



ON THE LAWS OF MOTION. 



AFTER the different properties, which have 

 been shown essentially to belong to the solid and 

 to the liquid to the expansible and elastic 

 matter of which the world is composed ; it will, 

 I trust, be readily admitted, that instead of 

 being one and the same, they are altogether 

 and absolutely different from each other. If a 

 general review of the whole system of nature 

 indeed be taken, it will lead us to conclude, that 

 a regular chain, of order and of subordination 

 subsists not only in the common matter of 

 which it is composed, but also in the various 

 orders of animated beings it contains. 



The analogy that subsists between the differ- 

 ent links of this vast chain is so close, and their 

 gradation so easy, that it is often very difficult 

 to say, where the one ends, and the other be- 

 gins ; what are the different marks by which 



