ELEMENTS 



NATURAL PHILOSOPHY, 



CHAP. I. 



Of Matter and Motion. 



MATTER is an extended solid* sub- 

 stance ; which being comprehended un- 

 der distinct surfaces, makes so many par* 

 ticular distinct bodies. 



* Solidity is not here considered as opposed to 

 fluidity, but as that property which every body 

 possesses of not permitting' any other substance to 

 occupy the same place with it at the same time ; 

 so that both water and air, and every other fluid, 

 are equally solid, in this sense of the word, with 

 the hardest body. By solidity, in common lan- 

 guage, is understood the property of not being* 

 easily separated into parts ; and therefore the 

 reader must be careful not to confound the mean- 

 ing- of the popular with the philosophical terro* 



