, /CHAPTER X 



ON THE GRAVITY AND LEVITY OF SOLIDS ANX> 

 LIQUIDS. 



WHENEVER there subsists a difference in the 

 quantity of matter, which any body contains 

 within a given bulk, with relation to the quan- 

 tity of matter which it displaces the state of 

 equilibrium, or of balance, becomes destroy- 

 ed ; instead of such a mass of matter, remain- 

 ing suspended in equilibrio, it either rises or 

 falls ; the weight, or pressure, downwards, is the 

 measure of the difference which exists between 

 the density of the one, and the rarity of the 

 other : and, on the contrary, the levity or 

 pressure upwards, is the test of the rarity of 

 the one, with respect to the density of the 

 other. 



If a body contains as much matter as it dis- 

 places, it remains suspended and balanced; 



Q 



