GALILEO GALILEI 45 



on its axis, inclined by nature as much toward motion as the rest, sur- 

 rounded by a fluid medium, is not seized on by this general revolution. 

 We do not encounter this difficulty, however, if we suppose the earth 

 to move, a body so small, .so inconsiderable in comparison with the 

 whole universe that it could have no effect at all upon thi5. 



