CHAP. IV. 



Of those Things wherein Natural Bodies differ* 



1. Of the particular Properties 7. Of Moisture and Dryness? 



of Bodies. Heat and Cold. 



2. Of Light. 8. Or Gravity. 



3. Of Colours, 0. Of the other Properties of 



4. Of So.mds. Bodies. 



5. Or'Smells. 30. Or' occult Qualities. 

 . Of Tastes. 11. Reflections. 



LAVING considered wherein natural bodies 

 agree, we come now to consider the particular properties 

 wherein they disagree, and whereby they are distinguish- 

 ed from each other : those of them which are perceived 

 by our outward senses, are divided accordingly into 

 various classes, as they aiFect the sense of sight, of hear- 

 ing, of tasting, of smelling, or of feeling. 



2. Light seems to be one of the most subtle bodies in 

 the universe : the grand reservoir thereof is the sun ; 

 but it is likewise emitted by many other bodies, and by 

 almost ali when they are on fire. \Vhen it falls on any 

 body which it cannot pass through, and so is beat back, 

 it is said to be reflected : but when it passes from one 

 transparent body into another, which is either rarer or 

 denser, it moves obliquely, its rays being bent, and is 

 said to be refracted', when it passes through u body in 

 strait lines, it is said to be transmitted. Those which 

 emit the light are termed lucid bodies, those which re- 

 flect it, opake. 



The particles of light, minute as they are, are at- 

 tracted by those of other bodies : hence, in their pas- 

 B 4 



