140 A Trettife of BODIES. Chap, 13. 



ceflary; for going through a pore bigger then it felf > or at the 

 leaft as big; and finding it full of a ire, ic muft needs be crowded 



CJ O 



thcre.Biit in a crowd, he prefleth you moft who you preflc moft 

 upon:fo then that fide of the pore which is next to^the light as ic 



palfeth, muft preflc moft 

 upon itrbut the angle w clv 

 is towards the perpendi- 

 cular, to wit, the angle 

 B C L is the letter; & by 

 confequencc , the ray is 

 nearer that fide of the 

 pore which is towards I, 

 then the other fide of it 

 w ch is towards H; where-, 

 fore it muft take its ply 



from that fide. But that fide ftrikerh it from the perpendicular: 

 and therefore it muft there refraft from the perpendicular. 



This very fame doclrine for the reafon of refraction is con- 

 firmed by what happeneth in crooked fupcrficiefes. As if E F 



be a Lens or a glafle on 

 both fides convex; and 

 C B the axis of it; A D 

 the ray falling from the 

 illuminant A ; A B the 

 perpendicular falling fro 

 the fame illuminant A:it 

 will be plain by the for- 

 mer difcourfe, that the 

 ray A D, muft at the en- 

 try be refradted towards 

 A B , as being repulfed 

 from that part of the in- 

 fide of the pore D, which 

 is towards Fjbecaufe that 

 fide is moft oppofed unto 

 thcray.Now the ray be- 

 ing once turned that 

 \vay; when at the end of 

 its journey through the 

 glafle 



