PHYSICAL AND LITERAL?, -^t 



ftinguilh the feparate points. In whatever 

 manner fenfation be performed, it is certain', 

 that the organs which receive the firft im- 

 pulfe from external objedls cannot convey to 

 us any ideas, if they, or the iiiipreffions' made 

 by them, be lefs; than of a; certain definite 

 magnitude. A nuniber of things feparatdy 

 intangible, if joined together,- may be felt by 

 the touch: A certain nuniber of inviiible 

 points become fufficient to affed: the fight 

 by their united rays ; and a certain number 

 of founds too fmall to be heard feparately, at 

 kfl: form an audible found *. 



QXJER. 



it is greatly retarded or brought to reft, muft appear very 

 luminous or divided by white rods, for the fame reafon that 

 they appear at the fides. 



* Some Sceptics have difputed againft the endlefs dlviii- 

 bility of quantity, becaufe the imagination foon arrives at S 

 minimum ; alledging from thence, that our idea of extenfioa 

 involves the notion of indivifibles, and is as it were com- 

 pounded of them. Nothing corporeal can- be imagined or 

 conceived at all which h not conceived as feen, handled, or 

 otherways fenfiWy perceived. Imaginative ideas are nothing 

 elfe than tranfcripts or images of fenfations, and therefore 

 mufl: be limited by the fame bounds and in the fame manner 

 as fenfation. Now the minimum fenfibik is rather in all cafes 

 a confufed, indillindl and uncertain tranfition from per^ 

 teivable to not perceivable, than the clear perception of a 

 point indivifible in magnitude ; for its magnitude depends 



