PHYSICAL ann LITERARY. 79 
ber of founds too fmall to be heard fepa- 
rately, at laft form an audible’ found *. 
Quer, XII. Since bodies derive their 
colours from the original and immutable 
qualities of thofe rays which they reflect 
moft 
*® Sore fceptics have difputed againft the endlefs di- 
vifibility of quantity, becaufe the imagination foon ar- 
fives at a minimum; alledging from thence, that our t- 
dea of extenfion involves the notion of indivifibles, and is 
as it were compounded of them, Nothing corporeal can 
be imagined or conceived at all which is not eonceived 
as feen, handled, or otherways fenfibly perceived. Ima- 
ginative ideas are nothing elfe than tranfcripts or images 
of fenfations, and therefore muft be limited by the fame 
bounds and in the fame manner as fenfation. Now the 
minimum fenfibile is rather in all cafes a confufed, indi- 
ftin@ and uncertain tranfition from perceivable to not 
perceivable, than the clear perception of a point indivifible 
in magnitude; for its magnitude depends on the luitre 
of the objet. That nothing can be conceived or ima- 
ginéd which is lefs than a certain bulk, is no more an ar- 
gument againit the endlefs divifibility of quantity, than 
that nothing can be felt or feen below that fize; which, 
it is evident, from every magnifying ylafs and from every 
d fferent diftance of an object, depends not at all on the 
conttitution of the ‘thing perceived, but on that cf the 
perceiver, or the means and circumftances of his per- 
ception, 
Nor, though it were granted that the mizimum vifibile 
is diftin@ly feen as an indivifible point, would it follow, 
that 
