— 426 —
      §13. He that should use the word Rainbow, to one who knew all
those Colours, but yet had never seen that Phaenomenon, would, by
enumerating the Figure, Largeness, Position, and Order of the
Colours, so well define that word, that it might be perfectly under-
stood. But yet that Definition, how exact and perfect soever, would
never make a blind Man understand it; because several of the
simple Ideas that make that complex one, being such as he never
received by Sensation and Experience, no words are able to excite
them in his Mind.
Locke Hum III, 4, §13, p. 426