127. It having been shown that there are no abstract ideas of figure, and
that it is impossible for us by any precision of thought to frame an idea
of extension separate from all other visible and tangible qualities which
shall be common both to sight and touch: the question now remaining is,
whether the particular extensions, figures, and motions perceived by
sight be of the same kind with the particular extensions, figures, and
motions perceived by touch? In answer to which I shall venture to lay
down the following proposition: THE EXTENSION, FIGURES, AND MOTIONS
PERCEIVED BY SIGHT ARE SPECIFICALLY DISTINCT FROM THE IDEAS OF TOUCH
CALLED BY THE SAME NAMES, NOR is THERE ANY SUCH THING as ONE IDEA OR KIND
OF IDEA COMMON TO BOTH SENSES. This proposition may without much
difficulty be collected from what hath been said in several places of
this essay. But because it seems so remote from, and contrary to, the
received notions and settled opinion of mankind, I shall attempt to
demonstrate it more particularly and at large by the following arguments.
128. When upon perception of an idea I range it under this or that sort,
it is because it is perceived after the same manner, or because it has a
likeness or conformity with, or affects me in the same way as, the ideas
of the sort I rank it under.
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