— 185 —
      §11. This also happens, where the Motion is so slow, as not to
supply a constant train of fresh Ideas to the Senses, as fast as the
Mind is capable of receiving new ones into it; and so other Ideas of
our own Thoughts, having room to come into our Minds, between
those offered to our Senses by the moving Body, there the Sense of
Motion is lost; and the Body, though it really moves, yet not chang-
ing perceivable distance with some other Bodies, as fast as the Ideas
of our own Minds do naturally follow one another in train, the
thing seems to stand still, as is evident in the Hands of Clocks, and
Shadows of Sun-dials, and other constant, but slow Motions, where
though after certain Intervals, we perceive by the change of dis-
tance, that it hath moved, yet the Motion it self we perceive not.
Locke Hum II, 14, §11, p. 185