9. The train of ideas has a certain degree of quickness.
Hence I leave it to others to judge, whether it be not
probable that our ideas do, whilst we are awake, succeed one another in our minds at certain distances; not much
unlike the images in the inside of a lantern, turned round by the heat of a candle. This appearance of theirs in
train, though perhaps it may be sometimes faster and sometimes slower, yet, I guess, varies not very much in a
waking man: there seem to be certain bounds to the quickness and slowness of the succession of those ideas one
to another in our minds, beyond which they can neither delay nor hasten.