ders, are
so familiar as to be automatic; his mind is on the motion of the
ship as a whole. In such a case we can imagine that he identifies
himself with the ship; all that enters his conscious thought is the
direction of its movement over the plane surface of the ocean.

"Such is the relation, as I imagine it, of the soul to the body. A
relation which we can imagine as existing momentarily in the case of
the captain is the normal one in the case of the soul with its craft.
As the captain is capable of a kind of movement, an amplitude of
motion, which does not enter into his thoughts with regard to the
directing of the ship over the plane surface of the ocean, so the
soul is capable of a kind of movement, has an amplitude of motion,
which is not used in its task of directing the body in the
three-dimensional region in which the body's activity lies. If for
any reason it becomes necessary for the captain to consider
three-dimensional motions with regard to his ship, it would not be
difficult for him to gain the materials for thinking about such
motions; all he has to do is to call experience into play. As far as
the navigation of the ship is concerned, however, he is not obliged
to call on such experience. The ship as a whole simply moves on a
surface. The problem of three-dimensional movement does not
ordinarily concern its steering. And thus with regard to ourselves
all those movements and activities which characterize our bodily
organs are three-dimensional; we never need to consider the ampler
movements. But we do more than use these movements of our body to
effect our aims by direct means; we have now come to the pass when
we act indirectly on nature, when we call processes into play which
lie beyond the reach of any explanation we can give by the kind of
thought which has been sufficient for the steering of our craft as a
whole.

"When we come to the problem of what goes on in the minute and apply
ourselves to the mechanism of the minute, we find our habitual
conceptions inadequate. The captain in us must wake up to his own
intimate nature, realize those functions of movement which are his
own, and in the virtue of his knowledge of them apprehend how to
deal with the problems he has come to."

_The Fourth Dimension_.

How more accurately and eloquently could "the captain in us,"
momentarily aroused, give voice to his predicament, than in the words,
"_Instead of the sublime and open world, the narrow prison