four-dimensional, because then a light wave would be a superficial
disturbance of the medium--superficial, but three-dimensional, as
must needs be the case with the surface of a four-dimensional solid.

* * * * *

This search for evidences of hyper-dimensionality in the universe
accessible to our senses is like looking, not for a needle in a
haystack, but for a haystack in a needle--for the greater in the less.
From the purely physical evidences, all that can with certainty be
said is that the hypothesis is not inconsistent with the facts of
science or its laws; that it is being verified and rendered more
probable by the investigations of science; that it is applicable to
the description or explanation of all the observed phenomena, and
assigns a cause fully adequate to have produced them.

Now there is an order of phenomena that we call psychic. Because
they are phenomenal they cannot occur outside of time and space
altogether; because they are psychic they defy explanation in terms
of the space and time of every-day life. Let us next examine these
in the light of our hypothesis.




IV TRANSCENDENTAL PHYSICS

ZÖLLNER

In the year 1877, Johann Friedrich Zöllner, professor of physics and