physics in all their minute ramifications; but it is necessary
that they should understand clearly the fundamental principles
upon which our scientific and technical knowledge of today rests.

These fundamental principles have been discovered and applied in
the past fifty years--in the memory of the living. They have
revolutionized science in all its departments. Our textbooks on
Chemistry, Light, Heat, Electricity and Sound have had to be
entirely re-written; and in many other departments, notably in
medicine and psychology, they have yet to be re-written. Our
textbooks are in a transition state, each new one going a step
farther, to make the change gradual from the old forms of belief
to the new, so that even Tyndall's textbook on "Sound" is now so
antedated, or antiquated, that it might have been written in
darkest Africa before the pyramids were built, instead of twenty
years ago.

All this change has flowed from the discovery of Faraday that
there are two states or conditions of matter. In one it is
revealed by one of our five senses, visible, tangible, smellable,
tastable, or ponderable matter. This is matter as we know it.
It may be a lump of metal or a flask of gas.

The second condition or state of matter is not revealed by either
of our five senses, but by the sixth sense, or intuition of man.
This is the ether--supposed to be "matter in a very rarefied
form, which permeates all space." So rare and fine is this
matter that it interpenetrates carbon or steel as water
interpenetrates a sponge, or ink a blotting pad. In fact, each
atom of "physical" matter--by which is meant matter in the first