etrate the drop of water, but
furnishes it with an envelope as the oxygen and hydrogen furnish
the drop of water with one.

Each physical atom is the centre of an etheric molecule composed
of many etheric atoms vibrating at a greater or lesser speed and
interpenetrating the atom. Each may be considered a miniature
earth, with its aerial envelope, the air, penetrating all parts
of it.

The etheric plane of matter not only unites with this prakritic
plane through the atom but it interpenetrates all combinations of
it; beside the atom as well as through the atom. The grain of
sand composed of many prakritic atoms is also composed of many
times that number of etheric atoms. The grain of sand is etheric
matter as well as prakritic matter. It exists on the etheric
plane exactly the same as it exists on the prakritic, and it has
etheric form as well as prakritic form.

As each atom of this physical world of ours--whether of land, or
water, or air; whether of solid, liquid or gas--is the centre
of an etheric molecule, we have two worlds, not one: a physical
world and an etheric one; a visible world and an invisible
world; a tangible world and an intangible world; a world of
effect and a world of cause.

And each animal, including man, is made in the same way. He has
a prakritic body and an etheric body; a visible body and an
invisible body; an earthly body and one "not made with hands,"
in common touch with the whole universe.

Chapter Four

What a Teacher Should Teach

Let us suppose that a certain wise teacher of physics places a
row of Bunsen burners under a long steel bar having a Daniell's
pyrometer at one end, and addresses his class (substantially) as
follows:

"At our last lecture we found that the matter of the universe
permeated all space, but in two conditions, which we agreed to
call physical and etheric, or tangible and intangible. It is all
the same matter, subject to the same laws, but differing in the
rate of vibration, the physical matter vibrating through one
great octave or plane, and the etheric vibrating through another
great octave or plane one degree higher--the chording vibration
of the matter of the two planes in one note producing what we
call energy or force, and with it phenomena.

"This is a bar of steel 36 inches long. It is composed of
physical atoms but no two physical atoms touch. Each physical
atom is as far apart from every other atom as the stars in heav