The principal apparatus for receiving thought
vibrations of this kind is that which is known as the "pineal gland,"
which I shall now describe.

The pineal gland is a peculiar mass of nervous substance which is embedded
in the human brain, in a position near the middle of the skull almost
directly above the extreme top of the spinal column. It is shaped like a
small cone; and is of a reddish-gray color. It lies in front of the
cerebellum, and is attached to the floor of the third ventricle of the
brain. It contains a small quantity of peculiar particles of gritty,
sand-like substance, which are sometimes called "brain-sand." It derives
its scientific name from its shape, which, as I have said, resembles a
pine-cone. Physiologists are at sea regarding the function of this strange
organ, and generally content themselves with the statement that "its
functions are not understood." But occultists know that the pineal gland,
with its peculiar arrangement of nerve-cell corpuscles, and its tiny
grains of "brain-sand," is the physical telepathic receiving instrument.
Students of wireless telegraphy have noticed a startling resemblance
between the pineal gland and a part of the receiving instrument employed
in wireless telegraphy.

The thought vibrations coming in contact with the nervous system of the
receiving person, set up a peculiar vibration in the substance of the
pineal gland and thus the first step in the transformation of these
vibrations into thought-forms in the mind of the person is under way. The
remainder of the process is too technical, both in the physiological as
well as in the occult sense, to be taken up in detail at this place. The
student will do well to get the idea of the workings of wireless
telegraphy well fixed in his mind, for this will set up the right
conception of the working of ordinary telepathy, without the necessity of
complicated technical diagrams and descriptions.

And, now then, let us see what results from the sending forth and
receiving of these mental and emotional waves of force and energy. It is a
most interesting subject, I assure you. While the phenomena of the astral
plane is probably more fascinating to the average student, I would impress
upon you the importance of mastering the occult phenomena of the physical
plane, before passing on to that of the higher planes.

In the first place, as all occultists know, each person is constantly
surrounded with what has been called an "atm