raphy. On this hypothesis it is supposed
that it is due to ethereal wave action:--Thought causes motion in the
brain cells of the agent, the cells then impart motion to the
surrounding ether in the form of waves which impinge on the brain cells
of the percipient and give rise to a corresponding thought to that which
started the ethereal wave motion.

This theory offers great difficulties. An opponent to it points out that
"A wireless message is transmitted by a succession of single ethereal
wave impulses produced by the electric sparks at the starting station
and received by the coherer at the receiving station, whereas a diagram
to be transmitted would require a number of brain-waves produced
simultaneously and arranged in the form of the diagram."

Another mode of putting the matter recently advanced is that the agent
does not transmit his thought, but that the percipient reads
clairvoyantly what is in the agent's mind.

There is also the spiritualistic theory. It is asserted that an external
entity, or spirit, conveys the images or thoughts from one mind to
another.

Another theory is that telepathy takes place in the subconscious mind,
and that the subconscious mind of the agent is in communication with
the subconscious mind of the percipient by means of the universal mind
underlying all things and of which individual subconscious minds form
part.

Not one of these theories has been accepted as proved by the Society for
Psychical Research. In cases of spontaneous telepathy it is now
generally believed that the appearance of a person at the time of death
or at a crisis is not caused by an objective bodily ghost, but arises
from a telepathic impact from the agent formulating itself into his
image in the mind of the percipient.

In the case of two persons seeing an apparition at the same time, this
may be due to the two percipients receiving each, separately, a
telepathic impression, or there may be only one percipient who
telepathically impresses the hallucination on the mind of the second
person.

I will now proceed to relate some cases of telepathy which have come
under my personal observation. My first experiment in the transmission
of images of drawings and diagrams took place in the rooms of the
Society for Psychical Research in May 1902. A private lady, Miss M.
Telbin, acted as percipient, and I acted as agent. There were present at
the time Mr. J. G. Piddington, Honorary Secretary of the Society, and