He must also learn the art of
interrogating the medium and refrain from asking incoherent and
random questions about casual or future events. He will not
forget that "clairvoyance is strictly limited to the perception
of human personality," according to the role so well formulated
by Dr. Osty. Experiments have been made in which a psychometer,
on touching the tooth of a prehistoric animal, saw the landscapes
and the cataclysms of the earth's earliest ages displayed before
his eyes; in which another medium, on handling a jewel, conjured
up, it would seem with marvellous exactness, the games and
processions of ancient Greece, as though the objects permanently
retained the recollection or rediscovered the "astral negatives"
of all the events which they once witnessed. But it will be
understood that, in such cases, any effective control is, so to
speak, impossible and that the part played by telepathy cannot be
decided. It is important, therefore, to keep strictly to that
which can be verified.
Even when thus limiting his scope, the experimenter will meet
with many surprises. For instance, though the revelations of two
psychometers to whom the same letter is handed in succession most
often agree remarkably in their main outlines, it can also happen
that one of them perceives only what concerns the writer of the
letter, whereas the other will be interested only in the person
to whom the letter was addressed or to a third person who was in
the room where the letter was written.
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