He may also try the experiment of having a friend hold a certain number
of small buttons, etc., in his hand, and endeavor to _will_ that the
student shall "guess" the right number. Some people attain a surprising
proficiency in this work, almost from the first. A similar experiment
with the pack of cards, the student endeavoring to "guess" the card
drawn from the pack, naming color, suit, and number in turn, may afford
successful results. A number of these experiments may be thought of by
an ingenious person, remembering always that the "guess" is not a guess
at all, but an attempt to register the mental impression of the
Transmitter.