For this trick a whole set of dominoes is required, the performer
taking care to hide one of the set, not a double, in his pocket. The
remaining dominoes should be shuffled, and placed according to the
ordinary rules of domino games, and the performer undertakes to tell,
without seeing them, the two numbers forming the extremes of the line,
set during his absence from the room. The numbers on the extreme ends
of the domino line will be exactly the same as the numbers on the
domino which the performer has in his pocket. If he is asked to repeat
the trick, he should be sure to change the hidden domino, or he may
chance to be found out.
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