THE CONJURER'S POST OFFICE.
A letter being folded up and put in a box, it vanishes. In its stead is
found an envelope containing, not the original writing, but an apt
reply.
Explanation.—One side of the box is double, and works
on a hinge in the lower edge. The double is folded up against the side,
so as to enclose and conceal the duplicate envelope, with its
appropriate answer. When the letter is put in the false side falls down
upon it, and covers it from sight, and the answer is alone found. The
box is useful for many similar tricks.
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