In issuing this volume of my mathematical puzzles, of which some have appeared in periodicals and others are given here for the first time, I must acknowledge the encouragement that I have received from many unknown correspondents, at home and abroad, who have expressed a desire to have the problems in a collected form, with some of the solutions given at greater length than is possible in magazines and newspapers. Though I have included a few old puzzles that have intrested the world for generations, where I felt that there was something new to be said about them, the problems are in the main original. It is true that some of these have that the reader may be glad to know their source.
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