My investigations cover nearly twenty years of a busy professional career. Every hour which I could spare from my professional work was given over to study in libraries, to interviews with retired magicians and collectors, and to browsing in old bookstores and antique shops where rare collections of programs, newspapers, and prints might be found.

In order to conduct my researches intelligently, I was compelled to pick up a smattering of the language of each country in which I played. The average collector or proprietor of an old bookshop is a canny, suspicious individual who must accept you as a friend before he will uncover his choicest treasures.

As authorities, books on magic and kindred arts are practically worthless. The earliest books, like the magician stories written by Sir John Mandeville in 1356, read like prototypes of to-day’s dime novels. They are thrilling tales of travellers who witnessed magical performances, but they are not authentic records of performers and their work.

One of the oldest books in my collection is “Natural and Unnatural Magic” by Gantziony, dated 1489. It is the author’s script, exquisite in its German chirography, artistic in its illuminated illustrations, but worthless as an historical record, though many of the writer’s descriptions and explanations of old-time tricks are most interesting.

Early in the seventeenth century appeared “Hocus Pocus,” the most widely copied book in the literature of magic. The second edition, dated 1635, I have in my library. I have never been able to find a copy of the first edition or to ascertain the date at which it was published.

A few years later, in 1658, came a very important contribution to the history of magic in “Natural Magick in XX. Bookes,” by John Baptist Porta, a Neapolitan. This has been translated into nearly every language. It was the first really important and exhaustive work on the subject, but, unfortunately, it gives the explanation of tricks, rather than an authentic record of their invention.

In 1682, Simon Witgeest of Amsterdam, Holland, wrote an admirable work, whose title reads “Book of Natural Magic.” This work was translated into German, ran through many an edition, and had an enormous sale in both Holland and Germany.