Correspondence files, ranging from complaints from subscribers of non-receipt of issues of the Sphinx to news and gossip of the magic world. Includes business correspondence (particularly concerning advertising), a few Wilson family letters, and a few letters concerning prescribing medications and other matters concerned with pharmacy and medical practice. Letters concerning the activities of the Society of American Magicians and its branches and other magicians' groups are also present. Major magicians represented include Howard Thurston, Harry Houdini, Clinton Burgess, F.W. Conradi, and others.