Harry Kahne developed this course of Multiple Mentality exercise based on manipulations of the alphabet. In the 1920s he was billed as the Incomparable Mentalist and The Man with the Multiple Mind. He dmeonstrated his ability by doing 6 different mental operations simultaneously, actually involving 14 distinct operations (hearing, memory, reading, transposing, writing backwards and upside down, adding and dividing, proofing, talking, walking, etc. Here is the system Kahne left as his legacy; a series of exercises leading to the development of greater mental power. The system works.
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