This classic, written in 1903, explores the mysterious subject of hypnotism. The writer explores the modern understanding of the nature, uses, and dangers of the techniques used in hypnosis. This remarkable way to explore the human mind only became more accepted in the mid to late nineteenth century, though it has been practiced for millennia. It possibly originated in India or Egypt and may be related to some yoga and meditation practices. This book gives some fascinating insight into a mystery, that over a century later, we still don't fully understand.