This book is a collection of letters written by Harriet Martineau on the subject of mesmerism, a popular form of hypnotism in the 19th century. Martineau, one of the era's most prominent writers and social commentators, offers a skeptical and critical perspective on the practice of mesmerism. With its insightful analysis of a forgotten form of therapy, this book is a fascinating glimpse into the world of 19th-century medicine and psychology.

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