Alfred Binet Charles F R

Animal magnetism, also known as mesmerism, was a theory developed by Franz Mesmer in the 18th century, suggesting an invisible natural force possessed by all living things that could influence physical effects, including healing. This vitalist theory gained significant traction across Europe and the United States, influencing medical practices for decades and inspiring numerous publications. Practitioners were often called "magnetizers," and the practice was sometimes contrasted with "mesmerism" and later "hypnotism," terms that evolved as the theory was studied and debated.

Investigations into animal magnetism by royal commissions in France during the late 18th century, and later by the Royal Academy of Medicine, yielded mixed results. While acknowledging reported cures, these commissions often attributed the effects to imagination or suggestion rather than a verifiable "magnetic fluid." The distinction between mesmerism and hypnotism became more pronounced with figures like Abbé Faria, who emphasized the subject's internal state, and James Braid, who coined "hypnotism" and proposed a more physiological explanation. Despite its eventual decline as a mainstream practice, animal magnetism left a lasting influence on alternative medicine and related philosophical discussions.

Franz Mesmer's 18th-century theory of animal magnetism, or "Lebensmagnetismus," proposed an invisible natural force inherent in all living beings, capable of producing physical effects, including therapeutic ones. Practitioners, often termed "magnetizers," aimed to manipulate this "magnetic fluid" to influence others, with reported effects ranging from heat and trembling to trances. The practice attracted considerable attention and was influential in medicine for a significant period. However, the underlying theory was met with skepticism. Early investigations, such as those by French royal commissions in the late 1700s, concluded that while cures might occur, they were likely due to the patient's imagination or deception, rather than any demonstrable magnetic force.

Over time, the terminology surrounding animal magnetism evolved, leading to distinctions between "magnetizer," "mesmerist," and "hypnotist." Some practitioners, particularly in Britain, began referring to their techniques as "mesmerism" to distance themselves from Mesmer's original "magnetic fluid" theory, focusing instead on the clinical effects. Later, figures like Abbé Faria suggested that the phenomena were primarily due to the subject's internal state and the power of suggestion, rather than an external force. James Braid further distinguished his work by coining the term "hypnotism," emphasizing a "peculiar condition of the nervous system" induced artificially, aligning it with physiological principles and differentiating it from what he saw as the more metaphysical aspects of mesmerism.

A subsequent investigation by the Royal Academy of Medicine in Paris in 1826 focused on the observable effects and clinical potential of mesmeric procedures, deliberately setting aside the question of a physical fluid. Their experiments, conducted with greater control and on individuals rather than groups, yielded different observations than earlier reports. While the specific mechanisms remained debated, the study of animal magnetism spurred the formation of societies dedicated to its practice and study. Despite its eventual marginalization from mainstream science and medicine, the concepts explored within animal magnetism and mesmerism continued to influence alternative healing practices and discussions about consciousness and suggestion.