“ Although the details of animal magnetism may sound absurd (and even morally dubious) to modern ears, within its context Mesmerism was very much in line with the latest scientific developments. In some ways, exciting experiments with invisible forces — gravity, electricity, magnetism, wondrous gases like hydrogen — defined the era. Unlike the occultists of the previous ages, Mesmer was striving to give his practices a rational scientific as opposed to a religious flavour. Indeed, although the magnetic fluid part did not work out, in an important sense, animal magnetism marked the beginnings of hypnosis and psychological suggestion. These are very real and possibly still clinically useful phenomena, as a recent resurgence in research shows.”
https://publicdomainreview.org/essay/mesmerising-science-the-franklin-commission-and-the-modern-clinical-trial