In 1766 he published a doctoral dissertation with the Latin title De planetarum influxu in corpus humanum (On the Influence of the Planets on the Human Body), which discussed the influence of the Moon and the planets on the human body and on disease.
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To cure an insane person, for example, involved causing a fit of madness.
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This reflected a new-found interest in spiritualism, to which her parents had turned in the early 1850s, as did her book Pioneers of the Spiritual Reformation (1883), which consisted of biographical sketches of the German poet Justinus Kerner and of her father William Howitt, but whose other purpose was to promote spiritualism, mesmerism and similar phenomena.