A Treatise on Electricity
 Wherein its various phænomena are accounted for, and the cause of the attraction and gravitation of solids, assigned. To which is added, a short account, how the electrical effluvia act upon the animal frame, and in what disorders the same may probably be applied with success, and in what not.

by Francis Penrose

"A Treatise on Electricity" by Francis Penrose is a scientific publication written in the 18th century. This treatise examines various electrical phenomena and explores their potential applications in medicine and healing. The author, a surgeon, seeks to blend scientific inquiry with practical applications, suggesting how electricity might be harnessed for therapeutic purposes. In this work, Penrose investigates the nature of electricity, proposing that it results from the friction and agitation of air particles. He presents a series of experiments to demonstrate how air and light are intricately linked and examines the implications of these findings for understanding gravity and the attraction between solid bodies. The treatise also discusses the effects of electrical forces on the human body, asserting that while electricity can facilitate healing in certain conditions, care must be taken not to apply it indiscriminately, especially in cases involving weakened nerves. Penrose's observations reflect the scientific curiosity of the time, as he attempts to reconcile empirical findings with philosophical reflections on the nature of matter and energy.