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.

"A Treatise on Electricity" by Francis Penrose is an 18th-century publication examining the mysteries of electricity and its possible uses in medicine. In this book, the author, who happens to be a surgeon, mixes scientific study with hands-on applications, particularly investigating the healing potential of electricity. Penrose suggests that air particles creating friction explain electricity, and he offers experiments showing the connection between air, that same friction, and gravity. Furthermore, the medical doctor explores the impact of electrical forces on animal and human life, and the use of electricity to help or hurt in the healing process. Overall, Penrose's study combines experimentation and philosophical thinking about energy, gravity, and light.