The book "A treatise on electricity, in which various phenomena are explained, and the cause of the attraction and gravitation of solid bodies. To which is added a brief description of how the electric ethers affect the human body and in what disorders" was written by Francis Penrose, a 19th century explorer and scientist . In this important work, the author examines the nature of electricity in detail, trying to explain its main phenomena and regularities. It reveals the connection between electrical phenomena and the attraction and gravity between material bodies, as well as the manifestation of electrical influence on the human body and the possible consequences of this influence on health. This book will be useful both for specialists in the field of physics and medicine, and for a wide range of readers who are interested in the nature of electrical phenomena.