The influence of metallic tractors on the human body, in removing various painful inflammatory diseases, such as rheumatism, pleurisy, some gouty affections, &c. &c: Lately discovered by Dr. Perkins, of North America; and demonstrated in a series of experiments and observations....by which the importance of the discovery is fully ascertained, and a new field of enquiry opened in the modern science of Galvanism, or animal electricity