Chapter I: AN ESSAY ON ELECTRICITY, explaining clearly and fuly the principles

of that useful Science, describing the various Instruments that have been contrived either to illustrate the Theory, or render the Practice of it entertaining. The different Modes in which the Electrical Fluid may be applied to the human Frame for medical Purposes, are distinctly and clearly pointed out, and the necessary Apparatus explained. To which is now added, A LETTER to the AUTHOR, from Mr. JOHN BIRCH, Surgeon, on the Subject of MEDICAL ELECTRICITY. _Fourth Edition_, 8vo. Price 6s. illustrated with six Plates.