I may add that I have endeavoured, as was said by a deceased physician, “to paint electro-therapeutics not imperfectly, but, as it were, in miniature:” and that while I have carefully revised every page, and have noticed all real improvements introduced to the profession since the First Edition, I have kept the book a small book: and I venture to hope a book easily to be understanded by the multitude of practitioners who ask daily what instruments to use, and when, and especially how, to use them. These questions I have endeavoured to answer in the following pages, which contain such details, and such details only, as I believe it essential for the practitioner to master. 68, WIMPOLE STREET, W. _December, 1885_. CONTENTS. NOTE TO THE THIRD EDITION. LECTURE I. ELECTRICAL INSTRUMENTS. PRELIMINARY REMARKS. THE DIFFERENT VARIETIES OF ELECTRICITY. 1. FRANKLINISM. Method of Generating. The Plate Machine. Winter’s Machine. Carré’s Machine. The “Bischoff” Gas Engine. The “Hand Fly-Wheel.” Accessories Required. Its Administration. (_a_) Electro-Positive Bath. (_b_) Electro-Negative Bath. (_c_) by Sparks. 2. VOLTAISM. Points of Distinction between the Voltaic and Faradaic Currents. The Essentials of a Voltaic Battery. The 40-Cell Battery. The Galvanometer as an aid to the Dosage of Electricity. 3. FARADISM. The Essentials of a Faradaic Instrument. Description of a Faradaic Instrument. The Combined Hospital Battery. THE ACCESSORIES OF ELECTRICAL APPARATUS. LECTURE II. METHODS OF APPLYING ELECTRICITY. RÉSUMÉ OF FIRST LECTURE. GENERALIZED ELECTRIZATION. The Positive Charge. The Electric Bath. General Faradization. Central Galvanization. LOCALIZED VOLTAIZATION AND LOCALIZED FARADIZATION. Direct Muscular Electrization. Indirect ” ” Different kinds of Rheophores. Importance of exactitude in administering a Constant Current. CUTANEOUS ELECTRIZATION. (_a_) The Electric Hand. (_b_) Metallic Conductors. (_c_) The Wire Brush. ELECTRIZATION OF INTERNAL ORGANS. (_a_) of Rectum and Muscles of Anus. (_b_) of Bladder. (_c_) of Uterus. (_d_) of Larynx. (_e_) of Male Genitals. ELECTRIZATION OF CENTRAL ORGANS OF NERVOUS SYSTEM. (_a_) of the Brain. (_b_) of the Sympathetic. (_c_) of the Spinal Cord. (_d_) of the Retina. (_e_) of the Auditory Nerve. PRECAUTIONS TO BE OBSERVED IN ALL MEDICAL APPLICATIONS OF ELECTRICITY. LECTURE III. ELECTRICITY IN DIAGNOSIS AND TREATMENT. A.--_Electricity in Diagnosis._ LIMITATION OF ELECTRICITY IN DIAGNOSIS. METHOD OF TESTING FARADO-IRRITABILITY. ” VOLTAO-IRRITABILITY. RULE FOR STRENGTH OF CURRENT.