This work, like its little predecessor from the same pen, has been adapted exclusively to the use of DR. JEROME KIDDER'S Electro-Magnetic Machine, manufactured and sold, at present, at No. 544 Broadway, New York; because the author, having used in his own practice a considerable variety of the most popular machines intended for therapeutic purposes, and having examined several others, believes this to be incomparably _the best in use_. Dr. Kidder has, with most laudable zeal, pressed on his researches and improvements in the manufacture of these instruments, until there seems to be scarcely anything more in them to be desired. They are certainly not equalled by any others in America, and probably not surpassed, if equalled, by any in the world. D. C. PLAINFIELD, ILL., June, 1869. CONTENTS. Page. INTRODUCTION xi FIRST PRINCIPLES. DR. JEROME KIDDER'S ELECTRO-MAGNETIC MACHINE 21 POLARIZATION 26 THE ELECTRIC CIRCUIT 28 POLARIZATION OF THE CIRCUIT 29 THE CENTRAL POINT OF THE CIRCUIT 33 THE CURRENT 35 MODIFICATIONS OF ELECTRICITY 36 THE VITAL FORCES--ANIMAL AND VEGETABLE 37 EXTENT OF ELECTRIC AGENCY 42 THEORY OF MAN 44 THE LOWER ANIMALS 54 THE VEGETABLE KINGDOM 56 NATURAL POLARIZATION OF MAN'S PHYSICAL ORGANISM 56 ELECTRICAL CLASSIFICATION OF DISEASES 58 PHILOSOPHY OF DISEASE AND CURE 58 PRINCIPLES OF PRACTICE. POLAR ANTAGONISM 61 IMPORTANCE OF NOTING THE CENTRAL POINT 62 DISTINCTIVE USE OF EACH POLE 63 USE OF THE LONG CORD 69 THE INWARD AND THE OUTWARD CURRENT 74 MECHANICAL EFFECT OF EACH POLE 75 RELAXED AND ATROPHIED CONDITIONS 77 GENERAL DIRECTION OF THE CURRENT 78 TREATING WITH ELECTROLYTIC CURRENTS 79 POSITIVE AND NEGATIVE MANIFESTATIONS 81 HEALING 84 DIAGNOSIS 84 PRESCRIPTIONS.