Main object of this book is to provide an introduction to electrochemistry in its present development. An attempt has been made to explain the fundamentals of the subject as it stands today, it is hoped that the reader will acquire the modern point of view in electrochemistry without being burdened by much that is obsolete the ideas have been incorporated into the structure of the book, with consequent simplification and clarification in the treatment of many aspects of electrochemistry. The Electrochemistry of Solutions is comprehensive and in giving detail. The present book is more suited to the needs of students of physical chemistry and to those of chemists and physicists whose work brings them in contact with a variety of electrochemical problems. As the title implies, the book should also serve as an introductory text for those who in tend to specialize in either the theoretical or practical applications of electrochemistry.