In this book Olin sets forth the teachings of the great phrenologists of the past, together with the latest and best ideas on the subject, in what is intended to be a simple, clear and interesting manner. So much has been written, and well written, about Phrenology that the author makes no claim to anything new or original. But while his task has been one mainly of selection from the works of Combe, Wells, Sizer, Hyde, and others, he has aimed to present the complete principles of the science in language which all can readily understand, and in a popular and instructive way.