Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The writer, in his progress through the mill, has Often felt that such a work as this would have been of great value, and some one principle here demonstrated been worth many times the cost of the book. It is believed, therefore, that this book will commend itself to those interested, for the reason that it is cheap, that it is plain and easily understood, and that it is useful.