The book has an active table of contents for readers to access each chapter. Spencer�s theory inspired Andrew Carnegie and William Graham Sumner's visions of unbridled and unrepentant capitalism of the United States in late nineteenth-century. Carnegie interpreted Spencer's social theory as justifying merciless economic competition. Spencer's reputation was not recovered for many years from the interpretative caricatures of many scholars, thus marginalizing him to the hinterlands of intellectual history. Fortunately, recent scholarship has begun restoring and repairing his legacy and theory. Hebert Spencer famously coined the famous expression �survival of the fittest�. However, he is also a powerful thinker about sociology. His competence of building an advanced scheme of Sociology rests upon the various preparatory stages in a series of treatises such Psychology and Economics. Spencer made his expositions point in this book to Sociology. This is a must read book for readers who are interested in studying Spencer�s Sociology.