That to biographical writings we are indebted for the greatest and best field in which to study mankind, or human nature, is a fact duly appreciated by a well-informed community. In them we can trace the effects of mental operations to their proper sources, and by comparing our own composition with that of those who have excelled in virtue, or with that of those who have been sunk in the lowest depths of folly and vice, we are enabled to select a plan of life that will at least afford self-satisfaction, and guide us through the world in paths of morality