My object in this treatise is to examine into the real nature of the Interest of Capital, for the purpose of proving that it is lawful, and explaining why it should be perpetual. This may appear singular, and yet, I confess, I am more afraid of being too plain than too obscure. I am afraid I may weary the reader by a series of mere truisms. But it is no easy matter to avoid this danger, when the facts with which we have to deal are known to every one by personal, familiar, and daily experience.