Long since, you urged me to attempt a fiction which might borrow its characters from our own Records, and serve to illustrate some of those truths which History is too often compelled to leave to the Tale-teller, the Dramatist, and the Poet.  Unquestionably, Fiction, when aspiring to something higher than mere romance, does not pervert, but elucidate Facts.  He who employs it worthily must, like a biographer, study the time and the characters he selects, with a minute and earnest diligence which the general historian, whose range extends over centuries, can scarcely be expected to bestow upon the things and the men of a single epoch.  His descriptions should fill up with colour and detail the cold outlines of the rapid chronicler; and in spite of all that has been argued by pseudo-critics, the very fancy which urged and animated his theme should necessarily tend to increase the reader's practical and familiar acquaintance with the habits, the motives, and the modes of thought which constitute the true idiosyncrasy of an age.  More than all, to Fiction is permitted that liberal use of Analogical Hypothesis which is denied to History, and which, if sobered by research, and enlightened by that knowledge of mankind (without which Fiction can neither harm nor profit, for it becomes unreadable), tends to clear up much that were otherwise obscure, and to solve the disputes and difficulties of contradictory evidence by the philosophy of the human heart.