Will you allow me to add a few words to this letter, already perhaps of undue extent. It has been my gratification during a life of some duration to have become personally acquainted with many eminent characters in the different walks of professional and literary avocation. I never knew an individual more thoroughly imbued with higher principles of action than Mr. Cooper: he acted upon principles, and fully comprehended the principles upon which he acted. Casual observers could scarcely, at times, understand and appreciate his motives or conduct. An independence of character worthy of the highest respect, and a natural boldness of temper which led him to a frank, emphatic, and intrepid utterance of his thoughts and sentiments, were uncongenial to that large class of people, who, from the want of moral courage, or a feeble physical temperament, habitually conform to public opinion, and endeavor to conciliate the world. Mr. Cooper was one of the most genuine Americans in his tone of mind, in manly self-reliance, in sympathy with the scenery, the history, and the constitution of his country, which it has ever been my lot to know. His genius was American, fresh, vigorous, independent, and devoted to native subjects. The opposition he met with on his return from Europe, in consequence of his patriotic, though, perhaps, injudicious attempts to point out the faults and duties of his countrymen, threw him reluctantly on the defensive, and sometimes gave an antagonistic manner to his intercourse; but, whoever, recognizing his intellectual superiority, and respecting his integrity of purpose, met him candidly, in an open, cordial and generous spirit, soon found in Mr. Cooper an honest man, and a thorough patriot. How strongly is impressed upon my memory his personal appearance, so often witnessed during his rambles in Broadway and amidst the haunts of this busy population. His phrenological development might challenge comparison with that of the most favored of mortals. His manly figure, high, prominent brow, clear and fine gray eye, and royal bearing, revealed the man of will and intelligence. His intellectual hardihood was remarkable. He worked upon a novel with the patient industry of a man of business, and set down every fact of costume, action, expression, local feature, and detail of maritime operations or woodland experience, with a kind of consciousness and precision that produced a Flemish exactitude of detail, while in portraying action, he seemed to catch by virtue of an eagle glance and an heroic temperament, the very spirit of his occasion and convey it to the reader's nerves and heart, as well as to his understanding. Herein Mr. Cooper was a man of unquestionable originality. As to his literary services, some idea may be formed of the consideration in which they are held by the almost countless editions of many of his works in his own country, and their circulation abroad by translations into almost every living tongue.