Our limits will enable us to glance at only one more of the prominent faults of this book. We refer to Mr. Bulwer's ideas on duelling. What do our readers think of such sophistry as this: 'There are some cases in which human nature and its deep wrongs will be ever stronger than the world and its philosophy. Duels and wars belong to the same principle; both are sinful on light grounds and poor pretexts. But it is not sinful for a soldier to defend his country from invasion, nor for a man, with a man's heart, to vindicate truth and honor with his life. The robber that asks me for money, I am allowed to shoot. Is the robber that tears from me treasures never to be replaced, to go free?' Again: 'As in revolutions all law is suspended, so are there stormy events and mighty injuries in life, which are as revolutions to individuals.' It follows, of course, that a revolution may take place 'in the little kingdom man,' whenever his majesty sees fit. It is unnecessary to show up the monstrosity of such politics, and of that morality which, guided alone by worldly philosophy, makes it sometimes sinful, and sometimes not, to take the life of a fellow being. There are men enough in the world who will fight as they judge expedient; but Mr. Bulwer is the only one who has had the hardihood to defend the practice, as sometimes under the sanction of omnipotence. We had some remarks to make on the sudden transitions of character, as delineated by our author, which strike us as exceedingly unnatural. But we have already transcended our space, and only record an impression here, which must be apparent to every reader. On the appearance of the sequel to Ernest Maltravers, we may examine this fault at leisure. * * * * * MEMOIRS OF AARON BURR. With Miscellaneous Selections from his Correspondence. By MATTHEW L. DAVIS. In two volumes. Volume Two. pp. 449. New-York: HARPER AND BROTHERS.