We could not select a greater contrast to the upright and unselfish patriot whom we have just spoken of, than the traitor Arnold, from whom there is a brief note, dated, "Crown Point, January 19, 1775," addressed to an officer under his command. The three lines of which it consists can prove bad spelling, erroneous grammar, and misplaced and superfluous punctuation; but, with all this complication of iniquity, the ruffian General contrives to express his meaning as briefly and clearly as if the rules of correct composition had been ever so scrupulously observed. This autograph, impressed with the foulest name in our history, has somewhat of the interest that would attach to a document on which a fiend-devoted wretch had signed away his salvation. But there was not substance enough in the man--a mere cross between the bull-dog and the fox--to justify much feeling of any sort about him personally. The interest, such as it is, attaches but little to the man, and far more to the circumstances amid which he acted, rendering the villainy almost sublime, which, exercised in petty affairs, would only have been vulgar. We turn another leaf, and find a memorial of Hamilton. It is but a letter of introduction, addressed to Governor Jay in favor of Mr. Davies, of Kentucky; but it gives an impression of high breeding and courtesy, as little to be mistaken as if we could see the writer's manner and hear his cultivated accents, while personally making one gentleman known to another. There is likewise a rare vigor of expression and pregnancy of meaning, such as only a man of habitual energy of thought could have conveyed into so commonplace a thing as an introductory letter. This autograph is a graceful one, with an easy and picturesque flourish beneath the signature, symbolical of a courteous bow at the conclusion of the social ceremony so admirably performed. Hamilton might well be the leader and idol of the Federalists; for he was pre-eminent in all the high qualities that characterized the great men of that party, and which should make even a Democrat feel proud that his country had produced such a noble old band of aristocrats; and he shared all the distrust of the people, which so inevitably and so righteously brought about their ruin. With his autograph we associate that of another Federalist, his friend in life; a man far narrower than Hamilton, but endowed with a native vigor, that caused many partisans to grapple to him for support; upright, sternly inflexible, and of a simplicity of manner that might have befitted the sturdiest republican among us. In our boyhood we used to see a thin, severe figure of an ancient mail, timeworn, but apparently indestructible, moving with a step of vigorous decay along the street, and knew him as "Old Tim Pickering."