Nor should we omit at least a passing notice of the humorous aspects of our Bag. Physiognomy will not go far in aiding us to determine as to a given letter, whether its contents are grave or gay. A well-ordered epistle, like a highly bred man, does not show on its face the emotions which it may contain. But in what we may call the lower class of letters, where nature is untrammeled by envelopes, and eccentricity or unskilfulness display themselves by the various shapes and styles in which the documents are folded and directed, there is more room for speculation on their internal character; and it is the author's intention to furnish some rare specimens of unconscious humor of this kind, for the delectation of his readers. As we contemplate the wit, fun, humor, and jollity of all sorts, which lie dormant within these wrappages, we are tempted to retract our commiseration for the imaginary official whom we have supposed to know the contents of the letters in his charge, and therefore drag out a miserable existence under their depressing influence. At least we feel impelled to modify our remarks so far as to say that in the case supposed, his days would be passed in alternate cachinnations and sympathizing grief. He would become a storehouse of wit, a magazine of humor. For there is much of wit, humor, and jollity running through these secret channels, that never is diffused through the medium of the press, but flows among the privacies of domestic circles, adding life to their intercourse, and increasing the attractions of social fellowship, like some sparkling stream, both refreshing and adorning the landscape through which it takes its course. We leave the further development of this prolific train of thought, to the reader's imagination. Yet the imagination can devise no combination more strange than those which may be found every day within the narrow precincts of which we have been speaking; and the same may be said of the Post-Office system at large, interwoven as it is with the whole social life of civilized man.