Everywhere exist these agents of custom and convention, wielded by a power behind them, and holding long no one direction, but varying in every wind. Some breeze of general policy, however, prescribes the law of these alterations, while only a weak and brainless sensibility, blowing from every source, commonly occasions the continual veering of our private word. Through what manifold phases _a good conversationist_ has dexterity to pass! Quarterings of the uncertain moon, the lights that glance blue, silver, yellow, and green from the shifting angles of the gems that move with their wearers, or the confused motions of some of our inferior fellow-creatures that flutter from side to side of the road as intimidating objects fail on the eyes planted on opposite sides of their heads, feebly symbolize these human displays of unstable equilibrium. We must adapt our method to circumstances; but the apostolic rule, of "All things to all men," should not touch, as in Paul it never did, the fundamental consistency of principle which is the chief sign of spiritual life. The degree of elevation in the scale of being is marked by the approximation of the sight to a focus of unity. But, judging from the pictures they give us of their interior states, we might think many of our rational companions as myriad-eyed as naturalists tell us are some insects. Behold the wondrous transformation undergone by those very looks and features that give the natural language, as sentiments contrary to each other are successively presented, and Republican or Democrat, Pro-Slavery man or Abolitionist, walks up! In truth, a man at once kindly and ingenuous can hardly help in most assemblies coming continually to grief. He knows not what to do, to be at once frank and polite. The transverse beams of the cross on which he is crucified are made of the sincerity and amiability which in no company can he quite reconcile. Happy is he who has discovered beneath all pleasant humors the unity at bottom of candor with goodness, in an Apostle's clause, "speaking the truth in love"! No rare and beautiful monster could stir more surprise and curiosity. It is but shifting the scene from a domestic dwelling to a concert-hall to notice how much sympathetic lying is in all applause. We saw a young man vigorously clap the performance to which he had not listened, and, when the _encore_ took effect, return immediately to his noisy and disturbing engrossment in the young ladies' society from whose impertinent whispering he had only rested for the moment, troubling all who sat near him both with his talk and his sympathetic lie. A true man will not move a finger or lisp a syllable to echo what he does not apprehend and approve. A true man never assents anywise to what is error to him. In the delicious letters of Mendelssohn we read of an application by a distinguished lady made to him to write a piece of music to accompany the somewhat famous lines known as "Napoleon's Midnight Review." The