We know the sublime Perpetual President in his red wig, and sublime supremacy of Pure Science. A gloomy set figure; affecting the sententious, the emphatic and a composed impregnability,--like the Jove of Science. With immensities of gloomy vanity, not compressible at all times. Friedrich always strove to honor his Perpetual President, and duly adore the Pure Sciences in him; but inwardly could not quite manage it, though outwardly he failed in nothing. Impartial witnesses confess, the King had a great deal of trouble with his gloomings and him. "Who is this Voltaire?" gloomily thinks the Perpetual President to himself. "A fellow with a nimble tongue, that is all. Knows nothing whatever of Pure Sciences, except what fraction or tincture he has begged or stolen from myself. And here is the King of the world in raptures with him!" Voltaire from of old had faithfully done his kowtows to this King of the Sciences; and, with a sort of terror, had suffered with incredible patience a great deal from him. But there comes an end to all things; Voltaire's patience not excepted. It lay in the fates that Maupertuis should steadily accumulate, day after day, and now more than ever heretofore, upon the sensitive Voltaire. Till, as will be seen, the sensitive Voltaire could endure it no longer; but had to explode upon this big Bully (accident lending a spark); to go off like a Vesuvius of crackers, fire-serpents and sky-rockets; envelop the red wig, and much else, in delirious conflagration;--and produce the catastrophe of this Berlin Drama. D'Argens, poor dissolute creature, is the best of the French lot. He has married, after so many temporary marriages with Actresses, one Actress in permanence, Mamsell Cochois, a patient kind being; and settled now, at Potsdam here, into perfectly composed household life. Really loves Friedrich, they say; the only Frenchman of them that does. Has abundance of light sputtery wit, and Provencal fire and ingenuity; no ill-nature against any man. Never injures anybody, nor lies at all about anything. A great friend of fine weather; regrets, of his inheritances in Provence, chiefly one item, and this not overmuch,--the bright southern sun. Sits shivering in winter-time, wrapping himself in more and more flannel, two dressing-gowns, two nightcaps:--loyal to this King, in good times and in evil.