It is unnecessary here to touch upon the details of such an Academy. The proposition is by no means new. On the contrary, we believe a wish for some such change pretty generally exists. Iteration is sometimes more useful than originality. The more frequently the point is brought before the public, the more probable is it that steps will be taken by those who are qualified to move in such a matter. The more the present defective state of our scientific organization is commented on, the more likely is it to be remedied; for the patency of error is ever a sure prelude to its extirpation. CHRONICLES OF PARIS. THE RUE ST DENIS. One of the longest, the narrowest, the highest, the darkest, and the dirtiest streets of Paris, was, and is, and probably will long be, the Rue St Denis. Beginning at the bank of the Seine, and running due north, it spins out its length like a tape-worm, with every now and then a gentle wriggle, right across the capital, till it reaches the furthest barrier, and thence has a kind of suburban tail prolonged into the wide, straight road, a league in length, that stretches to the town of Sainct-Denys-en-France. This was, from time immemorial, the state-road for the monarchs of France to make their formal entries into, and exits from, their capital--whether they came from their coronation at Rheims, or went to their last resting-place beneath the tall spire of St Denis. This has always been the line by which travellers from the northern provinces have entered the good city of Paris; and for many a long year its echoes have never had rest from the cracking of the postilion's whip, the roll of the heavy diligence, and the perpetual jumbling of carts and waggons. It is, as it has ever been, one of the main arteries of the capital; and nowhere does the restless tide of Parisian life run more rapidly or more constantly than over its well-worn stones. In the pages of the venerable historians of the French capital, and in ancient maps, it is always called "_La Grande Rue de Sainct Denys_," being, no doubt, at one time the _ne plus ultra_ of all that was considered wide and commodious. Now its appellation is curtailed into the _Rue St D'nis_, and it is avoided by the polite inhabitants of Paris as containing nothing but the _bourgeoisie_ and the _canaille_. Once it was the Regent Street of Paris--a sort of Rue de la Paix--lounged along by the gallants of the days of Henri IV., and not unvisited by the red-heeled marquises of the Regent d'Orleans's time; now it sees nothing more _recherché_ than the cap of the grisette or the poissarde, as the case may be, nor any thing more august than the casquette of the _commis-voyageur_, or the indescribable shako and equipments of the National Guard. As its frequenters have been changed in character, so have its houses and public buildings; they have lost much of the picturesque appearance they possessed a hundred years ago--they are