We are the contemporaries of a street-building generation, but the grand maxim of the nineteenth century, in their management of masonry, as in almost every thing else, as far as we can discover, appears to lie in that troublesome line of Macbeth's soliloquy, ending with, "'twere well it were done quickly." It is notorious that many of the leases of new dwelling-houses contain a clause against dancing, lest the premises should suffer from a mazurka, tremble at a gallopade, or fall prostrate under the inflictions of "the parson's farewell," or "the wind that shakes the barley." The system of building, or rather "running up" a house first, and afterwards providing it with a false exterior, meant to deceive the eye with the semblance of curved stone, is in itself an absolute abomination. Besides, Greek architecture, so magnificent when on a large scale, becomes perfectly ridiculous when applied to a private street-mansion, or a haberdasher's warehouse. St. Paul's Church, Covent-Garden, is an instance of the unhappy effect produced by a combination of a similar kind; great in all its parts, with its original littleness, it very nearly approximates to the character of a barn. Inigo Jones doubtless desired to erect an edifice of stately Roman aspect, but he was cramped in his design, and, therefore, only aspired to make a first-rate barn; so far unquestionably the great architect has succeeded. Then looking to those details of London architecture, which appear more peculiarly connected with the dignity of the nation, what can we say of it, but that the King of Great Britain is worse lodged than the chief magistrate of Claris or Zug, while the debates of the most powerful assembly in the world are carried on in a building, (or, a return to Westminster Hall,) which will bear no comparison with the Stadthouse at Amsterdam! The city, however, as a whole, presents a combination of magnitude and grandeur, which we should in vain look for elsewhere, although with all its immensity it has not yet realized the quaint prediction of James the First,--that London would shortly be England, and England would be London. _Morning_.