When one stands before the great Byzantine Church of the _Sacre Coeur_, that holds aloft its white domes against the sky up above Paris on the hill of Montmartre, and looks down on the multiplicity of roofs, there is always a film of smoke obscuring detail and softening the outlines of some portions of the city. Yet when one walks through the streets the clean creamy whiteness of the buildings would almost give the stranger the impression that he had reached a city that had no use for coal. Even in the older streets where renovation and repairs are very infrequent there is never a suspicion of that uniform greyness that the big cities of Britain produce. In all the great boulevards in the whole of the Etoile district and wherever the houses are well built and of modern construction, the bright clean stone-work is so free from the effects of smoke that a Dutch housewife would fail to see the need for external cleaning. The facades of nearly all the houses in the newly reconstructed streets have a certain monotony about them which has been inherited from the days of Hausmann's great rebuilding. There is seldom any colour except in the windows of shops, for the universal shutters, which in Italy are brilliantly painted bright green, brown, blue, or even pink, are here uniformly white or the palest of greys. So many of the new streets are, however, planted with trees that the colour scheme resolves itself into green and pale cream, except in winter, when the blackish stems of the trees add nothing to the gaiety of the streets. Contrasting the streets in the neighbourhood of the Parc Monceaux with those of Mayfair, London has the advantage for variety of architectural styles and for complete changes of atmosphere; but for spacious splendour, for what can properly be termed elegance, Paris stands on a vastly higher plane. The dreary stucco pomposity of Kensington and Belgravia fortunately cannot be discovered in Paris, and it is well for the world that few cities indulged in this architectural make-believe. While Belgravia can only keep her self-respect by continually covering herself with fresh coats of paint, the honest stone-work of Paris lets the years pass without showing any appreciable signs of deterioration. Unlike London, where there are seemingly endless streets of two and three storeys, Paris has developed the tall building of five or six floors. The girdle of fortification has no doubt directed this tendency. Where the streets are not wide the lofty houses increase the effect of narrowness, and many of the side streets in the St. Antoine district have, with their innumerable shutters, a very close resemblance to some Italian cities.