Some of these alleys, on one side at least, have also the charm, which is the rarest thing in town, of a certain steepness in incline. They dip as they waver, with a motion that tells of a direction towards water. Whether in village or town there is sea or river, a hidden Mediterranean or a hidden Thames, at the level to which the sway and swing of the path will settle. And throughout London the direction of streets seems to be a rather secret thing, and misleading--the sign of a town that has not been ordered as a machine is ordered, but has felt its way like an organism. Slight tendencies, convergences, divergences, lead the streets wandering and draw lines long astray. Old and forgotten causes have brought to pass the slight misgoing that first takes the streets apart--old rights or the accidents of private liberty; and what these began the chances of sequence have ended, a mile astray. Doubtless, besides, the swing of the river has tended to set streets a-flowing too. But the downward fluctuation of little City streets towards the water is a briefer thing, and as full of drawing as the upper line of a flexible fan foreshortened. The long straying streets are too vague for drawing. In these City lanes, too, there is some rest for the eyes from the infinite detail of the street, and even from the tyranny of windows. Only in their warehouses are to be found spaces of plain wall, but unluckily the plain wall is also black. [Illustration: END OF A WINTER DAY.] [Illustration: _The Embankment at Night._] THE CLIMATE OF SMOKE