My visit fell at a most favorable juncture as to weather, there being but few rainy days and but little fog. I had imagined that they had barely enough fair weather in London, at any season, to keep alive the tradition of sunshine and of blue sky, but the October days I spent there were not so very far behind what we have at home at this season. London often puts on a nightcap of smoke and fog, which it pulls down over its ears pretty close at times; and the sun has a habit of lying abed very late in the morning, which all the people imitate; but I remember some very pleasant weather there, and some bright moonlight nights. I saw but one full-blown characteristic London fog. I was in the National Gallery one day, trying to make up my mind about Turner, when this chimney-pot meteor came down. It was like a great yellow dog taking possession of the world. The light faded from the room, the pictures ran together in confused masses of shadow on the walls, and in the street only a dim yellowish twilight prevailed, through which faintly twinkled the lights in the shop windows. Vehicles came slowly out of the dirty obscurity on one side and plunged into it on the other. Waterloo Bridge gave one or two leaps and disappeared, and the Nelson Column in Trafalgar Square was obliterated for half its length. Travel was impeded, boats stopped on the river, trains stood still on the track, and for an hour and a half London lay buried beneath this sickening eruption. I say eruption, because a London fog is only a London smoke tempered by a moist atmosphere. It is called "fog" by courtesy, but lampblack is its chief ingredient. It is not wet like our fogs, but quite dry, and makes the eyes smart and the nose tingle. Whenever the sun can be seen through it, his face is red and dirty; seen through a bona fide fog, his face is clean and white. English coal--or "coals," as they say here--in burning gives out an enormous quantity of thick, yellowish smoke, which is at no time absorbed or dissipated as it would be in our hard, dry atmosphere, and which at certain times is not absorbed at all, but falls down swollen and augmented by the prevailing moisture. The atmosphere of the whole island is more or less impregnated with smoke, even on the fairest days, and it becomes more and more dense as you approach the great towns. Yet this compound of smut, fog, and common air is an elixir of youth; and this is one of the surprises of London, to see amid so much soot and dinginess such fresh, blooming complexions, and in general such a fine physical tone and full-bloodedness among the people,--such as one has come to associate only with the best air and the purest, wholesomest country influences. What the secret of it may be, I am at a loss to know, unless it is that the moist atmosphere does not dry up the blood as our air does, and that the carbon and creosote have some rare antiseptic and preservative qualities, as doubtless they have,