In spite of the somewhat extreme notions of the “Friends,” who seem to forget that men are driven into cities by the necessity which compels most of them to earn their daily bread, it must be admitted that in the question of air they have hit a blot. The first article of food, namely, fresh air, is that which is least under the command of man. Mr. Milverton says there is no danger of London being starved for want of animal food. There is more and more danger every year of its health being diminished from the want of a supply of fresh air. It is stated, in confirmation of this fact, that every year the hospital surgeons in London find it more difficult to cure wounds and injuries of all kinds to the human body, on account, it is supposed, of the growing impurity of the London air. This bad air kills off the cows. A London cow does not last a third part of the time one does in the country. On this head much more might have been said. The author might have referred to the mournful fate of the fine cattle, who, recently, on the field of their triumph, the Smithfield Club Show, found, not laurels and rewards, but a grave, in consequence of the fog. We read that that famous man, Count Rumford, used to estimate the number of millions of chaldrons of coals which were suspended in the atmosphere of London, and to dwell upon the mischief which was caused to furniture by the smoke when it descended. But there are other special causes of injury, such as dust and chemical emanations of all kinds. The result is that everything in such a city as London soon loses all bloom and freshness, and, indeed, is rapidly deteriorated. The more beautiful the thing, the more swift and fatal is this deterioration. The essayist calculates the injury of property in London, caused, not by reasonable wear and tear, but by the result of the agglomeration of too many people upon one spot of ground, as not less than three or four millions of pounds per annum. It is to be feared the estimate is not exaggerated. There is a further illustration. Sir Rutherford Alcock, as we all know, represented our interests in China. While there he visited the Chinese Wall, and brought back two specimens from it in the way of bricks. These bricks must have been many centuries old, but they had kept their form and betrayed no signs of decay in that atmosphere. Sir Rutherford put these two bricks out in the balcony of his house in London. This was about two years ago. One of these bricks has already gone to pieces, being entirely disintegrated by the corrosive influence of the London atmosphere.