The exhibition of paintings by the Royal Academy is now open. I see nothing in it to astonish one who has visited the exhibitions of our Academy of the Arts of Design in New York, except that some of the worst pictures were hung in the most conspicuous places. This is the case with four or five pictures by Turner—a great artist, and a man of genius, but who paints very strangely of late years. To my unlearned eyes, they were mere blotches of white paint, with streaks of yellow and red, and without any intelligible design. To use a phrase very common in England, they are the most extraordinary pictures I ever saw. Haydon also has spoiled several yards of good canvas with a most hideous picture of Uriel and Satan, and to this is assigned one of the very best places in the collection. There is more uniformity of style and coloring than with us; more appearance of an attempt to conform to a certain general model, so that of course there are fewer unpleasant contrasts of manner: but this is no advantage, inasmuch as it prevents the artist from seeking to attain excellence in the way for which he is best fitted. The number of paintings is far greater than in our exhibitions; but the proportion of good ones is really far smaller. There are some extremely clever things by Webster, who appears to be a favorite with the public; some fine miniatures by Thorburn, a young Scotch artist who has suddenly become eminent, and several beautiful landscapes by Stanfield, an artist of high promise. We observed in the catalogue, the names of three or four of our American artists; but on looking for their works, we found them all hung so high as to be out of sight, except one, and that was in what is called the condemned room, where only a glimmer of light enters, and where the hanging committee are in the practice of thrusting any such pictures as they can not help exhibiting, but wish to keep in the dark.

My English friends apologize for the wretchedness of the collection, its rows of indifferent portraits and its multitude of feeble imitations in historical and landscape painting, by saying that the more eminent artists are preparing themselves to paint the walls and ceilings of the new Houses of Parliament in fresco. The pinnacles and turrets of that vast and magnificent structure, built of a cream-colored stone, and florid with Gothic tracery, copied from the ancient chapel of St. Stephen, the greater part of which was not long ago destroyed by fire, are rising from day to day above the city roofs. We walked through its broad and long passages and looked into its unfinished halls, swarming with stone-cutters and masons, and thought that if half of them were to be painted in fresco, the best artists of England have the work of years before them.

With the exhibition of drawings in water-colors, which is a separate affair from the paintings in oil, I was much better pleased. The late improvement in this branch of art, is, I believe, entirely due to English artists. They have given to their drawings of this class a richness, a force of effect, a depth of shadow and strength of light, and a truth of representation which astonishes those who are accustomed only to the meagreness and tenuity of the old manner. I have hardly seen any landscapes which exceeded, in the perfectness of the illusion, one or two which I saw in the collection I visited, and I could hardly persuade myself that a flower-piece on which I looked, representing a bunch of hollyhocks, was not the real thing after all, so crisp were the leaves, so juicy the stalks, and with such skillful relief was flower heaped upon flower and leaf upon leaf.

Letter XXI.

The Parks of London.—The Police.

London, June 24, 1845.

Nothing can be more striking to one who is accustomed to the little inclosures called public parks in our American cities, than the spacious, open grounds of London. I doubt, in fact, whether any person fully comprehends their extent, from any of the ordinary descriptions of them, until he has seen them or tried to walk over them. You begin at the east end of St. James's Park, and proceed along its graveled walks, and its colonnades of old trees, among its thickets of ornamental shrubs carefully inclosed, its grass-plots maintained in perpetual freshness and verdure by the moist climate and the ever-dropping skies, its artificial sheets of water covered with aquatic birds of the most beautiful species, until you begin almost to wonder whether the park has a western extremity. You reach it at last, and proceed between the green fields of Constitution Hill, when you find yourself at the corner of Hyde Park, a much more spacious pleasure-ground. You proceed westward in Hyde Park until you are weary, when you find yourself on the verge of Kensington Gardens, a vast extent of ancient woods and intervening lawns, to which the eye sees no limit, and in whose walks it seems as if the whole population of London might lose itself. North of Hyde Park, after passing a few streets, you reach the great square of Regent's Park, where, as you stand at one boundary the other is almost undistinguishable in the dull London atmosphere. North of this park rises Primrose Hill, a bare, grassy eminence, which I hear has been purchased for a public ground and will be planted with trees. All round these immense inclosures, presses the densest population of the civilized world. Within, such is their extent, is a fresh and pure atmosphere, and the odors of plants and flowers, and the twittering of innumerable birds more musical than those of our own woods, which build and rear their young here, and the hum of insects in the sunshine. Without are close and crowded streets, swarming with foot-passengers, and choked with drays and carriages.

These parks have been called the lungs of London, and so important are they regarded to the public health and the happiness of the people, that I believe a proposal to dispense with some part of their extent, and cover it with streets and houses, would be regarded in much the same manner as a proposal to hang every tenth man in London. They will probably remain public grounds as long as London has an existence.

The population of your city, increasing with such prodigious rapidity; your sultry summers, and the corrupt atmosphere generated in hot and crowded streets, make it a cause of regret that in laying out New York, no preparation was made, while it was yet practicable, for a range of parks and public gardens along the central part of the island or elsewhere, to remain perpetually for the refreshment and recreation of the citizens during the torrid heats of the warm season. There are yet unoccupied lands on the island which might, I suppose, be procured for the purpose, and which, on account of their rocky and uneven surface, might be laid out into surpassingly beautiful pleasure-grounds; but while we are discussing the subject the advancing population of the city is sweeping over them and covering them from our reach.

If we go out of the parks into the streets we find the causes of a corrupt atmosphere much more carefully removed than with us. The streets of London are always clean. Every day, early in the morning, they are swept; and some of them, I believe, at other hours also, by a machine drawn by one of the powerful dray-horses of this country. Whenever an unusually large and fine horse of this breed is produced in the country, he is sent to the London market, and remarkable animals they are, of a height and stature almost elephantine, large-limbed, slow-paced, shaggy-footed, sweeping the ground with their fetlocks, each huge foot armed with a shoe weighing from five to six pounds. One of these strong creatures is harnessed to a street-cleaning machine, which consists of brushes turning over a cylinder and sweeping the dust of the streets into a kind of box. Whether it be wet or dry dust, or mud, the work is thoroughly performed; it is all drawn into the receptacle provided for it, and the huge horse stalks backward and forward along the street until it is almost as clean as a drawing-room.