LONDON'S OPEN AIR No. 2 City Gardens London has many unexpected gardens. Bright yet casual, they redeem the desolation of war, they set off the soot and the silver of city stone. Within the shadow of St. Paul's. by St. James's in Piccadilly, at Finsbury Circus, at Lincoln's Inn, they give sanctuary from the thronging pavements; they offer space where the din of the streets is made softer and less compelling by the colour of flowers and by flowering shrubs leaf-shadowed on unexpected grass. For those who want a wider scene, Victoria Tower Gardens and the narrow stretch of Tower Wharf offer riverside gardens overlooking the barges sweeping down and the stir and flurry of the ebbing tide. The Londoner knows and enjoys these simple and unaffected places. Enjoy the open air, but please avoid the rush hours.