The prettiest public fêtes in London are those given in the gardens of the Botanical Society in the Regent\'s Park. There is to be found plenty of fresh green turf; there are myriads of lovely flowers blooming in open beds, or tastefully arranged beneath the marquees; there are solemn old big trees stretching out their umbrageous arms, and in their majesty making one think even less favourably than usual of the perky straggling sticks at South Kensington; there are the bands of two or three guards regiments, having sufficient compass............