Our old friend, Charles Waterton, has commenced to write for the London Gardeners' Chronicle with his former terseness and tact. We copy the following curious fact: "Trees in walls are always rude intruders, having no business there. Seeds of trees floating down the torrent, or driven by the wind, will enter crevices of walls, and there take root with scanty means of nourishment. And if the superincumbent pressure of the stones be too strong for the new tenant to lift them up; it will gradually elbow itself out at the junction of the stones, and there in time form an excrescence on the face of the wall, holding the stones in its firm embrace. Dyer, the poet, must have witnessed this at Grongar Hill, when he described the ivy supporting the wall.

'There both a safety from the wind, In mutual dependence find.'

"But we have here a phenomenon still more striking. It is of a nut-tree supporting a large millstone. About a century ago our watermill of ancient days was destroyed, to make way for supposed improvements; and nothing now remains to show the spot where once it stood, save a huge millstone. For years it lay flat on the ground amongst surrounding cherry-trees, till in the autumn of 1811, some animal, possibly a squirrel, deposited a few nuts at the bottom of the hole in the centre of the millstone. During the following spring one of these nuts began to germinate, and then raised its puny head out at the hole in the stone. One day I observed to a naval officer who was standing by, that the diminutive plant before us, if it lived and had good luck, would, in time, lift the millstone from the ground where it lay, and then support it. He doubted this. But time has shown that he was wrong in his surmise.

" The young nut-plant improved in health and strength till it entirely filled the cavity of the stone; so that, to the inspecting eye, the wood and stone seemed to form a compact body. It now began to lift the stone. Tear after year this massive millstone rose a trifle from earth to sky, and whilst I am writing this, it is now nearly nine inches in mid air. The nuts are excellent, and always full grown; whilst the tree itself which bears them, sets tempests at defiance; and, notwithstanding its gigantic burden, is never seen even to totter when ' the stormy winds do blow.'

"It goes by the name of old Mr. Bull with the national debt round his neck. Facetious appellation! Nevertheless it seems to offer a lesson to the speculative politician, that this millstone must ultimately be smashed by the hand of man, or the tree itself must die of strangulation." - Charles Waterlon, Walton Hall.