I now make almost daily park-excursions with R----, to render his visit to England as useful as possible; for a good gardener will learn more here in his profession during a short stay, than in a study of ten years at home. There are indeed in the immediate neighbourhood of London a great number of very interesting seats, all of them situated on very pleasant and animated roads. Amongst these may particularly be mentioned a villa of Lord Mansfield's, the decorations of which do much honour to the taste of his lady. Sion House, belonging to the Duke of Northumberland, and laid out by Brown, is also extremely worth seeing, on account of its remarkable green-houses, and the multitude of gigantic exotic trees in the open air, none of which would bear our climate. Here are also to be seen whole groves of rhododendrons, camellias, &c., which are but partially covered in winter; and all kinds of beautiful evergreens thrive luxuriantly in every season. The green and hot-houses, which form a front of three hundred feet, consist only of stone, iron and glass; a style of building which has here the additional advantage of being cheaper than that with wood. I was interested by a kind of chain, the links of which consisted of scythes, for the purpose of clearing the large standing waters (a defect in most English parks): by merely drawing it, like a drag-net, along the bottom, it entirely removes the weeds. In the vast pleasure-ground twelve men are daily mowing from five till nine o'clock. By this means high grass is never to be seen there, and at the same time the disagreeable general mowing is avoided, which destroys the neatness of the garden for some days. It is true that they can do only a part daily; but it is so managed that they finish a certain allotted portion, and they come round so often that the difference in the turf is not perceptible. This short grass is, indeed, quite lost to economy; but beauty and utility cannot always be combined, and the latter must certainly be subordinate in a pleasure-ground, or it is better to relinquish all pretensions to one. Kew, which is on the opposite bank of the river, unquestionably possesses the most complete collection of exotic plants in Europe. The park has also a great advantage in its beautiful situation on the Thames, but is in general rather neglected. Yew trees are found here of the height of our firs, and very fine specimens of holly and evergreen oak; in other respects the old Queen's plantations are not very tasteful. Wimbledon Park, stretching over several hills and full of beautiful groups of trees, present fine views, but the effect of the whole is spoiled by some degree of monotony. ---- House is very near, and almost in the suburbs of London: its architecture is not without interest.