[Footnote 26: Or a city. Any one who remembers entering Carlsruhe from the north by the two miles of poplar avenue, remembers entering the most soulless of all cities, by the most lifeless of all entrances.] 152. The original idea was given by the opening of the tangled glades in our most ancient forests. It is rather a curious circumstance that, in those woods whose decay has been most instrumental in forming the bog districts of Ireland, the trees have, in general, been planted in symmetrical rows, at distances of about twenty feet apart. If the arrangement of our later woods be not quite so formal, they at least present frequent openings, carpeted with green sward, and edged with various foliage, which the architect (for so may the designer of the avenue be entitled) should do little more than reduce to symmetry and place in position, preserving, as much as possible, the manner and the proportions of nature. The avenue, therefore, must not be too long. It is quite a mistake to suppose that there is sublimity in a monotonous length of line, unless indeed it be carried to an extent generally impossible, as in the case of the long walk at Windsor. From three to four hundred yards is a length which will display the elevation well, and will not become tiresome from continued monotony. The kind of tree must, of course, be regulated by circumstances; but the foliage must be unequally disposed, so as to let in passages of light across the path, and cause the motion of any object across it to change, like an undulating melody, from darkness to light. It should meet at the top, so as to cause twilight, but not obscurity; and the idea of a vaulted roof, without rigidity. The ground should be green, so that the sunlight may tell with force wherever it strikes. Now, this kind of rich and shadowy vista is found in its perfection only in England: it is an attribute of green country; it is associated with all our memories of forest freedom, of our wood-rangers, and yeomen with the "doublets of the Lincoln green;" with our pride of ancient archers, whose art was fostered in such long and breezeless glades; with our thoughts of the merry chases of our kingly companies, when the dewy antlers sparkled down the intertwined paths of the windless woods, at the morning echo of the hunter's horn; with all, in fact, that once contributed to give our land its ancient name of "merry" England; a name which, in this age of steam and iron, it will have some difficulty in keeping.