The most effective mode of increasing the number of species would be, - 20, 30, or 40 years hence, to take up the trees and shrubs of the belt, as well as all the other trees and shrubs; to reduce the whole to a tabula rasa; to surround the whole with a boundary wall; to form a narrow border and a walk within this wall; to plant the wall with select kinds which would not grow so well in the open ground; and to include the remaining part of the ground occupied by the belt in the present Arboretum. There would then not be a single duplicate tree or shrub within the enclosure, except some of those in the miscellaneous collection against the wall, and those contained in the flower-garden. This rearrangement of the whole would create a new interest, not only by the change in general appearance, but by the many new kinds which would be added, and by the great beauty and interest of the miscellaneous collection against the wall, and of the bulbous-rooted herbaceous plants which might be planted at its base. In this way the Arboretum might be rearranged every 20, 30, or 40 years, for an indefinite period; always maintaining its original character of entertainment and instruction, and always kept up to the existing state of knowledge and arboricultural riches. As improvements are continually making in the nomenclature of plants, the names should be revised by a competent botanist every time the Arboretum is taken up and replanted, To prevent the plants from being injured by giving away cuttings for propagation to nurserymen, or specimens to botanists, the curator ought to be forbidden to give away any, except to one substantial and extensive local nurseryman, and this only upon condition that such nurseryman agreed to supply from his own nursery, or to procure from other nurseries, all plants that might be wanted as substitutes for overgrown plants removed, or for deaths. At the same time, every nurseryman and botanist, as well as all other persons, ought to be allowed to inspect and study the plants at all seasons, and for this purpose the curator should keep in his lodge the copy of my Arboretum Britannicum, which I have presented to the Arboretum, and should allow all enquiring persons to consult it. For general observers and lovers of trees and shrubs, the catalogue contained in the pamphlet prepared by me, and sold by the curator, or my abridged edition of the Arboretum, will be sufficient, at least for some years to come. To check idle curiosity and a needless waste of time, the curator might be allowed to charge 1d. or 2d. per hour for the use of the copy of the Arboretum in the lodge; but, on no consideration whatever, ought he to be allowed to take it, or allow it to be taken, out of the public room.
