1509. When artificial plantations join natural woods, the avenues, alleys, and circular glades of the former may be continued a certain length in the latter, so that the point where the natural wood begins, and the artificial plantation ends, may not be discoverable. In aid of this effect, the sort of tree which prevails in the natural scenes should also prevail in the adjoining parts of the artificial wood. When artificial scenes join other artificial scenes, nothing can be easier than, by the reciprocal continuation of avenues, strips, or masses, so far to unite the two seats, as to conceal the boundaries of each, while the two mansions will thus each borrow a splendour from the other. There are still existing proofs of the attention paid to this subject in former times, an instance of which occurs in the apparent connection by avenues between Blenheim, Ditchley, and Heythrop, though the last mansion is nearly ten miles distant from the first.