It consists of a winding box-bordered walk leading to a central thorn-bush, the whole affair being oval in outline, about thirty yards in circumference and surrounded by a paling. Close at hand, and enclosed within a square stone wall, is Queen Mary's garden, containing at the centre an old box tree which is affirmed to have been planted by the little princess herself. Another Scottish relic which is said to mark the site of an old terrace maze is that near Stirling Castle, known since the fourteenth century as the "Round Tabill" or the "King's Knot." There is a "Queen Mary's Bower," by the way, in the gardens at Hampton Court, but this is only a straight walk shaded by an avenue of pollarded elms, which forms a sort of verdant tunnel. It is situated at the summit of a bank rising above one side of the King's Privy Garden. An old tower planted with shrubs at Chatsworth bears the same name. We shall have occasion to refer to "bowers" again later on, in another connection. The present mention of them forms a convenient transition from the subject of garden labyrinths to that of _hedge mazes_. CHAPTER XIV THE TOPIARY LABYRINTH, OR HEDGE MAZE The art of trimming hedges of evergreens is of great antiquity; probably it is almost as old as horticulture itself. The Romans made much use of the services of the _topiarius_, or hedge-trimmer--he is referred to by Cicero and other writers--and it is quite possible that they had shrubs or bushes trained to enclose winding paths in the manner of a hedge maze. In Pliny's "Natural History" (Book XVI, Ch. 33) the cypress is spoken of as being clipped and trimmed to form hedges or lengthened out in various designs for ornamental purposes. In Book XV he tells us that a shrub called _taxa_ is also used in ornamental gardening, from which we might conclude that the yew (_taxus_) was intended. From the description in the context, however, it is more likely that Pliny was speaking of a plant something like our "butcher's broom" (_Ruscus aculeatus_). He also mentions the box and a species of laurel as being suitable for this kind of work. A hint of something like a hedge maze is given in one of the epistles of the younger Pliny, where he describes the gardens of his _villa_ in Tuscany. He speaks of having a _hippodromus_, a kind of circus consisting of many paths separated by box hedges and ornamented with topiary work.