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.