Terraces are not permissible anywhere but around the mansion. Mr. Whately justly observes, in connection with these structures, that, -

"Choice arrangement, composition, improvement, and preservation, are so many symptoms of art which may occasionally appear in several parts of a garden, but ought to be displayed without reserve near the house; nothing there should seem neglected; it is a scene of the most cultivated nature; it ought to be enriched - it ought to be adorned; and design may be avowed in the plan, and expense in the execution".

Mr. Loudon is more practical on this subject, and observes, -

"The breadth of terraces, and their height relatively to the level of the floor of the living-rooms, must depend jointly on the height of the floor of the living-rooms and the surface of the grounds or country to be seen over them. Too broad or too high a terrace will both have the effect of foreshortening a lawn with a declining surface, or concealing a near valley. The safest mode, in doubtful cases, is not to form this appendage till after the principal floor is laid, and then to determine the details of the terrace by trial and correction.

"Narrow terraces are entirely occupied as promenades, and may be either gravelled or paved; and different levels, when they exist, connected by inclined planes or flights of steps. Where the breadth is more than is requisite for walks, the borders may be kept in turf, with groups or marginal strips of flowers and low shrubs. In some cases the terrace-walls may be so extended as to enclose ground sufficient for a level plot to be used as a bowling green. These are generally connected with one of the living-rooms, or ihe conservatory; and to the latter is frequently joined an aviary, and the entire range of botanic stoves." - Enc. Gard.