1989. The common glass-case is a glazed wooden frame or frames, so contrived as to fit together, and cover either single trees, espaliers, or shrubs too large for the hand-glass. The flavour of plums and cherries on espaliers, in bad seasons, is much improved by the use of this structure. In France it is chiefly used for peaches. For orange trees, it consists of a number of frames, chiefly parallelograms, but partly right-angled triangles (fig. 559.), casily put together and taken asunder; to be used in the summer months in growing melons, or covering walls or espalier-rails; and in winter, in protecting orange trees in situations where they are planted in rows against walls, or in groves in the open air.