1840. The plant-box (figs. 461, 462, and 463.) is a substitute for a large pot: it is of a cubical figure, and generally formed of wood, though in some cases the frame is formed of cast iron, and the sides of slates cut to fit, and movable at pleasure. Such boxes are chiefly used for orange trees. The construction of those at Versailles is generally approved. Two of the opposite sides are fixed, the other two are movable, but kept in their places by a couple of iron bars with hinges, which are fastened on one side, and on the other are hooks to catch in (fig. 462.). By using these boxes the state of the roots may be readily examined, the old earth taken out, and fresh put in at pleasure; another material advantage is, that the plants may be shifted by sliding them from one box into another without disturbing the roots.