1833. Brown's flower-pot (fig. 456.) has double closed sides, and may have the vacuity filled with water through a small orifice in the rim or be left empty at pleasure. Every gardener is aware that plants will be prevented from suffering for want of water when the vacuity is filled, and from losing the heat which would be carried off by evaporation if the pot were not furnished with hollow sides. Various other means have been adopted of obtaining the same end; and, indeed, it will generally be sufficient if the flower-pot containing the plant be put within another, at least two sizes larger than itself, the two flower-pots being joined together by a little cement at the base. An improvement on Brown's pot is to have the hole for the admission of water made on the outside.