Capsule (Lat. capsula, a small box), a name given by botanists to any kind of dry seed vessel containing many cells and seeds, such as poppy heads, etc. The pods of peas and beans, etc, are called capsules, as well as the seed-containing vessels or fruit of many other families of plants. A capsule usually opens by valves; und hence different varieties have been named bivalve, trivalve, quadrivalve, and mul-tivalve. The parts of a capsule are: 1, the valves, ribs, or divisions which form the outward shell, and shield the fruit externally; 2, the partition walls, which form different cells internally; 3, the axis or columella, which unites the seeds with the internal parts of the capsule; 4, the cells occupied by the seeds; 5, the proper receptacle of each seed; and 6, the seeds contained within the capsule. According to the number of internal partitions in a capsule, they have been named unilocular, biloc-ular, trilocular, multilocular. Capsular seed vessels are generally dry and hard when ripe; and in this respect they are unlike the pulpy fruit of apples, plums, etc, or the juicy oranges and lemons. . All fruits, however, are merely seed vessels, and the name capsule is usually applied to all dry, hard seed vessels, irrespective of particular forms and families of plants.