=882. The drupe, or stone-fruit.=—In the plum, cherry, peach, apricot, etc., the outer portion (exocarp) of the pericarp (ovary) becomes fleshy, while the inner portion (endocarp) becomes hard and stony, and encloses the seed, or “pit.” Such a fruit is known as a drupe, or as a stone-fruit. In the almond the fleshy part of the fruit is removed. [Illustration: Fig. 477. Drupe, or stone-fruit, of plum.] =883. The raspberry and blackberry.=—While these fruits are known popularly as “berries,” they are not berries in the technical sense. Each ovary, or pericarp, in the flower forms a single small fruit, the outer portion being fleshy and the inner stony, just as in the cherry or plum. It is a _drupelet_ (little drupe). All of the drupelets together make the “berry,” and as they ripen the separate drupelets cohere more or less. It is a collection, or aggregation, of fruits, and consequently they are sometimes called _collective fruits_, or _aggregate fruits_. In the raspberry the fruit separates from the receptacle, leaving the latter on the stem, while the drupelets of the blackberry and dewberry adhere to the receptacle and the latter separates from the stem. =884. The berry.=—In the true berry both exocarp (including mesocarp) and endocarp are fleshy or juicy. Good examples are found in cranberries, huckleberries, gooseberries, currants, snowberries, tomatoes, etc. The calyx and wall of the pistil are adnate, and in fruit become fleshy so that the seeds are imbedded in the pulpy juice. The seeds themselves are more or less stony. In the case of berries, as well as in strawberries, raspberries, and blackberries, the fruits are eagerly sought by birds and other animals for food. The seeds being hard are not digested, but are passed with the other animal excrement and thus gain dispersal. V. Reinforced, or Accessory, Fruits. When the torus (receptacle) is grown to the pericarp in fruit, the fruit is said to be _reinforced_. The torus may enclose the pericarps, or the latter may be seated upon the torus. [Illustration: Fig. 478. Fruit of raspberry.] =885. In the strawberry= the receptacle of the flower becomes larger and fleshy, while the “seeds,” which are akenes, are sunk in the surface and are hard and stony. The strawberry thus differs from the raspberry and blackberry, but like them it is not a true berry.