Appenzell (a˙p'pen-tsel), a Swiss canton, wholly enclosed by the canton of St. Gall; area, 162 sq. miles. It is divided into two independent portions or half-cantons, Outer-Rhoden, which is Protestant, and Inner-Rhoden, which is Catholic. It is an elevated district, traversed by branches of the Alps; Mount Säntis in the centre being 8250 feet high. It is watered by the Sitter and by several smaller affluents of the Rhine. Glaciers occupy the higher valleys. Flax, hemp, grain, fruit, &c., are produced, but the wealth of Inner-Rhoden lies in its herds

and flocks—that of Outer-Rhoden in its manufactures of embroidered muslins, gauzes, cambrics, and other cotton stuffs; also of silk goods and paper. The town of Appenzell (Ger. Abtenzelle, abbot's cell) is the capital of Inner-Rhoden, on the Sitter, with about 4300 inhabitants. Trogen is the capital of Outer-Rhoden, Herisau the largest town (pop. 11,000). Pop. Outer-Rhoden, 60,000; Inner-Rhoden, 15,000.

Apperception. See Metaphysics.

Ap´petite, in its widest sense, means the natural desire for gratification, either of the body or the mind; but is generally applied to the recurrent and intermittent desire for food. A healthy appetite is favoured by work, exercise, plain living, and cheerfulness; absence of this feeling, or defective appetite (anorexia), indicates diseased action of the stomach, or of the nervous system or circulation, or it may result from vicious habits. Depraved appetite (pica), or a desire for unnatural food, as chalk, ashes, dirt, soap, &c., depends often in the case of children on vicious tastes or habits; in grown-up persons it may be symptomatic of dyspepsia, pregnancy or chlorosis. Insatiable or canine appetite or voracity (bulimia) when it occurs in childhood is generally symptomatic of worms; in adults common causes are pregnancy, vicious habits, and indigestion caused by stomach complaints or gluttony, when the gnawing pains of disease are mistaken for hunger.

Ap´pian, a Roman historian of the second century after Christ, a native of Alexandria, was governor and manager of the imperial revenues under Hadrian, Trajan, and Antoninus Pius, in Rome. He compiled in Greek a Roman history, from the earliest times to those of Augustus, in twenty-four books, of which only eleven have come down to us. Appian's style is not attractive, but he gives us much valuable information.

Appia´ni, Andrea, a painter, born at Milan in 1754, died in 1817. As a fresco-painter he excelled every contemporary painter in Italy. He displayed his skill particularly in the cupola of Santa Maria di S. Celso at Milan, and in the paintings representing the legend of Cupid and Psyche prepared for the walls and ceiling of the villa of the Archduke Ferdinand at Monza (1795). Napoleon appointed him royal court painter, and portraits of almost the whole of the imperial family were painted by him.

Appian Way, called Regina Viarum, the Queen of Roads: the oldest and most renowned Roman road, was constructed during the censorship of Appius Claudius Cæcus (313-310 B.C.). It was built with large square stones on a raised platform, and was made direct from the gates of Rome to Capua, in Campania. It was afterwards extended through Samnium and Apulia to Brundusium, the modern Brindisi. It was partially restored by Pius VI, and between 1850 and 1853 it was excavated by order of Pius IX as far as the eleventh milestone from Rome.

Appius Claudius, surnamed Cæcus, or the blind, a Roman patrician, elected censor 312 B.C., which office he held four years. While in this position he made every effort to weaken the power of the Plebs, and constructed the road and aqueduct named after him. He was subsequently twice consul, and once dictator. In his old age he became blind, but in 280 B.C. he made a famous speech in which he induced the senate to reject the terms of peace fixed by Pyrrhus. He is the earliest Roman writer of prose and verse whose name we know.

Appius Claudius Crassus, one of the Roman decemvirs, appointed 451 B.C. to draw up a new code of laws. He and his colleagues plotted to retain their power permanently, and at the expiry of their year of office refused to give up their authority. The people were incensed against them, and the following circumstances led to their overthrow. Appius Claudius had conceived an evil passion for Virginia, the daughter of Lucius Virginius, then absent with the army in the war with the Æqui and Sabines. At the instigation of Appius, Marcus Claudius, one of his clients, claimed Virginia as the daughter of one of his own female slaves, and the decemvir, acting as judge, decided that in the meantime she should remain in the custody of the claimant. Virginius, hastily summoned from the army, appeared with his daughter next day in the forum, and appealed to the people; but Appius Claudius again adjudged her to Marcus Claudius. Unable to rescue his daughter, the unhappy father stabbed her to the heart. The decemvirs were deposed by the indignant people 449 B.C., and Appius Claudius died in prison or was strangled.

Apple (Pyrus Malus), the fruit of a well-known tree of the nat. ord. Rosaceæ, or the tree itself. The apple belongs to the temperate regions of the globe, over which it is almost universally spread and cultivated. The tree attains a moderate height, with spreading branches; the leaf is ovate; and the flowers are produced from the wood of the former year; but more generally from very short shoots or spurs from wood of two years' growth. The original of all the varieties of the cultivated apple is the wild crab, which has a small and extremely sour fruit, and is a native of most of the countries of Europe. Apples have been used as food and cultivated for upwards of 4000 years, and were probably introduced into Britain by the Romans. The greater number of the varieties now grown have, however, been cultivated only within the last century or so. To the facility of multiplying varieties by grafting is to be ascribed the amazing extension