See Livy, Epit. 59; Appian, Bell. Civ. i. 18: Vell. Pat. ii. 4; Val. Max. iii. 7. 6; A.H.J. Greenidge, History of Rome (1904).
2. His son, Gaius Papirius Carbo, surnamed Arvina, was a staunch supporter of the aristocracy, and was put to death by the Marian party in 82. He is known chiefly for the law (Plautia Papiria) carried by him and M. Plautius Silvanus when tribunes of the people in 90 (or 89), whereby the Roman franchise was offered to every Italian ally domiciled in Italy at the time when the law was enacted, provided he made application personally within sixty days to the praetor at Rome (see [Rome]: History, II. “The Republic,” Period C.). The object of the law was to conciliate the states at war with Rome and to secure the loyalty of the federate states. Like his father, Carbo was an orator of distinction.
See Cicero, Pro Archia, 4; Vell. Pat. ii. 26; Appian, Bell. Civ. i. 88.
3. Gnaeus Papirius Carbo (c. 130-82 b.c.), nephew of (1). He was a strong supporter of the Marian party, and took part in the blockade of Rome (87). In 85 he was chosen by Cinna as his colleague in the consulship, and extensive preparations were made for carrying on war in Greece against Sulla, who had announced his intention of returning to Italy. Cinna and Carbo declared themselves consuls for the following year, and large bodies of troops were transported across the Adriatic; but when Cinna was murdered by his own soldiers, who refused to engage in civil war, Carbo was obliged to bring them back. In 82 Carbo, then consul for the third time with the younger Marius, fought an indecisive engagement with Sulla near Clusium, but was defeated with great loss in an attack on the camp of Sulla’s general, Q. Caecilius Metellus Pius [see under [Metellus] (6)] near Faventia. Although he still had a large army and the Samnites remained faithful to him, Carbo was so disheartened by his failure to relieve Praeneste, where the younger Marius had taken refuge, that he decided to leave Italy. He first fled to Africa, thence to the island of Cossyra (Pentellaria), where he was arrested, taken in chains before Pompey at Lilybaeum and put to death.
See Appian, Bell. Civ. i. 67-98; Livy, Epit. 79, 84, 88, 89; Plutarch, Pompey, 5, 6, 10, and Sulla, 28; Cicero, ad Fam. ix. 21; Eutropius, v. 8, 9; Orosius, v. 20; Valerius Maximus, v. 3. 5, ix. 13. 2; art. [Sulla], L. [Cornelius].
CARBOHYDRATE, in chemistry, the generic name for compounds empirically represented by the formula Cx(H2O)y. They are essentially vegetable products, and include the sugars, starches, gums and celluloses (q.v.).
CARBOLIC ACID or Phenol (hydroxy-benzene), C6H5OH, an acid found in the urine of the herbivorae, and in small quantity in castoreum (F. Wöhler, Ann., 1848, 67, p. 360). Its principal commercial source is the fraction of coal-tar which distils between 150 and 200° C., in which it was discovered in 1834 by F. Runge. In order to obtain the phenol from this distillate, it is treated with caustic soda, which dissolves the phenol and its homologues together with a certain quantity of naphthalene and other hydrocarbons. The solution is diluted with water, and the hydrocarbons are thereby precipitated and separated. The solution is then acidified, and the phenols are liberated and form an oily layer on the surface of the acid. This layer is separated, and the phenol recovered by a process of fractional distillation. It may be synthetically prepared by fusing potassium benzene sulphonate with caustic alkalis (A. Kekulé, A. Wurtz); by the action of nitrous acid on aniline; by passing oxygen into boiling benzene containing aluminium chloride (C. Friedel and J.M. Crafts, Ann. Chim. Phys., 1888 (6) 14, p. 435); by heating phenol carboxylic acids with baryta; and, in small quantities by the oxidation of benzene with hydrogen peroxide or nascent ozone (A.R. Leeds, Ber., 1881, 14, p. 976).
It crystallizes in rhombic needles, which melt at 42.5-43° C., and boil at 182-183° C.; its specific gravity is 1.0906 (0° C.). It has a characteristic smell, and a biting taste; it is poisonous, and acts as a powerful antiseptic. It dissolves in water, 15 parts of water dissolving about one part of phenol at 16-17° C., but it is miscible in all proportions at about 70° C.; it is volatile in steam, and is readily soluble in alcohol, ether, benzene, carbon bisulphide, chloroform and glacial acetic acid. It is also readily soluble in solutions of the caustic alkalis, slightly soluble in aqueous ammonia solution, and almost insoluble in sodium carbonate solution. When exposed in the moist condition to the air it gradually acquires a red colour. With ferric chloride it gives a violet coloration, and with bromine water a white precipitate of tribrom-phenol.