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UAUPES 63 UDALL form, and its history in general, U cor- responds with the Greek upsilon. Greek words containing the diphthong ou, when Latinized, were spelled with a u; while Greek words with u, when Latinized, were spelled with y. U as an initial is used for United, as in U. S. United States; U. S. A. United States of America, and United States Army; U. S. N. United States Navy; U. K.=the United Kingdom; U. P. United Presbyterian (Scotch) ; U. C. or A. U. C. in dates belonging to Roman history is a contraction for Ab urhe condita=fYom the building of the city (of Rome), as U. C. 400 = in the year of Rome 400. U as a symbol is used, in chemistry, for uranium. UAUPES, a river in Brazil, the largest tributary of the Rio Negi'o; length about 700 miles. UBALDINl, PETRUCCIO, an Italian historian; born in Florence, Italy, about 1524. He wrote: "Life of Charlemagne" (1581) ; "Description of Scotland and Its Isles" (1588) ; "Lives of Illustrious Ladies of England and Scotland" (1591) ; "Precepts, Moral, Political, and Economic" (1592). He died in London, England, about 1600. UBANGI, a river in Kongo Free State; a tributary of the Kongo river, into which it flows a little S. of the equa- tor. It is about 1,500 miles long. UBEDA. a town of Spain; on a plateau between the Guadalquivir and Guadalimar; 26 miles N. E. of Jaen. It contains a large castle, and manufac- tures cloth, soap, and leather. A flour- ishing town under the Moors, it wit- nessed the victory in 1210 of the kings of Navarre and Castile over Abdallah Mohammed of Morocco. Pop. about 25,000. UBEETI, FAZIO (or BONIFAZIO) DEGLI (o-bar'te), an Italian poet; born in Pisa, Italy, between 1305 and 1309; was a grandson of Uberti, one of the Florentine leaders of the Ghibelline fac- tion, and was driven into exile by the Guelphs. He wrote an unfinished descrip- tive poem called "The News of the World," which was quite celebrated, and a poem, "Ditta-Mondo," in imitation of Dante's "Divina Commedia." He died after 1368. U-BOATS. See Submarine. UCAYALI, a river of eastern Peru; one of the main aflfluents of the Amazon, of which it was formerly regarded as the head stream. This honor is now accorded, however, to the Maraiion, which, though shorter than the Ucayali, is twice as broad as the latter at their confluence. The Ucayali rises in the mountains of southern Peru, some of its feeders having their sources only 150 miles from the Pacific on the one hand, and 100 miles from Lake Titicaca on the other. In its upper course it is known as the Apurimac, and below the junction of the Mantara, in lat. 12° S., it is called the Tambo. After receiving the united waters of the Urubamba and Camisea in lat. 9° S., it becomes known as the Uca- yali. Its entire course is about 1,500 miles. The Ucayali has been navigated by steamers for a great part of its course, and a steamer has penetrated by the Pachitea, a tributary on its left bank, to within 220 miles of Callao. The Apurimac is not navigable; but with, this exception, and that of a fall on the Lower Urubamba, the Ucayali and its principal tributaries are most valuable highways to the heart of a region abounding in vegetable and mineral wealth. UCCELLO, PAOLO DI BONO, an Italian painter; born in Florence, Italy, about 1397. He was the first to develop the principles of perspective. His works were principally in fresco, and are nu- merous in Italian cities. He died in Florence, Dec. 11, 1475. UCHABD, MARIO, a French author; born in Paris, France, Dec. 28, 1824. Among his dramatic compositions are: "The Husband's Return" (1858) ; "Sec- ond Youth" (1859) ; "A Burgomaster's Prosperity" (1864); "The Channers'* (1864). His novels include: "Ray- mond" (1862) ; "Gertrude's Marriage" (1862); "Countess Diana" (1864); "A Last Passion" (1866) ; "My Uncle Bar- basson" (1876) ; "My Cousin Antoinette" (1891). He died in Paris, July 31, 1893. UDAIPUR, or MEWAR, a native state of Rajputana, British India; area, 12,753 square miles; pop. about 1,400,- 000. The capital is Udaipur (sometimes spelt Oodeypore), picturesquely situated on a ridge overlooking a romantic lake, 140 miles S. S. W. of Ajmere. Pop. about 50,000. UDALL, NICHOLAS, an English author; born in Hampshire, England, in 1505 or 1506; was educated at Oxford; chose the profession of a schoolmaster; and in 1534 passed M. A. and obtained the post of headmaster of Eton, which he held till 1541, when he was dismissed. He afterward resigned the vicarship of Braintree in Essex, which he had en- joyed along with his mastership; but continued both to teach and preach, and in 1551 was admitted a prebendary of Windsor, and in 1554-1555 appointed