BLADDER-WORT, the name given to a submerged water plant, Utricularia vulgaris, with finely divided leaves upon which are borne small bladders provided with trap-door entrances which open only inwards. Small crustaceans and other aquatic animals push their way into the bladders and are unable to escape. The products of the decay of the organisms thus captured are absorbed into the plant by star-shaped hairs which line the interior of the bladder. In this way the plant is supplied with nitrogenous food from the animal kingdom. Bladder-wort bears small, yellow, two-lipped flowers on a stem which rises above the surface of the water. It is found in pools and ditches in the British Isles, and is widely distributed in the north temperate zone. The genus contains about two hundred species in tropical and temperate regions.
| A, Bladder of Utricularia neglecta (after Darwin), enlarged. B, stellate hairs from interior of bladder of U. vulgaris. |
BLADES, WILLIAM (1824-1890), English printer and bibliographer, was born at Clapham, London, on the 5th of December 1824. In 1840 he was apprenticed to his father’s printing business in London, being subsequently taken into partnership. The firm was afterwards known as Blades, East & Blades. His interest in printing led him to make a study of the volumes produced by Caxton’s press, and of the early history of printing in England. His Life and Typography of William Caxton, England’s First Printer, was published in 1861-1863, and the conclusions which he set forth were arrived at by a careful examination of types in the early books, each class of type being traced from its first use to the time when, spoilt by wear, it passed out of Caxton’s hands. Some 450 volumes from the Caxton Press were thus carefully compared and classified in chronological order. In 1877 Blades took an active part in organizing the Caxton celebration, and strongly supported the foundation of the Library Association. He was a keen collector of old books, prints and medals. His publications relate chiefly to the early history of printing, the Enemies of Books, his most popular work, being produced in 1881. He died at Sutton in Surrey on the 27th of April 1890.
BLAENAVON, or Blaenafon, an urban district in the northern parliamentary division of Monmouthshire, England, 15 m. N. by W. of Newport, on the Great Western, London & North Western and Rhymney railways. Pop. (1901) 10,869. It lies in the uppermost part of the Afon Lwyd valley, at an elevation exceeding 1000 ft., in a wild and mountainous district, on the eastern edge of the great coal and iron mining region of Glamorganshire and Monmouthshire. There are very extensive iron and steel works, with blast furnaces and rolling mills in the district, which employ the large industrial population.
BLAGOVYESHCHENSK, a town of East Siberia, chief town of the Amur government, on the left bank of the Amur, near its confluence with the Zeya in 50° 15′ N. lat. and 127° 38′ E. long., 610 m. by river above Khabarovsk. Founded in 1856, the town had, in 1900, 37,368 inhabitants, and is the seat of the bishop of Amur and Kamchatka. There are steam flour-mills and ironworks. It is a centre for tea exported to Russia, cattle brought from Transbaikalia and Mongolia for the Amur, and for grain.