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Welland Ship Canal

(Encyclopedia)Welland Ship Canal, 27.6 mi (44.4 km) long, SE Ont., Canada, connecting Lake Ontario with Lake Erie and bypassing Niagara Falls. Built between 1914 and 1932 by Canada to replace a canal opened in 1829...

Tennessee, University of

(Encyclopedia)Tennessee, University of, main campus at Knoxville; land-grant and state supported; coeducational; chartered 1794, opened 1795 as Blount College; became East Tennessee College 1807; closed 1807–20; ...

Piedras Negras, ancient city, Guatemala

(Encyclopedia)Piedras Negras pyāˈᵺräs nāˈgräs [key] [Span.,=black stones], ruined city of the Classic era of the Maya, NW Petén, Guatemala, in the Usumacinta valley. Reaching a peak of sculptural achieveme...

Sedgwick, Adam

(Encyclopedia)Sedgwick, Adam, 1785–1873, English geologist. He was a professor at Cambridge from 1818. His most important work was a study, made with R. I. Murchison, of the rock formation of Devonshire, which th...

spinel

(Encyclopedia)spinel, magnesium aluminum oxide, MgAl2O4, a mineral crystallizing in the isometric system, usually as octahedrons. It occurs as an accessory mineral in basic igneous rocks, in aluminum-rich metamorph...

Sierra Maestra

(Encyclopedia)Sierra Maestra syāˈrä mäāˈsträ [key], rugged mountain range, SE Cuba, rising abruptly from the coast. Consisting of connecting ranges with local names, the Sierra Maestra is the highest system ...

Shoshone project

(Encyclopedia)Shoshone project, NW Wyo., near the Mont. line and in the Shoshone River basin. Developed by the U.S. Bureau of Reclamation, it irrigates a large portion of land and has four divisions. The project is...

cryptosporidium

(Encyclopedia)cryptosporidium krĭpˌtōspərĭdˈēəm [key], genus of protozoans having at least four species; they are waterborne parasites that cause the disease cryptosporidiosis. One of the species appears to...

Chang Chih-tung

(Encyclopedia)Chang Chih-tung jängˈ jûrˈ-do͝ongˈ [key], 1837–1909, Chinese Ch'ing dynasty statesman and educational reformer. He occupied the high post of governor-general for over two decades, first of Gua...

Henry, Joseph

(Encyclopedia)Henry, Joseph, 1797–1878, American physicist, b. Albany, N.Y., educated at Albany Academy. He taught (1826–32) mathematics and natural philosophy at Albany Academy and was professor of natural phi...