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color

(Encyclopedia)color, effect produced on the eye and its associated nerves by light waves of different wavelength or frequency. Light transmitted from an object to the eye stimulates the different color cones of the...

color blindness

(Encyclopedia)color blindness, visual defect resulting in the inability to distinguish colors. About 8% of men and 0.5% of women experience some difficulty in color perception. Color blindness is usually an inherit...

Riel, Louis

(Encyclopedia)Riel, Louis lwē rēĕlˈ [key], 1844–85, Canadian insurgent, leader of two rebellions, b. Manitoba, of French and Métis parentage. In 1869–70 he led the rebels of the Red River settlements, main...

spleen

(Encyclopedia)spleen, soft, purplish-red organ that lies under the diaphragm on the left side of the abdominal cavity. The spleen acts as a filter against foreign organisms that infect the bloodstream, and also fil...

McAdoo, William Gibbs

(Encyclopedia)McAdoo, William Gibbs măkˈədo͞o [key], 1863–1941, American political leader, U.S. secretary of the treasury (1913–18), b. near Marietta, Ga. The son of a prominent Georgia jurist, McAdoo becam...

Hare, Robert

(Encyclopedia)Hare, Robert, 1781–1858, American chemist, b. Philadelphia. He was professor of chemistry (1819–47) at the medical college of the Univ. of Pennsylvania. Hare made important contributions to early ...

Geneva, city, United States

(Encyclopedia)Geneva, city (2020 pop. 12,812), Ontario co., W central N.Y., in the Finger Lakes region; inc. as a city 1897. Located in a farm area, Geneva's manufact...

Dobell, Sydney Thompson

(Encyclopedia)Dobell, Sydney Thompson dōbĕlˈ [key], 1824–74, English poet. He is best known for the melodramatic, extravagantly emotional poem Balder (1853). In 1855 he published jointly with Alexander Smith (...

Van Dyck, Cornelius Van Alen

(Encyclopedia)Van Dyck, Cornelius Van Alen, 1818–95, American missionary, b. Kinderhook, N.Y. In 1840 he went to Syria as a medical missionary. In 1846 he was ordained in the Congregational ministry. Besides bein...

Devon cattle

(Encyclopedia)Devon cattle dĕvˈən [key], breed of cattle originated in England and brought to America by colonists as early as 1623. They range in color from deep red to pale chestnut, the most popular being “...