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Clay, Cassius Marcellus

(Encyclopedia)Clay, Cassius Marcellus, 1810–1903, American politician and diplomat, b. Madison co., Ky. Although he came from a slaveholding family, Clay early came to abhor the institution of slavery. In 1845 he...

Clay, Clement Claiborne

(Encyclopedia)Clay, Clement Claiborne, 1816–82, U.S. Senator (1853–61), b. Huntsville, Ala. A legislator and then a judge in his native state, he was twice elected to the U.S. Senate and became an ardent defend...

Clay, Lucius DuBignon

(Encyclopedia)Clay, Lucius DuBignon dəbĭnˈyən, dübēnyôNˈ [key], 1897–1978, American general, b. Marietta, Ga. A graduate of West Point and an engineering officer, he held many army administrative posts an...

Frick, Henry Clay

(Encyclopedia)Frick, Henry Clay, 1849–1919, American industrialist, b. Westmoreland co., Pa. He worked on his father's farm, was a store clerk, and did bookkeeping before he and several associates organized (1871...

Folger, Henry Clay

(Encyclopedia)Folger, Henry Clay fōlˈjər [key], 1857–1930, American industrialist and collector of Shakespeareana. His connection with Standard Oil companies, beginning in 1879, continued until his retirement ...

Examples of Systematic Classification (table)

(Encyclopedia)Examples of Systematic Classification ...

Clay, Cassius Marcellus, Jr.

(Encyclopedia)Clay, Cassius Marcellus, Jr.: see Ali, Muhammad. ...

Ford, William Clay, Jr.

(Encyclopedia)Ford, William Clay, Jr.: see Bill Ford under Ford, Henry. ...

petrology

(Encyclopedia)petrology, branch of geology specifically concerned with the origin, composition, structure, and properties of rocks, primarily igneous and metamorphic, and secondarily sedimentary. It includes petrog...

silicon

(Encyclopedia)silicon, nonmetallic chemical element; symbol Si; at. no. 14; interval in which at. wt. ranges 28.084–28.086; m.p. 1,410℃; b.p. 2,355℃; sp. gr. 2.33 at 25℃; valence usually +4. Silicon is the ...