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opal

(Encyclopedia)opal ōˈpəl [key], a mineral consisting of poorly crystalline to amorphous silica, SiO2·nH2O; the water content is quite variable but usually ranges from 3% to 10%. Common opal is usually colorless...

Index, in the Roman Catholic Church

(Encyclopedia)Index, in the Roman Catholic Church, list of publications forbidden to be read, called Index librorum prohibitorum [list of forbidden books]. This censorship was exercised by the Holy See. Catholics a...

herbarium

(Encyclopedia)herbarium, collection of dried and mounted plant specimens used in systematic botany. To preserve their form and color, plants collected in the field are spread flat in sheets of newsprint and dried, ...

Wheatley, Henry Benjamin

(Encyclopedia)Wheatley, Henry Benjamin, 1838–1917, English bibliographer and antiquarian, a founder of the Early English Text Society and of the Index Society. Wheatley's work on the indexing of books, How to Mak...

sextant

(Encyclopedia)CE5 Sextant sextant, instrument for measuring the altitude of the sun or another celestial body; such measurements can then be used to determine the observer's geographical position or for other n...

Poole, William Frederick

(Encyclopedia)Poole, William Frederick, 1821–94, American librarian, bibliographer, and historian, b. Essex co., Mass. Poole was librarian of the Boston Athenæum (1856–69), of the public libraries of Cincinnat...

price

(Encyclopedia)price, amount of money for which a unit of goods or services is exchanged. Price is equivalent to market value and may or may not measure the intrinsic value of the goods or services to the buyer or s...

Bogle, Jack

(Encyclopedia)Bogle, Jack (John Clifton Bogle) [key], 1929–2019, American financial executive, b. Montclair, N.J., grad. Princeton (1951). Going to work for Walter Morgan's Wellington Fund, he became CEO in 1967...

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