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Geological Survey, United States
(Encyclopedia)Geological Survey, United States, bureau organized in 1879 under the Dept. of the Interior to unify and centralize the work already undertaken by separate surveys under Clarence King, F. V. Hayden, Ge...Putnam, Herbert
(Encyclopedia)Putnam, Herbert, 1861–1955, American librarian, b. New York City; son of George P. Putnam. He served as librarian at the Minneapolis Athenaeum (1884–87) and of the Minneapolis Public Library (1887...Ray, John
(Encyclopedia)Ray or Wray, John, 1627–1705, English naturalist. He was extremely influential in laying the foundations of systematic biology. With his pupil Francis Willughby, he planned a complete classification...interstellar matter
(Encyclopedia)interstellar matter, matter in a galaxy between the stars, known also as the interstellar medium. The interstellar gas, which constitutes about 99% of the interstellar matter, consists mostly of hyd...crystal
(Encyclopedia) CE5 Types of crystal crystal, a solid body bounded by natural plane faces that are the external expression of a regular internal arrangement of constituent atoms, molecules, or ions. The formation...concrete
(Encyclopedia)concrete, structural masonry material made by mixing broken stone or gravel with sand, cement, and water and allowing the mixture to harden into a solid mass. The cement is the chemically active eleme...games, children's
(Encyclopedia)games, children's, amusements or pastimes involving more than one child and in which there is some sort of formalized dramatic element, contest, or plot. Games are a cultural universal; for example, t...protozoan
(Encyclopedia)protozoan prōˌtəzōˈən [key], informal term for the unicellular heterotrophs of the kingdom Protista. Protozoans comprise a large, diverse assortment of microscopic or near-microscopic organisms ...prion
(Encyclopedia)prion prēˈŏn [key], abnormal form of a protein found in mammals, now generally believed to cause a group of diseases known as prion diseases or transmissible spongiform encephalopathies, which are ...Lacépède, Bernard Germain Étienne de la Ville, comte de
(Encyclopedia)Lacépède, Bernard Germain Étienne de la Ville, comte de bĕrnärˈ zhĕrmăNˈ ātyĕnˈ də lä vēl kôNt də läsāpĕdˈ [key], 1756–1825, French naturalist. As a youth he showed considerable...Browse by Subject
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