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Eratosthenes

(Encyclopedia)Eratosthenes ĕrətŏsˈthənēz [key], c.275–c.195 b.c., Greek scholar, b. Cyrene. A pupil of Callimachus in Athens, he became (c.240 b.c.) head of the library at Alexandria. Known for his versatil...

Reclus, Jean Jacques Élisée

(Encyclopedia)Reclus, Jean Jacques Élisée zhäN zhäk ālēzāˈ rəklüˈ [key], 1830–1905, French geographer, b. Gironde, educated mainly in Germany, where he studied under Karl Ritter. Several times he was f...

Smith, Vernon Lomax

(Encyclopedia)Smith, Vernon Lomax, 1927–, American economist, b. Wichita, Kans., Ph.D. Harvard, 1955. He has taught at Purdue Univ. (1955–67), the Univ. of Massachusetts (1968–75), the Univ. of Arizona (1975�...

olivine

(Encyclopedia)olivine ŏlĭvˈēn [key], an iron-magnesium silicate mineral, (Mg,Fe)2SiO4, crystallizing in the orthorhombic system. It is a common constituent of magnesium-rich, silica-poor igneous rocks; metamorp...

Casa Grande

(Encyclopedia)Casa Grande käˈsä gränˈdā [key], city (2020 pop. 53,658), Pinal co., S Ariz.; inc. 1915. It lies in ...

Geronimo

(Encyclopedia)Geronimo jərŏnˈəmōˌ [key], c.1829–1909, leader of a Chiricahua group of the Apaches, b. Arizona. From his youth he participated in the forays of Cochise, Victorio, and other Apache leaders. Wh...

garnet

(Encyclopedia)garnet, name applied to a group of isomorphic minerals crystallizing in the cubic system. They are used chiefly as gems and as abrasives (as in garnet paper). The garnets are double silicates; one of ...

Tohono O'Odham

(Encyclopedia)Tohono O'Odham păpˈəgōˌ, päˈ– [key], Native North Americans speaking a language that belongs to the Uto-Aztecan branch of the Aztec-Tanoan linguistic stock (see Native American languages) and...

Levasseur, Émile

(Encyclopedia)Levasseur, Émile (Pierre Émile Levasseur) pyĕr āmēlˈ lüväsörˈ [key], 1828–1911, French economist. He was noted especially for his historical approach to the study of economics. He studied ...

Gleason, Henry Allan

(Encyclopedia)Gleason, Henry Allan glēˈsən [key], 1882–1975, American botanist, plant geographer, and plant ecologist. His floristic studies of North American vegetation led to his “individualistic concept o...