Igneous
in geology, a term applied to all agencies, operations, and results which seem connected with, or to have arisen from, subterranean heat; and igwhich seem connected with, or to have neous rocks include the Volcanic, Trap- arisen from, subterranean heat; and ig- IGUANA Plutonic, pyrogenous, unstratified, and use the term igneous as synonymous with other similar terms. kind of luminous meteor, which flits about in the air a little above the sur- IGNIS FATUUS (ig'nis fä-tū'us), a face of the earth, and appears chiefly in marshy places, or near stagnant waters, summer. tern" and "Will-o'-th'-wisp." The most summer. Called also "Jack-with-a-lan- or in churchyards, during the nights of general opinion is, that it is due to the Called also "Jack-with-a-lanof some highly inflammable gas, given off by decaying organic matter. emanation and spontaneous combustion sia; succeeded his father Rurick, and, IGOR I. (ē'gor), a grand duke of Rusafter making war a long time against his IGOR I. (ē'gor), a grand duke of Rusneighbors, proceeded to ravage the East, gonia, and Bithynia. He left his throne deluging with blood Pontus, Paphlaembraced Christianity. He died in 935. to his wife Olga, who, in her old age, "people of the mountain," and the name