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To pass; to enter. [Obs.] Light is discerned by itself because by itself it incurs into the eye. South.

ce to the sine of the angle of refraction. Thus the index of refraction for sulphur is 2, because, when light passes out of air into sulphur, the sine of the angle of incidence is double the sine of the angle of refraction. -- Index plate, a graduated circular plate, or one with circular rows of holes differently spac…

ile idleness or despair will increase them. We are more industrious than our forefathers, because in the present times the funds destined for the maintenance of industry are much greater in proportion to those which are likely to be employed in the maintenance of idleness, than they were two or three centuries ago. A.…

ient, inert substance. Reid. But there can be nothing like to this sensation in the rose, because it is insentient. Sir W. Hamilton.

one of an important class of integrals, occurring in the higher mathematics; -- so called because one of the integrals expresses the length of an arc of an ellipse.

axis, shows a series of concentric colored rings with a single black cross; -- so called because produced by the interference of luminous waves. -- Interference fringe. (Optics) See Fringe.

ny use the two-stroke cycle. They are almost universally trunk engines and single-acting. Because of the intense heat produced by the frequent explosions, the cylinders must be cooled by a water jacket (water-cooled) or by air currents (air cooled) to give the maximum thermodynamic efficiency and to avoid excessive fri…

A Rosicrucian; -- so called because avoiding declaration of his craft. [Obs.]

nge. -- Irish poplin. See Poplin. -- Irish potato, the ordinary white potato, so called because it is a favorite article of food in Ireland. -- Irish reef, or Irishman's reef (Naut.), the head of a sail tied up. -- Irish stew, meat, potatoes, and onions, cut in small pieces and stewed.

pproximately the same weight, and the continents stand higher than the ocean beds chiefly because the material of the crust has there less density.

type in which the letters do not stand upright, but slope toward the right; -- so called because dedicated to the States of Italy by the inventor, Aldus Manutius, about the year 1500. Italic languages, the group or family of languages of ancient Italy. -- Italic order (Arch.), the composite order. See Composite. --…

A Dominican friar; -- so named because, before the French Revolution, that order had a convent in the Rue St. Jacques, Paris.

The middle division of the small intestine, between the duodenum and ileum; -- so called because usually found empty after death.

r. Jesuits' bark, Peruvian bark, or the bark of certain species of Cinchona; -- so called because its medicinal properties were first made known in Europe by Jesuit missionaries to South America. -- Jesuits' drops. See Friar's balsam, under Friar. -- Jesuits' nut, the European water chestnut. -- Jesuits' powder, pow…

The third Sunday after Easter; -- so called because the introit is the 66th Psalm, which, in the Latin version, begins with the words, "Jubilate Deo."

osed by Scaliger, to remove or avoid ambiguities in chronological dates, and was so named because composed of Julian years. -- Julian year, the year of 365 days, 6 hours, adopted in the Julian calendar, and in use until superseded by the Gregorian year, as established in the reformed or Gregorian calendar.…

pider of the genus Salticus and other related genera; one of the Saltigradæ; -- so called because it leaps upon its prey.

species of large brown beetles of the genus Lachnosterna and related genera; -- so called because they begin to fly, in the northern United States, about the first of June. The larvæ of the June beetles live under ground, and feed upon the roots of grasses and other plants. Called also May bug or May beetle. -- June g…

A kind of wood common in Demerara, durable in salt water, because not subject to the depredations of the sea worm and barnacle.

loomy keeps. Hallam. I think . . . the keep, or principal part of a castle, was so called because the lord and his domestic circle kept, abode, or lived there. M. A. Lower.