COR 



COT 



mono-petalous. A petal, like a sepal, 

 may be spurred, as in violet. Compare 

 Calyx. 



CO'ROLLARY. A corollary to a geo- 

 metrical proposition is a statement of 

 some truth, which is an obvious conse- 

 quence of the proposition. The term is 

 derived from the Latin corollarium, a 

 reward given to actors, champions, or 

 fencers, above their due. 



CORO'NA AUSTRA'LIS et BOREA'- 

 LIS. The Southern Crown and the 

 Northern Crown ; two of the old constel- 

 lations of Ptolemy, the former in the 

 southern, the latter in the northern 

 hemisphere. 



CO'RONATED {corona, a crown). 

 Crowned ; a term applied to spiral shells 

 •which have their whorls more or less 

 surmounted by a row of spines or tuber- 

 cles, as in the typical volutes, several 

 cones, mitres, &c. 



CORPU'SCULAR THEORY {corpus- 

 culum, a little body). A theory for ex- 

 plaining the nature of light. According 

 to this, the sun and all other luminous 

 bodies have the property of emitting cor- 

 puscles, or exceedingly minute particles 

 of their substance, with prodigious velo- 

 city. Hence it has been also termed the 

 Theory of Emission. See Undulatory 

 Theory. 



CORRO'SIVE SUBLIMATE. The 

 bichloride, formerly called the oxymu- 

 riate, of mercury. 



CO'RRUGATE [cum, with, ruga, a 

 wrinkle). Wrinkled; folded up in every 

 direction, as in the aestivation of the 

 poppy. 



CORTI'NA. A curtain ; a name given 

 to a portion of the velum of fungaceous 

 plants, which adheres to the margin of 

 the pileus in fragments. 



CORU'NDUM. A stone found in 

 India and China; it crystallizes in six- 

 sided prisms, which, from their hardness, 

 are termed adamantine spar. The ame- 

 thyst, ruby, sapphire, and topaz, are 

 considered as varieties of this spar, dif- 

 fering from one another chiefly in colour. 

 These are termed Oriental gems ; but the 

 names are applied to stones of other 

 countries. Jameson distinguishes three 

 species of corundum, the octahedral, the 

 rhomhoidal, and the prismatic or chryso- 

 beryl. 



CORVI'D^ (corvus, a crow). Corvine 

 birds, or Crows ; a family of the Insessores, 

 or of the Excur trices of Macgillivray, 

 including the crow, the raven, the mag- 

 pie, the jay, and other conirostral birds. 

 92 



CORVUS. The Crow; a southern 

 constellation, consisting of nine stars, 

 the principal of which is Algorab. It is 

 sometimes called Hydra et Corvus, the 

 Corvus resting on part of the body of 

 Hydra. 



CO RY'D ALINE. A vegeto-alkali, 

 found in the root of Corydalis bulbosa 

 and fabacea. 



CORYLA'CEiE. The Nut tribe of 

 Dicotyledonous plants, named from the 

 genus corylus, and comprising the oak, 

 the beech, the hazel, the hornbeam, and 

 the sweet chestnut. See Cupuliferce. 



CO'RYMB. A form of inflorescence, 

 in which the lower stalks are so long 

 that their flowers are elevated to the 

 same level as that of the uppermost 

 flowers. The expansion of the flowers of 

 a corymb is centripetal. See Fascicle. 



CO'RYMBOSE. That arrangement of 

 the ramifications of plants, in which the 

 lower branches or pedicles are so long as 

 to bring the leaves or flowers to the same 

 level as that of the upper ones. 



CO-SECANTS, CO-SINES, CO-TAN- 

 GENTS. These are the secants, sines, 

 and tangents, of arcs which are the com- 

 plements of those in question. See Trigo- 

 nometry. 



CO'SMICAL (koo-juoc, the universe). 

 A term opposed to acronychal, and, as- 

 such, denotes the rising or setting of a 

 star in the morning at the moment of 

 sunrise. The cosmical and acronychal 

 risings of a star are invisible to the naked 

 eye, because the light of the sun in the 

 horizon effaces that of the star. See 

 Heliacal. 



COSMO'GRAPHY {k6(t}xo^, the uni- 

 verse, '^pcKpbi, to describe). A description 

 of the system of the universe; a term 

 differing from Geography, as a whole dif- 

 fers from its part. The term should be 

 distinguished from cosmogony (yovrj, ge- 

 neration), which relates to the origin and 

 creation of the world ; and from cosmo- 

 logy (\670p, account), which treats of the 

 metaphysical philosophy of the constitu- 

 tion of the world. 



CO'TTON (kutun, Arab.). The hairy 

 covering of the seeds of several species 

 of Gossypium. The cotton-plant must 

 not be confounded with the cotton-tree 

 (Bombax), the cotton of which cannot be * 

 manufactured. 



COTYLE'DON (KOTvXndwv, a cavity). 

 The seed-lobe of a plant. Plants have 

 been distinguished, with reference to the 

 number of their cotyledons, into di- 

 cotyledonous, or those which have two 



