CON 



CON 



Alluvial strata, which include calcareous 

 and other deposits from springs, stalac- 

 tites, travertines, bog iron -ore, and salt. 



CONCU'RRENTS. Common years con- 

 sist of 52 weeks and 1 day, and Bissex- 

 tile years consist of 52 weeks and 2 days. 

 The day or two days supernumerary are 

 called Concurrents, because they concur 

 ■with the Solar Cycle, whose course they 

 follow. The first year of this cycle is 

 termed Concurrent 1, the second 2, the 

 third 3, the fourth 4, the fifth 6 (instead 

 of 5, because that year is bissextile), the 

 sixth 7, the seventh 1, the eighth 2, the 

 ninth 4 (instead of 3, because that year 

 is likewise bissextile), and thus, with the 

 other years, always adding one in com- 

 mon years, and 2 in bissextile years ; and 

 always recommencing with 1 after having 

 reckoned 7, because there are no more 

 than 7 Concurrents, — that being the 

 number of days in a week and of the 

 Dominical Letters. 



CONDENSATION {condenso, to thick- 

 en). The act of diminishing the bulk of 

 a body, by compression, as in the conver- 

 sion of gases into liquids, of liquids into 

 solids ; or by cold, as in the conversion 

 of steam into water. 



CONDE'NSER {condenso, to thicken). 

 1. A vessel in which steam is condensed, 

 or converted into water, by the applica- 

 tion of cold. 2. An apparatus used for 

 detecting the presence of electricity, by 

 collecting and condensing it before it 

 gains a sufficient degree of tension to 

 affect the electroscope. Its action de- 

 pends on the induction of electricity, and 

 on this being held in a latent state. 



CONDENSING SYRINGE. A hollow 

 metallic cylinder, furnished with a pis- 

 ton, piston-rod, and receiver, for increas- 

 ing the density of air in a given space. 



CONDITIONAL PROPOSITION. In 

 Logic, a proposition which asserts the 

 dependence of one categorical proposition 

 on another. A conditional syllogism is 

 one in which the reasoning depends on 

 such a proposition. 



CONDU'CTION {conduco, to bring 

 •with). A term expressive of that pro- 

 perty by which certain bodies transmit 

 heat, or electricity, through their sub- 

 stance. The rate at which this equaliza- 

 tion'is effected in any body is the measure 

 of its conducting power ; and substances 

 are, accordingly, divided into good and 

 had conductors with reference to this 

 power. 



CONDUCTORS METALLIC. A term 

 applied to long metallic rods, whose 



points are raised above buildings for the 

 purpose of attracting or receiving the 

 electric fluid, and of conducting it into 

 the earth, or into water, thereby to pre- 

 vent such buildings from being struck 

 by lightning. 



CONDU'RRITE. An ore of copper 

 found in a vein in Condurrow mine, in 

 Cornwall. 



CONDYLO'PODA {KovhvXo^, a joint, 

 TToup, 7ro36f, a foot). Articulated animals 

 with jointed legs, as insects, crabs, and 

 spiders. 



CONE (Kwi/of, a cone). A geometri- 

 cal solid, with a circular base, tapering 

 equally upwards until it terminates in a 

 vertex or point. A right line drawn from 

 the vertex to the centre of the base, is 

 termed the axis of the cone. When this 

 axis is at right angles to the base, 

 the solid is termed a right cone; if 

 otherwise, it is an oblique, or scalene 

 cone. 



CONE, in BOTANY. The fruit of 

 the Coniferae, or Fir-tribe of plants, con- 

 sisting of a conical amentum, of which 

 the carpels are scale-like, spread open, 

 and bear naked seeds. 



CONE OF RAYS The rays of light 

 which fall from a luminous point upon a 

 given surface, as upon the object-glass 

 of a telescope. 



, CONE'NCHYMA {kS,vo<!, a cone, g-yx^- 

 fxa, infusion). A terra applied by Mor- 

 ren to that form of parenchyma in plants, 

 which is conical, as in hairs. 



CONFERViE. A section of Algace- 

 ous plants, consisting of simple tubular 

 jointed species inhabiting fresh water. 



CONFLA'TION {conflo, to blow to' 

 gether). The process of casting or melt- 

 ing of metals. 



CO'NFLUENT {confluo, to flow toge- 

 ther). Growing together; a term syno- 

 nymous with connate, expressive of the 

 cohesion of homogeneous parts. 



CONFO'RMABLE. A term applied 

 in Geology to the planes of one set of 

 strata which are parallel to those of an- 

 other set which are in contact with them. 



CONGELATION {congelo, to freeze). 

 The passing from a fluid to a partially or 

 wholly solid state, by the agency of cold. 



CO'NGENER. That which is of the 

 same kind; a term applied to species 

 which belong to the same genus. 



CONGLO'MERATE {conglomero, to 

 heap together). Puddingslone. Rounded 

 water- worn fragments of rock or pebbles, 

 cemented together by another mineral 

 substance, which may be of a silicious, 



