ELEMENTS 



114 



EMBRYOLOGY 



A native rich alloy of gold or silver. 2.= 

 Succinite. 



Elements, (el'e-ments). [ Elementum, the 

 Latin name.] The constituents of a com- 

 pound; also used for those chemical sub- 

 stances which cannot be decomposed by any 

 known means. Electro-positive E. ; those 

 which go to the negative pole in chemical de- 

 composition by electricity. Electro-negative 

 E.: those which go to the positive pole. 



Elemi, (el'e-mi). An odoriferous resin, ob- 

 tained from Icica and other plants. 



Elephant, (el'e-fant). [Elephantus, the Latin 

 name.] = Elephas: a thick-skinned quadru- 

 ped, forming a distinct order, Proboscidea, 

 q.v., of Mammalia: has no canine teeth, and 

 the incisors become tusks; has very long pre- 

 hensile nose called a trunk. E. fish=Ca\lor- 

 hynchus antarctica. E.'s <us=Dentalium 

 arcuatum: a tooth-shell. Sea E.=A. large 

 seal=Morunga proboscidea E. HcMokmoth= 

 Chserocampa elpenor. E. s7irew;=:Macrosce- 

 lides typicus. 



Elephantiasis, ( el-e-fan-ti'a-sis ). [Elephant, 

 q.v.] 1. A diseased condition of the skin, 

 in which it becomes very thick. 2. A, dis- 

 ease of the leg, which becomes enormously 

 thickened. 



Elephas, (el'e-fas). [The Latin name.]=Ele- 

 phant, q.v. E. Africanus= African elephant. 

 E. Indicus = Asiatic elephant. E. primi- 

 <7enms=Mammoth. 



Elimination, (e-lim-in-a'shun). [L. elimino, 

 I remove.]=Removal or separation: especi- 

 ally used in algebra for the removal of two 

 equal terms from an equation. 



Eliquation, ( e-lik-wa'shun ). [L. eliquo, I 

 strain.] The separation of two solid sub- 

 stances by the melting of the more fusible. 



Elizabethan architecture, ( S-liz'a-beth-an ). 

 [Queen Elizabeth.] A compound of Gothic 

 and Italian architectures. 



Elk, (elk). [Sleh, the A.-S. name.]=Cervus 

 alces= Moose: an herbivorous mammal with 

 short neck, long legs, and large horns. 



Ell, (el). [Eln, the A.-S. name.] A measure 

 of length. Flemish E.=3 quarters of a yard. 

 English E.=5 quarters. French E.=6 quar- 

 ters. 



Ellagic acid=zCi4HgOg : a crystalline powder, 

 obtained from gall-nuts, having weak acid 

 properties, and forming a constituent of some 

 bezoars; also called bezoaric acid. 



Ellipse, (el-lips'). [Gk. elleipsis, defect.]= 

 Parallel projection of a 

 circle: ono of the conic 

 sections: a curve in which 



. the distances of any point 

 from the two foci have 

 always the same sum. Ellipse. 



Ellipsoid, (el-lip'soid). [Ellipse, q.v.; Gk. 

 eidos, form.] A solid figure, formed by the 

 revolution of an ellipse about its axis; any 

 plane section of which is an ellipse or a circle. 



Elliptical, (el-lip'ti-kal). [Ellipse, q.v.] Be- 

 longing to or resembling an ellipse. E. 

 polarization: in which the vibrations are 

 elliptical, in planes perpendicular to the 

 direction of the ray. v. Polarization. 



Ellipticity, (el-lip-tis'i-ti). [Ellipse, Q.V.] The 

 deviation of an ellipse from a circle, expres- 

 sed by the excess of the longer diameter over 

 the shorter, if one be 5 aad the other 3, the 



Elm, (elm). [TheA.-S. name.]=Ulmus:atree, 



with small flowers 



and hard timber, the 



type of Ulmaceoe. 

 Elmo's fire. v. St. Elmo. 

 Elongation, (e-long-a/- 



shun). [L. e, from; 



longus, long.] The 



distance of any hea- ,~ 



venly body from the 



sun, as seen from the 



earth. 

 Elonichthys, ( el - o - : 



nik'this). [Gk. helos, x 



marsh; ichthys, fish]. Elm. 



A fish belonging to -Lepidoganoidei. 

 Elutriation, (e-lu-tri-a'shun). [L. clutrio, I 



wash out.] The separation, by washing of 



the lighter portions of a powder. 

 Elvanite, (el'va-nit). [Celt, el, rock; van, 



white. ] A granitic rock, white when exposed 



to the weather, found in the form of dykes 



in Carboniferous rocks. 

 Elytra, (el'i-tra). [Gk. elytron, covering.] 1.= 



Imbricated plates or scales. 2. = Front wings 



of Coleoptera, which are covered by scales. 

 Elytron, (el'i-tron). [Gk. elytron, covering.] 



Singular of Elytra. 

 Elytrum, (el'i-trum). [Gk. elytron, covering.] 



The first pair of wings in beetles, which are 



hard, and cover the second pair. 

 Embolite, (em'b5-lit). [Gk. embolon, wedge.] 



A mineral, chiefly chloro-bromide of silver. 

 Embossing, (em-bos'sing). Covering wood, 



paper, cloth,&c., with ornamental raised work. 

 Embrasure, (em-brii'zhur). An opening in a 



wall, usually with 



sloping sides, for 



the fire of a gun, 



or a window. 

 Embrithrite, (em- 



brith'rit). A mine- 



ral, chiefly sulphide 



of antimony and 



lead. 

 Embryo, ( em'bri-o ). Embrasure. 



[Embryon, the Greek word.] The earliest 



stage of a young animal , before it is sufficiently 



advanced to be termed a foetus: consists of 



three layers. 1. The outer, which becomes 



developed into nerves, muscle, and bone. 2. 



The medial, which forms the heart and cir- 



culating system. 3. The inner, which be- 



comes the alimentary system. Naked E. = 



Spore. E. in a- receptacle=See<l. E. of 



man: at first resembles all other embryos of 



plants and animals; successive differentia- 



tions limit it consecutively to animals, ver- 



tebrata, mammalia, placental mammalia, 



quadrumana, and man. 

 Embryology, (em-bri-ol'5-ji). [Embryo, q.v.] 



The science of the successive modifications 



through which any organism passes in its 



