E T I 



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E X O 



from its being cribriform, or perforated 

 like a sieve, for the passage of the olfac- 

 tory nerves. 



E'TIOLATE. (ttioler, Fr.) To blanch by 

 concealing from the light. 



ETIOLA'TION. The becoming white or 

 blanched by concealment from light. 

 Thus the inner leaves of lettuces and en- 

 dive are made white by being tied up, 

 and celery is blanched by being earthed 

 up. 



E'TITE. See JEtites. 



E'TYUS. A genus of crustaceans, some 

 species of which have been discovered in 

 the gait. 



EU'CLASB. (from tv and \aw, Gr.) The 

 Prismatischer Smaragd of Mohs. Prisma- 

 tic Emerald. This stone has obtained 

 its name from the ease with which it is 

 broken. It is a rare and beautiful mi- 

 neral, and was brought first from Peru 

 by Dombey ; it was at first confounded 

 with the emerald, in consequence of its 

 green colour. The primitive form of its 

 crystals is a rectangular prism, whose 

 bases are squares. It is of sufficient hard- 

 ness to scratch quartz. Its constituents 

 are silica, alumina, glucina, and the ox- 

 ides of iron and tin. 



EUDI'ALITE. A mineral of a brownish-red 

 colour, having an octohedral cleavage. 



EUKAI'RITE. Cupreous seleniuret of sil- 

 ver, consisting of silver 39, selenium 26, 

 copper 23, alumina 8. 



EUO'MPHALUS. A univalve unchambered 

 fossil shell, found in the mountain lime- 

 stone. 



EU'PHOTIDE. ) Names given by the French 



EU'PHOTITE. ) mineralogists to Saussu- 

 rite. 



EU'PODA. The name given in Cuvier's 

 " Regne Animale " to the fifth family of 

 Tetramerous Coleoptera ; Eupoda com- 

 prises two tribes, Sagrides and Crioce- 

 rides. 



EU'RITE. White-stone, the weiss-stein of 

 Werner. A variety of granite in which 

 felspar predominates, and named Eurite 

 by the French mineralogists. It occurs 

 in beds, in common granite, in Cornwall. 

 In its most compact form, it becomes a 

 porphyry, and is closely allied to volcanic 

 rocks in Auvergne ; felspathic granite. 

 Bakewell. 



EURI'TIC. Containing eurite ; composed 

 of eurite ; resembling eurite. 



EXCANDE'SCENCE. (excandescentia, ex- 

 candesco, Lat.) White heat; extreme 

 heat. 



E'XCAVATE. (excavo, Lat. excaver, Fr.) 

 To hollow out; to dig out; to make 

 hollow. 



EXCAVATION. (excavatio, Lat. excavation, 

 Fr.) A cavity ; a hollow formed by the 

 removal of a portion of the interior. 



E'XCBNTRICITY. (excentricitt , Fr. eccen- 

 tricita, It.) Deviation from circular 

 form. 



EXCE'RN. (excerno, Lat.) To excrete; 

 to separate and emit through the 

 pores. 



EXCE'RNED. Excreted. 



EXCO'RIATED. (from excorio, Lat. exco- 

 rite, Fr.) Abraded ; deprived of its cuti- 

 cle or external covering. 



EXCORIA'TION. (excoriation, Fr. exoria- 

 zione, It.) The state of being deprived 

 of its cuticle, or external natural cover- 

 ing. 



EXCO'RTICATED. Deprived of its bark. 



EX'CREMENT. (cxcrementum, Lat. excri- 

 ment, Fr. escremento, It.) That which 

 is separated from the aliment after diges- 

 tion and is to be ejected downwards from 

 the intestinal canal ; faecal matter ; ex- 

 creted matter. 



EXCREMKNTI'TIOUS. (excrtmenteux, Fr. 

 escrementoso, It.) Containing excre- 

 ments ; consisting of excreted matter. 



EXCRESCENCES (from excresco, Lat. ex- 

 croissance, Fr. escrescenzo, It.) A pre- 

 ternatural growth of any substance ; a 

 body growing upon, or out of, another 

 in an unnatural manner ; a deformity. 



EXCRE'SCENT. Growing out of another 

 body preternaturally. 



EXCRE'TE. (from excerno, Lat.) To 

 throw off by excretion. 



EXCRE'TION. (excretio, Lat. excretion, 

 Fr. escrezione, It.) 



1. The act of separating and voiding ex- 

 crementitious matter from the blood and 

 food. 



2. The substance excreted. 

 EXCRE'TORY. (excrttoire, Fr. escretorio, 



It.) Organs which have the power of 

 excreting. 



EXFO'LIATE. (exfolier, Fr.) To separate 

 in laminae or scales. 



EXFOLIA'TION. (exfoliation, Fr.) The 

 process of separation of dead bone. 



EXHALA'TION. (exhalatio, Lat. exhalai- 

 son, Fr. esalazione, It.) A vapour from 

 animal or vegetable substances. 



EXHA'LE. (exhalo, Lat, exhaler, Fr. esa- 

 lare, It.) To breathe out in vapours or 

 fumes ; to emit odours ; to give out 

 effluvia. 



EXHUMA'TION. (exhumation, Fr. esuma- 

 zione, It.) The digging out of the ground 

 what has been buried therein. 



EXHU'ME. (exhumer, Fr.) To dig out of 

 the earth what has been buried. 



EXHU'MED. Disinterred. 



E'XOGEN. Exogens are plants which have 

 a pith in the centre of their stems, not 

 descending into the roots ; or having 

 their woody system separated from the 

 cellular, and arranged in concentric 

 zones. They increase by additions to the 



