AMY 



ANA 



from their power of moving either back- 

 wards or forwards with equal facility. 

 The group is restricted to the warmest 

 parts of South America, 



11. Amphi-scians (o-zcid, shadow). A 

 designation of the people who inhabit the 

 torrid zone, and are so called because 

 they have their shadows at noon turned 

 sometimes one way, sometimes another, 

 or north and south — that is, to the north, 

 when the sun at noon is to the south of 

 their zenith, and vice versa. 



12. Amphi-spermium (o-Trepjiia, seed). A 

 term applied by Link to a pericarp which 

 is of the same figure as the seed it con- 

 tains. 



13. Amphi-stoma (arojua, the mouth). 

 A genus of suctorial parasitic worms, 

 which have pores, like mouths, at both 

 ends of the body. 



14. Amphi-tropal (rpoTro?, a turn). That 

 which is curved round the body to which 

 it belongs ; a term applied to tlie embryo 

 of the seed, when curved round the al- 

 bumen, so that its two ends are presented 

 to the same point. 



15. Amphi-tropoiis {TpoTTOi, z.i\xx\\). A 

 term applied to the ovule of plants, when 

 the foraminal and chalazal ends are 

 transverse with respect to the hilum. 



AMPLE'XICAUL {amplector, to em- 

 brace, caulis, a stem). Stem-embracing; 

 as applied to leaves which sheathe the 

 stem, as in many ranunculaceous plants. 



A'MPLITUDE {amplus, large). A 

 term applied, in astronomy, to the angu- 

 lar distance of a celestial body, at the 

 time when it rises or sets, from the 

 east or west point of the horizon. The 

 amplitude is measured by the arc of the 

 horizon intercepted between the east or 

 west point, and the centre of the celes- 

 ta tial body, at the period of its rising or 

 setting on any particular day. See 

 Horizon. 



Amplitude magnetic. A term applied 

 to the distances of the points of rising or 

 setting, from the east or west, as shown 

 by the compass. 



AMPULLA'RTNiE. Apple-snails; a 

 sub-family of the Turbidce, named from 

 the genus ampullaria : these animals 

 have a respiratory siphon ; the shell is 

 globular or turbinate. 



AMY'GDALE.E {diJ.vy&d\a, an al- 

 mond). The almond tribe of Dicotyledon- 

 ous plants, a sub-order of the Rosacese. 

 Trees or shrubs with leaves alternate ; 

 corolla polypetalous ; stamens perigynous ; 

 ovary superior, solitary, simple ; fruit 

 drupaceous. 

 23 



AMY'GDALIN {dfjivj6d\a, an almond). 

 A principle found in the bitter almond 

 and the berries of the cherry-laurel. By 

 the action of alkalies on amygdalin, an 

 acid is obtained called amygdalic acid. 



AMY'GDALOi'D {diJ.v^hdKa, an al- 

 mond, eibo^, likeness). One of the forms 

 of the Trap-rocks, in which agates and 

 simple minerals appear to be scattered, 

 like almonds in a cake. Such rocks are 

 termed amygdaloidal claystone, amygda- 

 loidal felspar, &c. Also, a compound 

 mineral, consisting oT lithomarge, green 

 earth, calc spar, steatite, and sometimes 

 hornblende, imbedded in greenstone or 

 wacke. 



A'MYL {aixvXov, tine meal, 'vKr\, matter 

 or principle). The hypothetical radical 

 of a series of amylaceous compounds, 

 generally considered as an alcohol, from 

 the analogy which exists between oil of 

 potatoes, or hydrate of oxide of amyl, and 

 ordinary alcohol, 



A'MYLIC ACID {amylum, starch). 

 A volatile acid, procured by digesting 

 moistened starch with peroxide of man- 

 ganese, 



AMYRIDA'CE^. An order of fra- 

 grant Dicotyledonous plants, named from 

 the genus Amyris. Trees or shrubs, with 

 leaves compound, with pellucid dots ; 

 corolla polypetalous ; stamens hypogy- 

 nous ; ovary superior ; fruit sub-drupa- 

 ceous, samaroid, or leguminous. 



ANACARDIA'CE^. The Cashew 

 tribe of Dicotyledonous plants, abound- 

 ing in a resinous, sometimes acrid, highly 

 poisonous juice. Trees or shrubs with 

 leaves alternate; flovjers usually uni- 

 sexual ; stamens perigynous ; ovary su- 

 perior ; fruit generally drupaceous. 



ANACOLU'THON ( uvaKoXov^f'o), 

 not to follow). A grammatical term, 

 denoting a want of sequence in the 

 parts of a sentence. It occurs when the 

 hitter part of a sentence does not agree in 

 syntax with the former, which sometimes 

 happens when a parenthetical clause has 

 intervened, so that the author has lost 

 sight of the construction with which he 

 set out. 



ANAI'MA (a priv., alfxa, blood). The 

 name by which Aristotle designated 

 those animals which have no red blood, 

 and which he therefore supposed to be 

 without blood. 



ANA'LCIME, A simple mineral of 

 the Zeolite family, also called cubizite, 

 of frequent occurrence in the trap-rocks. 

 It is found in grouped crystals deposited 

 by water, in the fissures of hard lavas. 



