ARCTUEUS 



30 



ARISTOTLE'S 



line substance found in the leaves of the 



bear berry. 

 Arcturus, ( ark-tu'rus ). [Gk. arUos, bear; 



oura, tail.]=a Bootes. A reddish star of the 



first magnitude, which is also a sun-star and 



a parallax-star, in the constellation Bootes, 



near the tail of the Great Bear. 

 Ardea, (ar'de-a). [The Latin name.]=Heron: 



a bird belonging to Grallatores. 

 Ardeidae, (ar-di'dC). [Ardea, g.v.]=Herons: 



a family of birds of which the heron is the 



Ardisiacese, (ar-dis-i-a'se-e). Myrsinaceaj, q.v. 



Ardisiads, (ar-dis'i-adz). =Myrsinaceaa, q.v. 



Ardwick- lime stone, (ard'wik). [A. near 

 Manchester.] A sub-division of Upper Car- 

 boniferous rocks : contains remains of fish 

 and shells. 



Are, the unit of land -measure in the French 

 decimal system=100 square metres=119'6 

 square yards. 



Area, (a're-a). [The Latin word.] A plane 

 surface; also used for the measurement of 

 such a surface. 



Areca, (a-re'ka)=Aroca palm: a tree belonging 

 to Palmaceaa. A. catechu, bears the betel- 

 nut. 



Arenaceous foraminifera, ( ar-e-na'shS-os ). 

 Foraminifera having a test, formed entirely 

 of sand-grains in the place of a shell. A. 

 ?-oc/ls=Sand8tones, q.v. 



Arenicolites, ( a-re-ni-k51its ). [L. arena, 

 sand; colo, I inhabit: Gk. Uthos, stone.] 

 Fossil worm burrows found in sandstones. 



Arenig, (ar'e-nig)=Stiper stones, the lowest 

 of the Lower Silurian strata. 



Areola, (a-re'o-la). [Areola, the Latin word.] 

 Any small surface or space: especially used 

 in biology for small interstices and rings. 



Areolar tissue (a-re'o-lar). [Areola, q.v.]= 

 Connective tissue, q.v. 



Areometer, (a-re-om'et-er). [Gk. araios, thin; 

 nietron, measure.] An instrument for the 

 measurement of specific gravity, v. Araeo- 

 meter. 



Areometric method, ( a-re-o-met'rik ). [Gk. 

 araios, thin ; metron, measure.] Measure- 

 ment of the specific gravity of a solid body 

 by weighing it in a liquid. 



Arethusa, (a-re-thu'sa). [Classical.] One of 

 the Asteroids, No. 95. 



Arfvedsonite, (arf-ved'so-mt). A mineral be- 

 longing to the hornblende group, chiefly 

 silicate of iron. 



Argal, (ar'gal). 1. A sheep=0vis argala= 

 Ovis nahool. 2.=Argol, q.v. 



Argand lamp, (ar'gand). [M. Argand, the in- 

 ventor.] An oil lamp hav- 

 ing a tubular wick, and 

 clock-work machinery for 

 pumping up the oil. 



Argentic, ( ar-jen'tik ). [L. 

 argentum, silver.] Silrery; 

 containing silver: used of 

 the ordinary salts of silver. 

 v. Chemical nomenclature. 



Argentine, (ar-jen'tin). [L. argentum, silver.] 

 l.=Scopelus Humboldtii, q.v. 2. A white 

 variety of calcareous spar. 



Argand Lamp. 



Argentisatin, (ar-jen-tis'a-tin). [Argentum 

 and isatin, fl.v.J^CsI^AgNOo : a red amor- 

 phous substance obtained from argentic 

 nitrate and isatin. 



Argentite, (ar-jen'tit). [L. arrtentum, silver.] 

 Silver glance: one of the silver group of 

 minerals, chiefly subsulpliide of silver; a 

 common ore of silver. 



Argentous, (ar-jent'us). [L. argentum, silver.] 

 Containing silver, used of the sub-salts, v. 

 Chemical nomenclature. 



Argentum = Ag 7 = Silver : one of the Noble 

 II eta Is, q.v. 



Argil, (ar-jil). [The French word. ]= Pure clay. 



Argillaceous, ( ar-jil-la'she-us. ). [ F. argil, 

 clay.] = Clayey. A. rocks: clay rocks: con- 

 taining alumina. 



Argillite, (ar'jil-it). [F. argil, clay.] A rock 

 resembling clay-slate, but without its cleav- 

 age. 



Argol, (ar'gol) = Grade tartar=Potassic tar- 

 trate= Impure cream of tartar: found in all 

 wine casks. 



Argonaut, (ar'go-nawt). fGk. argo, Jason's 

 Ship; nautes, sailor.]=Paj>er nautilus: an 

 animal belonging to Cephalopoda, the female 

 only of which has a shell, shaped somewhat 

 like a boat. 



Argo-Navis, (ar'go-na'vis). [L. navis, ship.]= 

 The Ship Argo: one of the southern constel- 

 lations; also called Jason's Ship: sometimes 

 divided into four parts, contains one star of 

 first magnitude, Canopus; also a large ne- 

 bula. The star rj is a very variable star, 

 varying from first to sixth magnitude. 



Arguzise, (ar-gu'zi-e)=:Cordiace8e, q.v. 



Ariadne, ( a-ri-ad'ue ). [Classical.] One of 

 the Asteroids, No. 43. 



Aricine, ( a'ri-siu )=C23H2rN 2 O4=.Cinchona- 

 tine: a white crystalline base found in cin- 

 chona bark. 



Aries, (a'ri-ez). [L. aries, a ram.]=:Ram: the 

 first of the twelve signs 

 of the Zodiac: also one 

 of the constellations of 

 the Zodiac. The point 

 of intersection of the 

 celestial equator and "^^^^^^^B^^. 

 ecliptic is called the ^ 



first point of Aries, Aries, 



though it is now really in Pisces. 



Ariel, (a'ri-el). A satellite of Uranus. 



Aril, (ar'il). [F. arille, seed coat.] A cup-like 

 covering for seeds, in which only the lower 

 part is covered. 



Aristolochia, (ar-is-to-loTci-a). [Gk. aristos, 

 best; locheia, birth. ]=Birthwort: an herb 

 or shrub, often twining; named from being 

 used at childbirth, the type of Aristolo- 

 chiaceae. 



Aristolochiaceae, (ar-is-to-lo-ki-a'se-e). [Aris- 

 tolochia, q.v.] Herbs and shrubs, with axil- 

 lary apetalous flowers, belonging to Asarales; 

 resemble endogens in flowers, but exogens 

 in stems and leaves, found chiefly in tropical 

 America, &c. 



Aristotle's classification of animals, Zoa 

 (animals) are divided into Enaima (Verte- 

 brata) and Auaima (Invertebrata), Tha 



