HORDEACE.E 



170 



HOITND 



Hordeaceae, (hor-de-a'se-e). [Hordeum, q.v.] 

 "Wheat, rye, barley, &c.: a family of plants 

 belonging to Graminaceae. 



Hordein, (hor'din). [Hordeum, q.v.] An 

 alkaloid principle found in barley. 



Hordeum, (hor'de-um). [The Latin name.] 

 = Barley, q.v.: a variety of corn, used for 

 conversion to malt, belonging to Grami- 

 naceso: 



Horehound, (horliownd). A plant belonging 

 to Labiate). Black #.=Ballota. White H. 

 Marrubium. 



Horizon, (ho-rl'zon). [Gk. lioros, limit.] 

 Artificial H.: a sheet of mercury, or other 

 reflecting plane surface: used in astronomical 

 observations. Rational H.: a great circle of 

 the heavens parallel to the sensible H., but 

 passing through the centre of the earth. 

 Sensible H. = Visible H.: the line in which 

 the sky and earth seem to meet. 



Horizontal, ( hor-i-zon'tal ). [Horizon, q.v. ] 

 Parallel with the horizon, level, cf. Vertical . 



Horn, (horn). [The A. -S. word.] =. Keratin: a 

 tough, translucent, thickened variety of 

 epidermis, of which hollow horns, nails, 

 whalebone, tortoise-shell, feathers, hairs, 

 and scales are examples. H. 6eam=Carpinus 

 betulus. H. bill, v. HornbilL H. bil'*, 

 v. Hornbills. H.-blende, v. Hornblende. H. 

 6ttf7=Stag beetle=Lucanus cervus. H. eel= 

 Ammodytes tobianus. H. y&/t=Belone vul- 

 garis. H. lead Phosgenite. H. poppy 

 Glaucium. H. quicksilver Calomel. II. 

 silver = Kerargy rite. //. wort = Ceratophy 1- 

 lum. H. wors=Cojtophyllaceae. 



Hornan= Pegasi. 



Hornbill=Buceros, q.v.: an African building 

 bird. 



Hornbills=rBucerids3=. Large 

 crow-like birds, with enor- 

 mous coloured bill. Both 

 sexes alike; nest in hoi- 

 low trees. 



Horns. 1. Hollow II. = ," 

 Bony extensions attached 

 to the frontal bone of all 

 ruminant animals, ex- 

 cept camels and musk 

 deer ; found in all males, 

 in females only occasion- 

 ally. 2. Bony H. = Ant- 

 lers: usually branched, 

 and shed annually. Pro- 

 bably the result of an excess of nourish- 

 ment ; larger in cold, and smaller in warm 

 countries. 



Hornblende, (hornljlend). [Horn and Blende, 

 .v.]=Amphibole: found in syenite, basalt, 

 porphyry, and other rocks: a silicate and 

 aluminate of magnesium, calcium, and iron. 

 H. group of minerals: includes amphibole, 

 pyroxene, asbestos, augite, &c. H. schist: 

 one of the metamorphic rocks. 



Horned, (hornd). [Horn, q.v.] Having horns. 

 H. Ao,<7=Babiroussa, q.v. H. tar=AIauda 

 penicillata. H. pheasant =Ceriornis Blythii. 

 H. pond-weed = Zannichellia. H. poppy= 

 Glaucium. H. ray = Cephaloptera giorna; 

 belongs to Batides. H. tragopan=Tragop&n 



HornbilL 



satyrus. II. vipers Aourthophia cerastinus= 

 Cerastes: a viperine snake of Africa. 



Hornet, (hor'net). [Hyrnet, the A.-S. name.] 

 =Vespa crabro, a social wasp, feeds on in- 

 sects. H. 6eee=iQuedius fulgidus. //. Jly 

 =Asilus. H. moth, v. Sphingidje. 



Hornitos, (hor'ni-tos). [The Spanish word.] 

 A variety of mudspring. 



Hornsilve'r. A variety of kerate, q.v. Chiefly 

 chloride of 8ilver=Cerargyrite. 



Hornstone. A mineral, chiefly silicate of iron, 

 aluminum, magnesium, <fec. 



Horn-wort=Ceratophyllum, q.v. 



Horn-worts=:Ceratophyllacea3, q.v. 



Horny-matter=Keratin=Horn, q.v. 



Horograph, (ho'ro-graf). [L. hora, hour; gra- 

 pho, I write.] Any instrument for marking 

 the time. 



Horologium, ( hor-o-lo'ji-um ). [The Latin 

 word .]= The CJ oc k : a Southern Constellation. 



Horology, (hor-ol'6-ji). [Gk. hora, hour; logos, 

 discourse.] 1. The science of the measure- 

 ment of time. 2. The art of constructing 

 chronometers and time-measurers generally. 



Horrox, (hoi'roks). [Mr. Horrox, 1639.] In 

 moon, q.v. 



Horse, (hors). [Ilors, the A.-S. name.]= 

 Equus caballus : an animal belonging to 

 Equidze, all varieties of which are probably 

 derived from one species: can endure ex- 

 tremes of heat and of cold, but not of humi- 

 dity. In the humid region between Bengal 

 and Japan no full-sized horse is known, v. 

 Ungulata. Fossil H., : Anchitherium, 

 Equus, Hipparion, Hippotherium. Little H. 

 =Equuleus, q.v. Sea II . = Trichechus ros- 

 marus. //. ant r=Formica rufa, named from 

 its large size. H. chestnut=Msculua hippo- 

 castanum. //. chestnut of America=^Escu- 

 lus ohiotensis. //. /s/i=Hippocampus, q.v. 

 H. ^y=Tabanus; also=Hippobosca equina. 

 //. latitMdes=Calm-belt of Cancer, between 

 30 and 35 N. latitude. H. poioer: now de- 

 scribes size only of steam engines. Properly 

 =33 "000 Ibs. raised one foot against gravity 

 in one minute, v. Horse-power. //. radish 

 =Hyperanthera moringa ; also=Cochlearia 

 armoracia = Armoracia. H. tail; 1. = Equi- 

 Bctuni, q.v.; 2.=Hippuris. H. tails=K<i\u- 

 setacefe, q.v. H. stingers = Dragon flies= 

 Libellulae. 



Horse-flesh ore. A variety of Erubescite, an 

 ore of copper. 



Horse-power. In Britain = 550 Ibs. raised 

 one foot per second ; in France = 75 kilo- 

 grammes raised one metre in a second. The 

 two are nearly equal. 



Horse-shoe. H. bat = Vespertilio ferrum- 

 equinum. //. crab = Limulus Moluccanus. 

 H. magnet=A. magnet shaped like a horse- 

 shoe, so that the poles are brought close to- 

 gether. H. vecfe=Hippocrepis. 



Hotsprings. v. Geysers. 



Hottentots, (hot'n-tots). A S. African people. 



Hottonia, (hot-to'ni-a). [P. Hotton, a Dutch 

 botanist.] = Water violet: a floating herb, 

 belonging to Primulacesc. 



Houlds worth's pyrometer, v. Pyrometer. 



Hound, (hownd). [Uund, the A.-S. name.] 



