AER 



JEoLopiLE, from JEolus (q.v.), 

 a passage. A hollow metal ball, with a 

 email hole into which a slender pipe is 

 fitted : the ball being half- filled with water 

 and heated, vapour issues vehemently 

 from the orifice. It is used principally to 

 show the convertibility of water into 

 steam, but was anciently used as bellows 

 and is still sometimes used as a blow-pipe. 



JEoLorno.v, from JEolus. the god of the 

 winds, and $ur>,. voice. The name of a 

 musical instrument somewhat resembling 

 a cabinet pianoforte in shape, &c. Its 

 tones are produced by metallic springs, 

 et in vibration by the air produced from 

 bellows. 



Moy, from ,w. a?e. duration, ^.tcrm 

 used in the Platonic phiioo;:h;~ to desig- 

 nate a virtue, attribute, or perfection. 

 The PlatonLsts represented the J.'^ty as 

 an assemblage of teons. The Gnostics 

 considered aont as certain substantial 

 powers, of divine natures, emanating 

 from the Supreme Deity, and purfo?ming 

 various parts in the operations of the 

 universe. 



AERATE, from aer. To aerate, is to im- 

 pregnate with carbonic acid, formerly 

 called aerial acid ; e. g. aerated water. 



AEBA'TION, from <{, air. The satura- 

 tion of a liquid with some gas; e.g. the 

 aeration of water with carbonic acid or 

 fixed air. 



AERIAL, Lat. aerhis. In painting, the 

 term is applied to the diminishing in- 

 tensity of colour on objects receding from 

 the eye. 



AERIAL PLANTS, a general name for such 

 plants as derive their nourishment chiefly 

 from the atmosphere, e.g. the epidendra, 

 aerides, &c. These are often, especially in 

 the East, suspended by a string in a room, 

 as ornaments, and continue to blossom 

 even for months, without earth or water. 



AEKIANS. In church history, a branch 

 of Arians who take their name from 

 Aerius, who maintained that there was no 

 difference between bishops and priests. 



AE'BIPES. air-plants. A genus of per- 

 ennials of four species, natives of China 

 and the East Indies. Class gynandria, 

 order monandria. Name, /> and udog , 



AERIFICATION, from air, air, and facio, 

 to make. 1. The act of passing from a 

 liquid or solid state into gas or elastic 

 vapour. 2. Being filled with air. 



AERIFORM, from aer, air, and forma, 

 form. Having the nature and properties 

 of air ; e. g. the gases are aeriform, fluids. 



AERO-DYNAMICS, from '<, air, and 

 fi'taujt, power. That department of ex- 

 Deamental science which treats of the 

 motion of ait and the mechanical effects 

 t &ir in motion. 



AZXUGBAPHY , from &., air, an 



I JESC 



to describe. A description of the atmo- 

 sphere, its nature, &c. It includes me- 

 teorology. 



AEB'OLITE, from a^j, air, and A<0f, 

 a stone. A meteoric stone. See METEOR- 



OL1TE. 



AERO'LOGT, from ify, air, and Xeye;, 

 science. That branch of physics which 

 treats of the nature and properties of the 

 atmosphere as regards its salubrity. 



AEROLCM, an ancient weight, equal to 

 the sixth part of an obolus, or about 2 grs. 

 It was the same with the Greel 



AEROMEL, from aer, and mel, honey. 

 Manna (mel aereuni), which was believed 

 to descend like dew from ;,he atmosphere. 

 It was also called $ootro{jt.i},i,tnelroscidtim, 

 or honey-dew. 



AEROMETER, from ajj, air, and f/.ir^on, 

 measure. 1. An instrument for ascertain- 

 ing the weight or density of the atmo- 

 sphere. 2. An instrument for ascertain- 

 ing the relative bulk and density of the 

 gases. 



iER'oMETRT,from ctfy, air, and ftirgw, 

 measure. 1. That branch of aerography 

 which considers the pressure, elasticity, 



and rarefaction of the air. 2. The art 



of measuring the relative bulk and density 

 of gases. 



AERONAUTICS, the science of navigating 

 the air in balloons. See AERONAUT. 



AEROPHOBIA, from aijj, air, and $oa;, 

 fear. Dread of wind ; symptomatic of 

 hydrophobia, and occasionally observed 

 in hysteria and phrenitis. 



AEROPHTTES, from etr,{ t air, and fvroi, 

 a plant. Plants which live exclusively in 

 air, in distinction to hydrophytes, which 

 live under water. 



AEROSTAT, from i^, air, and o-Ttvroc. 

 ustaining. An air-balloon, a fire-balloon. 



AEROSTA'TICS, from cc.r,g, air, and i-rctros, 

 sustaining. 1 . The same with aerosta tion , 



(q. v.) 2. The same with pneumatics, 



(q. v.) 



AEROSTA'TION, from <*, air, and rryM, 

 to weigh. The art of raising, suspending, 

 and latterly, of guiding balloons in the 

 air. Primarily, the word signified the art 

 of weighing air or aeriform fluids, but is 

 now used synonymously with aeronautics, 

 (q. v.), though not very correctly. 



JERroo, primarily, the rust of brass 

 (tes) , latterly, verdigris. The linintentum 

 fiinis of the London Pharmacopoeia, 

 corresponds with the old mel JEgyptiacum, 

 or orymel asmginis. 



Xs, the Latin word for brass. Among 

 the Romans, <es meant coined money, in 

 contradistinction to ess grave, money paid 

 by weight. 



JESCULACE.E, a natural order of ex%fc 

 nous plants, consisting of the horse-cbfl* 



