JEGO 



AER 



leaflets : the stamina have three capillary 

 filaments \v ith oblong 1 anthers ; the pistil- 

 lum is a turbinate germen ; no pericardi- 

 um ; the seeds are oblon , convex on one 

 side, grooved on the other, with the in- 

 ner valve of the corolla adhering- to it, and 

 not opening. There are six species. 



JEGINETA, in botany, a genus of the 

 Didynamia Angiospermia class and order : 

 calyx one-leafed, spathaceous; corolla 

 campanulate, two-lipped ; capsule many 

 celled : one species, viz. the JE. Indica, 

 found at Malabar. 



jEGIPHILA, goafs-friend, a genus of 

 the Tetrandria Monogynia class and or- 

 der, and the natural order of Vitices: the 

 calyx is a one-leafed permanent perianthi- 

 urn ; the corolla is one-petalled, and long- 

 er than the calyx ; the stamina are capil- 

 lary filaments, inserted into the mouth of 

 the tube ; the pistilium is a roundish su- 

 perior germ, style capillary, deeply bifid, 

 and stigmas simple ; the pericarpium is a 

 roundish two-celled berry, surrounded 

 with a permanent calyx ; and the seed is 

 either in pairs or solitary. There are se- 

 ven species, natives of the W. Indies, 

 chiefly of Jamaica. 



JEGLE,, in botany, a genus of the Poly- 

 andria Monogynia class and order : calyx 

 iive-lobed ; petals five ; berry globular, 

 many celled, with numerous seeds in each. 

 One species, viz. the marmelos, a tree 

 with thorny branches ; fruit delicious to 

 the taste, and exquisitely fragrant; seeds 

 imbedded in an extremely tenaceous 

 transparent gluten. 



JEGOPODUM, in botany, a genus of 

 the Pentandria Digynia class of plants, 

 the general corolla whereof is uniform ; 

 the single flowers consist each of five, 

 oval, concave, and nearly equal petals ; 

 the fruit is naked, ovato-oblong, striated, 

 and separable into two parts ; the seeds 

 are two, ovato-oblong, and striated, con- 

 vex on one side, and plain on the other. 

 There is but one species, viz. JE. poda- 

 graria, gout-weed, which is a perennial, 

 creeping weed, with white flow r ers, that 

 appear in May or June. It has been used 

 in cases of gout, whence it derives its 

 name. It is boiled for greens, and eaten 

 in Sweden; cows, sheep, and goats, eat it. 

 It is found among rubbish in shady places, 

 and in hedges. 



jEGOPRICON, in botany, a genus of 

 the Monandria Trigynia class and order : 

 the male Bowers are small, in an ovate 

 ament ; their calyx one-leafed ; no corol- 

 la, the stamina of one filament longer than 

 the ca!\ \, w : th an ovate amher ; the fe- 

 male flowers are on the same plant, and 



solitary ; the calyx and corolla are the 

 same as the male; the pistilium has an 

 ovate superior germ, three divaricate 

 styles, with simple permanent stigmas ; 

 the pericardium is a globular berry ; the 

 seeds are solitary, and angular on one 

 side. There is but one species, viz. JE. 

 betulinum, which is a tree very much 

 branched, with wrinkled bark and alter- 

 nate leaves resembling those of the myr- 

 tle. 



JEOLIPILE, a hollow metalline ball, 

 in which is inserted a slender neck or pipe; 

 from whence, after the vessel has been 

 filled with water, and heated, issues a 

 blast of wind with great vehemence. 



Great care should be taken, that the 

 aperture of the pipe be not stopped when 

 the instrument is put on the fire, other- 

 wise the jeolipile will burst with a vast 

 explosion, and may occasion no little mis- 

 chief. Dr. Plot gives an instance, where 

 the aeolipile is actually used to blow the 

 fire ; the lord of the manor of Effington. 

 is bound, by his tenure, to drive a goose 

 every New-year's day three times round 

 the hall of the lord of Hilton, while Jack 

 of Hilton (a brazen figure having the 

 structure of an zeolipile) blows the fire. 

 In Italy, it is said, that the seolipile is com- 

 monly made use of to cure smoky chim- 

 neys ; for being hung over the lire, the 

 blast arising from it carries up the loiter- 

 ing smoke along with it. 



An zeolipile of great antiquity, made of 

 brass, was lately dug up in the site of the 

 Basingstoke canal, and presented to the 

 Antiquarian Society in London. It is not 

 globular, with a bent tube, but in the 

 form of a grotesque human figure, and 

 the blast proceeds from the mouth. 



BOLUS'S harp, or EOLIAN harp, a mu- 

 sical instrument, so named from its pro- 

 ducing an agreeable harmony merely by 

 the action of the wind. See ACOUSTICS. 



JERA, a fixed pointof time, from which 

 any number of years is begun to be rec- 

 koned. See CHHONOLOGT. 



AEROSTATION, in the modern appli- 

 cation of the term, signifies the art of na- 

 vigation through the air, both in its prin- 

 ciples and ^practice. Hence also the ma- 

 chines which are employed for this pur- 

 pose are called aerostats, or aerostatic 

 machines ; and on account of their round 

 figures, air balloons. 



The fundamental principles of this arl: 

 have been long and generally known ; al- 

 though the application of them to prac- 

 tice seems to be altogether a modern dis- 

 covery. It will be sufficient, therefore, to 

 observe, in this place, that any body, 



