LIG 



INDEX. 



LIG 



63 



Lewis, Wm., analytical experiments of platina, xi. 97, ibid 

 Lexel, I. A., <* and y tauri occulted by the moon, xiii. 646 



— theorem for the solution of polygons, xiii. 647 



— periodic time of the comet of 1770, xiv. 485 



Leyden, on the epidemic at, in 16*69, i- 6l3, Sylvius 



Leyden bottle, see Electricity. 



Ley el, Adam, a dead body preserved in a copper mine, vii. 41 

 Lhwyd, Edward, of a fiery exhalation in "Wales, iii. 67 1 



— uncommon hail-storm in Monmouthshire, iv. 173 



— several figured stones in Wales, iv. 300 



— of a figured fossil stone found in Wales, iv. 381 



— difference in fossils of different countries, v. 123 



— large stones voided per urethram, v. 182 



— observ. on the natural history of Wales, v. 676, 677, 693 



— antiquities and natural history of Ireland, v. 674, 700 



— of plants growing in Cornwall, v. 702 



— natural history of Wales and Scotland, vi. 19, 73 

 Libella [libellula,] description of the, iv. 519, .. . Poupart 



— of Pennsylvania, description of, x. 4, 28, Bartram 



— see May Fly. 



Lichen, history of plants of this genus, xi. 246, . . . Watson 

 Liege, mineral of, sulphur and vitriol extracted from, i. 17 

 Liesganig, Father, astronomical observ. at Vienna, xii. 220 



— measurement of the meridian at Vienna, xii. 497 

 Life, on the probable duration of, x. 383, Kersseboom 



— on a table of the probabilities of, x. 598, . Braikenridge 

 — - differ, duration of, in towns and villages, xiii. 679, Price 



— chance of, from infancy to 26 years, xv. 1 22, .... Bland 



— see Annuities, Reversions. 



Light (in general) on the motion of, ii. 397* Romer 



— • on that produced by inflammation, xiv. <)^, .... Fordyce 



— of bodies in combustion, xv. 668, Morgan 



— on the comparative intensity of light from different lu- 



minous bodies, xvii. 359, Rumford 



— comparative production of light by wax, tallow, and oils, 



xvii. 373, , Same 



— on the chemical properties of, xviii. 378, Same 



— produc. of, by heat & attrition, xvii. 128, 2 15, Wedgwood 



— on the light spontaneously emitted from various bodies, 



xviii. 630, Hulme 



— analogy between sound and light, xviii. 604, .... Young 



— on the similarity in the nature of light and heat, xviii.692, 



748, Herschel 



Light (meteoric) a glade of, observ. in the Heavens, v. 288, 



Derham 



— a pyramidal appearance in the Heavens, v. 354, . . Same 



— of a remarkable lumen boreale, v. 486, Derham 



' — extraordinary lights in the air, vi. 213, 226, .... Halley 



luminousness in the air at Dublin, vi. 455, Percival 



— a glade of light, March, 1735, viii. 404, Bevis 



— red lights, Dec, 1737, at Naples, viii. 457, Pr. of Cassano 



, ■ ■ Padua, viii. 458, Poleni 



___——. Bononia, viii. 459* • • • Zanotti 



, — — Rome, viii. 460, Revillas 



_ — ■ ■ Edinburgh, ibid, Short 



„_ — • Sussex, viii. 46l, Fuller 



remarkable gleam from the sun, ix. 337, Collinson 



northern lights observed Feb., 1750, x. 54, . . . Huxham 



— a luminous appearance in the Heavens, xv. 114, Cavallo 



— observation of some luminous arches, xvi. 627, .... Hey 



— a luminous arch, Feb., 23, 1784, xvi. 630, . . Wollaston 



mm. . ibid, Hutchinson 



. . ■ xvi. 631, . . . Franklin 



h i '■ ' ibid, Pigott 



. — height of the arch seen Feb., 1784, xvi. 645, Cavendish 



— see Meteors, Aurora Boi ealis, &c. 

 Light, (natural history,) on the luminousness of the waters 



in the Indian seas, vi. 53, Bourzes 



Light, (electrical,) product, of thro' metal, v. 645, Hauksbec 



— from amber, diamonds, gum lac, v. 408, Wall 



— see Electricity, Phosphorus, Attrition. 



Light, (optics,) on the doctrine of, and of colours, i. 676, 



Grimaldi 



— and colours, experts, for his theory of, i. 678, Newton 



— propossals of experts, for Newton, & experts, made, i.714 



— animadversions on Newton's theory, i. 726, .... Parches 



— Newton's reply to the above, 1. 730 



— queries for experiments on his theory of light, i. 73 t 



— 2d letter of Pardies, i. 738 ; Newton's answer, 740 



— support of his theory against Hook, ii. 13 



— objections to Newton's theory, ii. 85, 94 ; reply 86, 91 



— and colours, nature of, ii. 146, Mayo 



— animad. on Newton's theory, ii. 175, Linus ; reply 176 



— optical observ. on the rainbow, ii. 222, Linus 



— further animadversions on Newton's theory, ii. 260 



— Newton's reply to Linus, and further explan. ii. 26l, 263 

 particular answer to Linus's objections, ii. 276 



■ exceptions against Newton's theory, ii. 334, .... Lucas 



— and diaphonous bodies, queries on, iii. 600, Halley 



■ on the refractions of fluids, v. 616, Hauksbee 



— experiments on light and colours, vi. 229, • • Desaguliers 



— experiment on the refrangibility of light, vi. 239, Same 



— different refrangibility of coloured, vi. 607, Desaguliers 



— colours of a secondary rainbow, vi. 624, .... Pemberton 



— different refrangibility of the rays, x. 390, Melville ; 

 remarks on the same, x. 390, Short 



— refrangibility of the rays of, x. 530, Clairaut 



— to remedy the defects in object glasses arising from the 

 different refrangibility of rays, xi. 267, Dollond 



— aberration of refracted light, xi. 514, .... Klingenstiern 



— refracted through a lens, aberrat. of, xi. 517, Maskelyne 



— of refracted rays reunited into a colourless pencil, xi. 718, 



Murdocfc 



— difficulties in the Newtonian theory removed, xiii. 65, 210, 



Horsley 



— refraction and velocity of the rays of, xv. 184, Wilson ; 

 account of this discovery by Mr. Wilson, 192, . . Note 



— comparative intensity of light from different luminous 

 bodies, xvii. 359, Rumford 



— loss of, in its passage through glass, xvii. 36'8, . . Same 



— on its inflection, reflection, and colours, xvii. 725, xviii. 

 196, Brougham 



— on the reflexibility of the rays of, xviii. 320, .... Prevost 



— a singular instance of atmosph. refrac, xviii. 337, Latham 



— powers of the prismatic colours to heat and illuminate, 

 xviii. 675, Herschel 



— refrangibility of the invisible solar rays, xviii. 688, Same 



— see Optics, Refraction, Object glasses, Colours. 



— (for all Sir I. Newton's papers on the subject, see Newton). 

 Light (phosphoric) from quicksiver, ix. 199, • • Trembley 



— articles which imbibe light, ix. 209, Beccaria 



— observations on phosphoric light, xv. 678, Morgan 



— produced by heat and attrit., xvii. 128, 215,. . Wedgwood 



— see Phosphorus, Electricity. 

 Lightfoot, Rev. John, biograp. account of, xv. 630, . . Note 



— an account of the reed wren, ibid 



— description of some minute British shells, xvi. 80 

 Lightning, nature of, ii. 146, Mayo 



— compared with phosphorus, ii. 651, Slare 



— caused by pyrites, iii. 16, Lister 



— effects of, vii. 104 Wasse 



— magnetism communicated by it, viii. 24, 25, . . Cookson 

 viii. 46'3, .... Bremond 



— cause of its angular shape, viii. 68, Logan 



— electrical experiments on the nature of, x. 212, Franklic 



— on the fusion of metallic bodies by, xi. 393, Mountaine 



