[ 625 3 
lly Whyn Dykes, defcription of, p. 73, 88. Maffes, or rather veins, generally of a 
dark-brown (apparently bafaltic) matter, not untrequently containing bladder-holes, 
P. 89. 
l]y of the Hortus Malabaricus, Tabaflieer produced from, p. 273. See Tabajbeer. 
Indies, Eaft, Tabafheer much ufed in, p. 274. See Tabajbeer . 
Indigo much impovenfhes the land, and is unhealthy to the negroes, p. 358. By far the 
greateil part of fugar lands unlit for the culture of indigo, ib. 
Inflammable air. See Air* 
Journal, Meteorological, kept at the Apartments of the Royal Society, for January, 
1789, p. 2. -February, p. 4.— March, p. 6— April, p. 8.— May, p. 10.— June, p. 
12.— July, p. 14. — Auguft, p. 16.— September, p. 18 — October, p. 20.— Novem- 
ber, p. 22. — December, p. 24. 
Inland, various places in, their bearings and fixations, p. 78. 
Inn, on the precipitation of filver from nitrous acid by, p. 374. Iron precipitates 
copper from nitrous acid, p. 373. On the alteration which iron, or its furface, under- 
goes by the attion of a folution of filver in nitrous acid, or of a pure concentrated 
nitrous acid, p, 379. 
K. 
Ketr, James, Experiments and obfervations on the diffolution of minerals in acids, and 
their precipitations ; with an account of a new compound acid menftruum, ufeful in 
fome technical operations of parting metals, p. 339* 
Limbolton, in Huntingdonfhire, its latitude, p. 10 1* 
King’s Arbour, its latitude, longitude, &c. p. 232, 
L. 
Land-mark, a tower, its longitude weft of Greenwich determined, p. 390. Its latitude 
determined, ib. 
Lavas, weights of various fpecimens of, found in the ifland of Hay, p. 99. 
Lavender , called Nardus Italica by the Romans, p. 288. 
Leemoutb , its longitude weft of Greenwich determined, p. 390, Its latitude deter- 
mined, ib. 
Lemon trees deftroyed by fugar ants in the Weft Indies, p. 347. 
Light. Aurora borealis fuppofed to confift of parallel ftreams of light Ihooting upwards, 
which, by the laws of perfpe&ive, appear to converge towards a point, p. 103. 
Lightning, account of fome extraordinary effects of, p. 293. A field of Handing corn 
fet fire to by lightning, ib. An oak tree {truck by it, ib. A man, leaning againft the 
oak tree, ftruek dead by it, and his cloaths burnt, ib. Different fubftances fufed by 
lightning, p. 294. 
Lights, white, effentially ferviceable in rendering vifible the molt diftant ftarions for the 
great trigonometrical operation, p. 1 70. 
Lime trees, deftroyed by the fugar ants in the Weft Indies, p. 347. 
Vol.LXXX® 4 j\I 
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