[ 457 ] 
Leibnitz. Has attempted demonftrations of the law of refradllon from principles very 
different from Sir Ifaac Newton, p. 59. 
Lightning. Proceedings relative to the accident by, at Heckingham, p. 355. Letter 
from the Board of Ordnance to Sir Jofeph Banks, P. R. S. ibid. Extradls from the 
minutes of the Council of the Royal Society, p. 356. Report of the Committee to 
the Prefident and Council, p. 357. Defcripcion of the Houfe of induftry at Heck- 
ingham, ibid. Dimenfions of its principal parts, p. 359. Defcription of the 
conductors affixed to the chimnies, ibid. With their pofitions and refpedtive termi- 
nations, p. 360. et feq. Time and manner of the lightning’s fetting fire to the 
building, p. 366. Its effedt on different parts thereof, p. 367. et feq. Dimenfions 
and defcription of the liable, p. 370. et feq. Three balls of fire obferved to fall at 
the time of the accident, p. 377. The clouds at Norwich were negative on the day 
of the accident, ibid. 
Lloyd , George. See Rain. 
M. 
Magnefla , or muriatic earth. See Saline Sub/lances. 
Magnifying. See Optics , Telefaxes, Doubts. 
Marine acid air. See Saline Subjlances. Why it adls fo feebly on oil, fpirits of wine, 
&c. p. 236. 
Mayer , Mr. See Double Stars. 
Metallic Earths. See Inflammable earths. 
Meteorological Journal^ p. 28 £. 
Micrometer , the parallel wire one. See Lamp- micrometer. 
Mineral alkali. See Saline Subfiances. Mr. Turner, by a peculiar procefs, extrafts 
it in the greateft purity from common fait, p. 188. 
Mineral fubfances. Analyfis of two; viz. the Rowley-rag-flone and the Toad-flone, by 
William Withering, M. D. p. 327. Particulars concerning the cor.dudt of the 
procefTes explained, p. 328. See Roivley-ragfone, Toad f one. 
Moheau , Monf. His method of calculating the number of inhabitants in a place, 
without a numerical furvey, p. 39. 
Molineux. See Fixed Stars. 
Monoculus Polyphemus (or King-crab) Linnaei. A microfcopic defcription of the eyes of, 
by Mr. William Andre, Surgeon, p. 440. Has in reality four eyes, though they 
have been looked on as only two, ibid. Which are immoveable, p. 441. And 
confifl of two fmall and two large ones, ibid. Defcription of the large ones, p. 
442. And of the fmall ones, p. 443. 
Monfrous births. See Torlefe. 
More, Samuel. His account of fome fcoria from iron works, &C. p. 50. See Iron 
Works. 
Vol. LXXII. 
O o o 
Newton, 
