[ 522 ] 
L. 
Lettfom , John Ceakhy, Hiflory and DiiTe&ion of an extraordinay Introfufception 
p. 305. 
Light and Colour /, new experiments on the ocular fpedtra of, p. 313. 
Lightfoot, Rev. John , Account of fome-minute Britifh (hells, p. 160. The frefiv water 
Nautilus, ibid. The fountain Helix, p. 163, The tender prickly Helix, p. 16 6. 
The fine-ringed Turbo, p.167. The oblong frefh-water Patella, p. 168. 
^Liver of Sulphur, how made, p. 121. 
Longitude , a recommendation of the method of determining the longitude of places by 
obfervations of the Moo ids tranfit over the meridian, p. 409. 
Lyon, Rev. John, his account of a fubfidence of ground near Folkdone, p. 224. 
M. 
Magnets, experiments and obfervations on, p. 62. Small quantities of iron in metals may 
be fuppofed to be the caufe of their effctHog the needle, ibid. Experiments with 
Turkey done and nickel, p. 63 Method of hanging needles for the purpofe of 
making experiments, p. 64. Experiments on brafs, p. 67. Experiments on 
copper, p. 7 2. Experiments on zinc, ibid. Experiments on piatina, p. 73. Ob- 
fervations on the declination of the needle, p. 424. 
Magnifying QbjeSts, a new method or, p. 346. 
Males , on the exceE of their morcaliiy to that of females, 349. Why more fubjedt to 
mortality, p. 351. From growing to a larger fize in utero , p. 352. From the 
difeafes of great towns, p. 333. 
Majkelyne , Dr. improvements made in the zenith fe&or by him, p. 12. Advertifement of 
the expe&ed Return of the Comet of 1532 and 1661 in the Year 1788, p. 426. 
Marius , his villa near Arpino, in the province ot Abruzzo, converted into a convent 
of the order of La Trappe, p. 369. 
Mercury , experiments on its power of conducing heat, p 301. 
Mercury (Planet) obfervations on his tranfit over the fun’s difk. May 3, 1786, at Lou- 
vain, in the Auftrian Netherlands, by N. Pigott, p. 384, 
— ■ — — - by E. Pigott, p. 389. 
Meridian , method of finding the difference between Greenwich and York, p. 410. 
MeJJina , note of the prefen t date of, refpe&ing the earthquakes, p. 380. 
Metals , the properties of fome metallic fubdantes with refpeft to magnetifm, p. 6 2. 
Moon, Obfervation of the eclipfe of the moon, Sept. 10, 1783, at York and Paris, p, 
415. Hints for the more exadt obfervation of eclipies of the moon, p. 416, 
Mooring Rock , reafons for its being totally forgotten, p. 223* 
Mortality , on the excefs of, of males to females, p, 349, 
7 
Mural 
