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Meridian, standard, i. 563.

Metallic contact, accidental discovery of the
effects of, i. 363.

Metallic pistons, ii. 485.
Metallic reflectors, i. 265.
Mines, the drainage of, ii. 441.

Meteor at Dreux and Mantes in France, i.
601; meteor seen and described by Pel-
tier, i. 602; meteor of November, 1833, i.
466; of August, 1838, i. 469.
Meteoric phenomena, various instances of,
i. 474.

Meteoric stones and shooting-stars, i. 459–
474.

Micrometer, description of, ii. 352.
Micrometer-screw, ii. 293.
Micrometric wire, ii. 24.

Milky-way, the, ii. 378.

Minor planets, the, i. 143-156.
Molecules, or atoms, ii. 22.
Moon, the, i. 307–322.

Moon and the weather, i. 405–420.
Moon's influence on the tides, i. 212; on
the weather, i. 315.

Moonlight, ii. 193; physical qualities of, i. 312.
Motion of comets, i. 173; motion not esti-
mated by speed and velocity alone, ii. 199-
201; motion absolute and relative illus-
trated, ii. 218.

Motion and pressure, ii. 207.
Morrison's weather almanac, i. 165.
Mosaic account of the Deluge, ii. 77.
Mountain Tycho, appearance of, i. 319.
Mountains of the moon, i. 318.
Multiplier, or galvanometer, ii. 124.
Mutual attraction or repulsion of electrized
clouds, i. 533.
Murray's slides, ii. 476.

N.

Napoleon's invitation to Volta to visit Paris,
i. 367; his liberality, i. 368.

Neap tides, i. 215.

Nebulæ and clusters of stars, ii. 383; neb-
ulæ in the constellation of the Swan and
the Great Bear, ii. 384, 385; nebulæ re-
solvable into stars, ii. 387; nebulæ in
Orion, ii. 388; catalogue of nebulæ, ii.
392; planetary nebulæ, ii. 395.
Nebular hypothesis of Laplace, ii. 395.
Nebulosity, the, i. 519.

Negative state of the earth, ii. 156.
Needles and steel bars magnetized by means
of the electric currents, ii. 121.
Newcomen and Cawley's patent for an en-
gine, ii. 411.

Newcomen's conception of the atmospheric
engine, ii. 411.

Norman discovers the dip of the magnetic
needle, ii. 113.

New metals: potassium, sodium, barium,
strontium, calcium, &c., i. 395.
New planets, the, i. 205-208.
Newton's speculations on the subject of
comets, i. 179, 425; his researches on the

subject of the weights of bodies, i. 487;
his explanation of the prismatic spectrum,
i. 577; his three propositions, or the laws
of motion, ii. 203.

New York and Liverpool steamers, projected
line of, i. 279, 342.

Nitric acid formed by the electric spark, ii.
65; produced during a thunder-storm, ii.
65.

Non-conductors of heat, ii. 183.
Nucleus, the, i. 520.

0.

Object, image of an, in a plane reflector, i.
262.

Ocean steam-voyaging limited only by ex-
pense, i. 346.

Ocean voyages for steamers and sailing ves-
sels, i. 340.

Oersted's experiments in electro-magnetism

at Copenhagen, ii. 120.

Olbers discovers Pallas and Vesta, i. 206.
Orbit of Halley's comet, its magnitude, i.
187.

Orbit of the moon, i. 321.

Orbits and transits of Venus and Mercury,
i. 147.

Orbitual motion of comets, i. 513; of double
stars, ii. 365.

Ordinary state of the atmosphere, ii. 151.
Orion, ii. 336.

Otto Guericke's electrical machine, i. 105.

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Physical constitution of comets, i. 513-528; Radiation, reflection, and absorption of heat,

of Mars, i. 152.

Piazzi discovers Ceres, i. 206.
Pion, ii. 336.

Piston, application of the, to steam-engine
illustrated, ii. 486.

Pistons, ii. 484; metallic pistons, ii. 485.
Piston-rod and beam, connexion of, in dou-
ble-acting engine, ii. 453–457.

Plan of the working machinery of an engine,
ii. 547.

Planes of cleavage, ii. 27.
Planetary nebulæ, ii. 391.

Planets, are they inhabited? i. 52; their
analogy to the earth, i. 53.

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Planet Herschel, discovery of predicted by Rectangular lever, ii. 250.

Clairaut, i. 184.

Plug-frame, ii. 415.

Plurality of worlds, i. 51-64.

Pneumatic trough in the chemical laborato-
ries, i. 302.

Pointed and blunt lightning conductors, ii. 104.
Pointers, the, ii. 334.

Poisson's analytical works, i. 139.
Polarity of the magnet, illustrations of, ii. 113.
Pole-star, the, ii. 332.

Pontecoulant predicts a third appearance of
Halley's comet, i. 186.
Pools, disappearance of, i. 607.
Popular fallacies, ii. 85-96.
Popular impressions respecting the effects
of thunder, ii. 78.

Porosity, ii. 28; all bodies have pores, ii. 29.
Positive and negative electricity, i. 115.
Potash and soda, decomposition of, i. 385.
Powder-magazines, lightning conductors for,
ii. 106.

Power of a locomotive, ii. 554.

Priming and lugging of the tides, i. 216.
Princeton steamer, i. 280.

Principle of heat, most ordinary sources of,
ii. 183, 184.

Principle of the steam-engine, ii. 314.
Prism, the, i. 577.

Prismatic spectrum, the, i. 438, 577.
Procyon, ii. 338.

Prognostications of the weather by the
ancients, i. 406.

Proper motions of the stars, ii. 370.
Proportion of the diameter to the stroke of
the cylinder of steam-engine, ii. 521.
Prospects of steam-navigation, i. 269–282.
Protection from lightning, ii. 99–108.
Pulley, the, ii. 271–280.

Pulsations of the eye, i. 230.

Q.

Quadrupeds, motion of, ii. 236.

Red moon, the, i. 502.

Reflection, irregular, i. 260; at plane sur-
faces, i. 260; its laws, i. 261; at curved
surface, i. 263.

Reflection of light, i. 259-266; of liquids, i.
265.

Reflectors, concave and convex, i. 263.
Refraction at plane surfaces, i. 576.
Refraction of a ray of light, i. 575.
Regulus, ii. 338.

Relation of heat and light, ii. 187–194.
Relative brightness of the stars, ii. 346.
Resinous electricity discovered by Dufaye,
i. 108.

Resistance produced by friction, ii. 262; ex-
periments on resistance, ii. 263.

Rest and motion, i. 361.

Reviews of the opinions of the English press
on the Atlantic steam-navigation question,
i. 348.

Revolving shafts in spinning machinery, ii.
259.

Richmann, death of, i. 126.
Rigel, ii. 336.

Ritter's secondary pile, i. 376.

Roads regarded as inclined planes, ii. 284.
Rolling thunder caused by echo, i. 554.
Rotatory motion of the planets, i. 56.

S.

Sabine's observations of luminous clouds, 1
547.

Safety-valve, the, ii. 511.
Salts, crystallization of, ii. 26.
Sand fused by artificial heat, ii. 69.
Satellites of Saturn, i. 251.

Saturn, his diurnal rotation, i. 245; his at
mosphere and rings, i. 246; when his
rings will be visible at the earth, i. 249;
his satellites, i. 251; variety of his months,
i. 251.

Saussure's electroscope, ii. 150.

Quicksilver passing through the pores of Savery's engine, ii. 405.

wood, ii. 28.

Sawmill at Southampton, England, ii. 259.

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Water-wheels, ii. 255.
Watch, general view of, ii. 267.
Watch-spring, ii. 257.

Watson and Bevis's experiments in elec-
tricity, i. 111.

Watt's inventions and improvements in the
steam-engine, ii. 423-440; his air-pump,
ii. 423; his experimental apparatus, ii.
425; his first patent for a steam-engine,
ii. 428; his steam-indicator, ii. 508; his
counter for the steam-engine, ii. 510.
Weather almanacs, i. 159-168.
Waves of light, minuteness of, i. 229.
Wedge, the, ii. 287.

Wedge, screw, and inclined plane, ii. 283–

294.

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Whirlwinds and water-spouts, i. 599–608.
Whiston's comet, and his theory, i. 428.
White's pulley, ii. 276.

Williams's patent for a method of consuming
unburnt gases, ii. 499.

Wilson discovers the lateral shock, i. 112.
Wind, action of on sails of vessels, ii. 213.
Wind and water-mills, Smeaton's improve-
ments of, ii. 443.
Windlass, the, ii. 254.
Wings of insects, ii. 24.
Wollaston's cryophorus, ii. 174.
Wollaston's micrometric wire, ii. 23, 24;
his investigations on the subject of the
comparative brightness and magnitude of
the stars, i. 593.

Woolf's piston, ii. 485.

Working-machinery of a locomotive engine,
plan of, ii. 547.

Worlds, plurality of, i. 51-64.

Y.

Young's discoveries in the philosophy of
light, i. 233.

Z.

Zigzag lightning, i. 538, 556.
Zodiacal constellations, ii. 338.

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