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Phial, Leyden, where discovered, III. 262:
Philosophy, what it is, I. 12. Natural and experimen.

tal, the introduction to, not difficult, ib. Natural,

the uses to which it is applied, I. 82.
Philosophical Transactions, referred to, N. 312.
Pisa, tower of, leans out of the perpendicular, 1. 68.
Plane, inclined, explained, I. 139. Examples re

specting the, 1. 141-144. What instruments re-

ferable to, I. 144.
Planets, their number and names, I. 201. Characters

of, 1. 189. Latitude of, I. 195. The order of their
motions, I. 201. How to find their distances, t.

317, 318.
Pneumatics, what, treated of under, II. 199.
Points, cardinal, I. 171.
Pole-star, its use, I. 171.
Poles, apparently stationary, I. 230. At the only one

day and one night in the year, I. 253.
Press, hydrostatical II. 64, 65.
Priestly, Dr. his bistory of electricity referred to DI,

216.
Price, Dr. referred to, I. 55.
Prism, the effect of, III 136.
Puddling, what meant by the term, II. 80.
Pulley, how explained, 1. 133. The single gives no

advantage, ib. The moveable, I. 135.
Pump, principle of, 11. 179–186.
Pump.forcing described, II. 187.
Pyrometer, its construction and use, II. 384.

R

Radiant.points, from whence rays of light flow in all

directions.

Rainbow, the cause explained, III. 134. Artificial,

III. 141. Curious ones described, III. 141, &c.
Rain-gauge, its construction, II. 394. How it is used,

II. 395.
Rain, an electrical phenomenon, III, 320.
Ruys, pencil of, what meant by, III. 44. Parallel

definition of, ib.
Reflection, rebounding back. Its powers in appa-

rently multiplying objects, I. 166. Line of, ex.

plained, II. 297.
Refraction, inclining or bending out of its course. Its

power in apparently multiplying objects, I. 167.
Repulsion, driving away. What meant by, I. 36. In-

stances of, 1. 36, 37.
Residuum, electrical, what meant by, III. 269.
Retrogade motion, by which the heavenly bodies apa

pear to go backwards.
Reverberate, to beat back.
River, New, how it supplies London with water, IL.

88. Reservoirs belonging to, II. 89.
Rivers, banks of, must be very thick, II. 79.
Round. abouts, the principle of, I. 102.

S.

Saliva, decomposed by Galvanism, III. 351.
Sult, whatever has a sharp taste, and is soluble in

water.
Salt water, heavier than fresh, consequence of, to a

loaded vessel, II. 149.
Satellites, moons.
Saturn, the planet how known, I. 328. Its magni.

tude, distance from the sun ; velocity of its mo.

tions, I. 328, 329. Its satellites and rings, I. 330,

331. The length of its day and night, I. 331.
Screw, an inclined plane wrapt round a cylinder. Its

principle explained, I. 149. Of wbat composed, I.
150. Examples of, 1. 151. Used by paper-makers,

1. 155. Its power estimated, ib.
Season, the hottest, I. 248.
Seasons, variety of, on what depends, I. 238, and 244.

different, how accounted for, I. 232, and 238—254.

How produced, I. 248.
Ship, damaged by lightning, III. 312.
Silurus electricus, described, IU. 335.
Silver, experiment with, III. 349.
Slades, how they get at their master's rum, II. 140.
Smoke, the reason of its ascent. II. 265.
Smoke-Jack, its principle, II. 314.
Solar system, described, I. 197—205.
Solder, for what used, 1. 34.
Sound, conductors of, II. 275, 276. How far may

be heard, II. 281. How fast it travels, II. 283.
Velocity of, applied to practical purposes, II. 285

--287,
Spark, electrical, its nature, III. 287. Galvanic, its

power. NU. 369.
Specific gravity, what meant by, II. 36. Of bodies ex.
plained and illustrated, II. 92–137. How to find,

II 95.
Spectacles, their construction, uses, and different

kinds, III. 128-130.
Spirit, rectified, what meant by, II. 144, &c.
Springs, intermitting, explained, 11. 163.
St. Paul's, whispering gallery of, principle explained,

II. 306.
Stars, how to find the names of, 1. 173-177. Why

marked on the globe with Greek characters, I.
177. Fixed, their apparent motion, I. 229. Why
not seen in the day, I. 231. Fixed, their number,

1 - 163. May be distinguished, I. 169. Fixed,

their immense distance, I. 258. Fixed, description
of, L. 345–349. Their uses, I. 350. Falling, what

they are, III. 310.
Steam-engine, its use, II. 325. When invented, II.

327. Its structure, II. 330. The application, II.
341, 342. That of Messrs. Whitbread described,
II. 344. Its power calculated, ib. Accidents oc-

casioned by, II, 346.
Steelyard, a sort of lever, I. 112. Its advantages over

a pair of scales, I. 113.
Storms, by what occasioned, 1I. 321.
Suction, no such principle in nature, II. 224-230.
Sulphuret, alkaline, what, III. 365.
Summers, two in a year, in some places, I. 252.
Sun and clocks, seldom together, I. 193.
Sun, declination of, 1. 190. Longitude of, I. 195.

Has not latitude, I. 195. Its magnitude, 1. 198.
Why it appears so small, ib. Its distance from
the earth, I. 199. Annual motion of, how obsery-
ed, I. 233. Reasons for, I. 180. Nearer to the
earth, in winter, than in summer, I. 246. A de-

scription of, 1. 342-344.
Swimming, theory of, II. 149. How to be attained,

II. 150. Less natural to man than to other land

animals, II. 150.
Syphon, the structure of, explained, II. 156. Its prin.

ciple, II, 158.
Syringe, lits structure explained, II. 219. Condensing

one described, II. 260.

T.

Tables, Galvanic, III. 365, 366.
Tangent, a straight line touching the circumference

of a circle in one point.

Tangible, capable of being felt or handled.
Tantalus's cup, II. 160.
Taste, a disagreeable one, excited by the union of

met als placed on and under the tongue, III. 350.

How accounted for, III. 351.
Telescope, refracting, explained, III. 143. Night, M.

151. Reflecting, explained, III. 153. Dr. Her.

schel's, III. 157.
Terms, technical, derived from the Greek language,

II. 11.
Thermometer, its construction and uses, 11.369—375.

Its scale, Il. 375. Wedgewood's, U. 378. Reau-
mur's scale compared with Fahrenheit's, fl. 382.

Heat, scale of, II. 381.
Thunder, how produced, II. 278.
Tides, the causes of, explained, I. 289-296. Two

every 25 hours, I. 293. Different in different

places, I. 294. When the highest happen, I. 296,
Time, equal and apparent, how distinguished, 1.255,

256. On what the difference depends, I. 256.
Equation of, I. 193 and 255_-264. Division of,

I. 271.
Time and space, clear ideas of, necessary to be form-

ed, I. 103.
Torpedo, described, III. 330.
Torricellian experiment, II. 161.
Transferrer, an instrument used in pneumatics.
Transit of Venus, her passages over the sun's face.
Trembling-eel, noticed, III. 335.
Triangle, what meant by, I. 17. Any two sides of,

greater than the third, 1. 94.
Tropics, circles parallel to the equator.
Trumpet, speaking, described, II. 288-293. When

first used, II. 291.
Trumpets, for deaf persons, II. 292.
Tube, a pipe.
Twilight, the degree of light experienced between

sun setting or rising and dark night.

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