Laws, 168;
his application of the Laws of Gravity to Astronomy, 177, 178, 179, 185,
190;
his reticence, 178;
his discoveries in Optics, 181, _seq._;
his work summarised, 186;
his _Optics_, 189;
anecdotes of him, 191;
his appearance in a Court of Justice, 195;
some of his manuscripts very recently discovered, 217;
his theories of the Equinoxes and tides, 223, _seq._, 225, 363, _seq._

O

Olbers, 299, 300

P

Peters, Prof., 300, 316

Piazzi, 298, 299, 308, 313

Picard, 190, 242, 244, 247

Pioneers, genuine, 7

Planets and days of the week, 18

Poynting, 332

Printing, 9

Ptolemy, 18, 20, 27, 38, 153, 155, 166, 214;
his system of the Heavens simplified by Copernicus, 11, 30;
his system described, 19, _seq._;
his system taught, 34;
his harmonies, 74

Pythagoras, 19, 20, 34

Q

Quadrant, an early, 42, 43

R

Rheiter, 107

Ricci, Ostillio, 86, 87

Roberts, Isaac, 268

Roemer, 239, 240, 242, 244, 249, 251, 308

Rosse, Lord, his telescope, 186, 268

Rudolphine tables, 65

S

Scheiner, 107

Sizzi, Francesca, an orthodox astronomer, 106

Snell, Willebrod, and the law of refraction, 65

Solar system, its fate, 265

Stars, a list of, 307

Struve, 308, 310, 311, 313

Stuart, Prof., quoted, 52

T

Tatius, 296

Telescopes, early, 96

Thales, 7, 140, 317

Thomson, Sir William, 367, 372, 373, 378, 394

Tide-gauge, described, 373, _seq._

Tides, 354, _seq._

Time, is not exactly uniform, 384

Torricelli, 133, 168

Tycho, see Brahe, Tycho

V

Vinci, Leonardo da, 9, 100, 144, 184

Viviani, 133, 168

Voltaire, 181

W

Watson, Prof., 300

Whewell, 227

Wren, Sir Christopher, 188, 192, 193, 197

Z

Zach, Von, 296, 299

Zone of Asteroids, 300, _seq._

THE END.

RICHARD CLAY AND SONS, LIMITED, LONDON AND BUNGAY.

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