772 



INDEX. 



Arago, photometer, 288 ; rotating 

 disc, 535 ; his philosophic cha- 

 racter, 592. 



Archimedes, De Arena Numero, 

 195 ; centre of gravity, 363. 



Arcual unit, 306, 330. 



Argyll, Duke of, 741. 



Aristarchus on sun's and moon's 

 distances, 294. 



Aristotelian doctrines, 666. 



Aristotle, dictum, 21 ; singular 

 terms, 39 : overlooked simple 

 identities, 40 ; order of premises, 

 114; logical error, 117; defini- 

 tion of time, 307 ; on science, 

 595 ; on white swans, 666. 



Arithmetic, reasoning in, 167 ; of 

 approximate quantities, 481. 



Arithmetical triangle, 93, 143, 

 182, 202, 378, 333 ; diagram of, 

 184 ; connection with Logical 

 Alphabet, 189 ; in probability, 

 208. 



Asteroids, discovery of, 412, 748. 



Astronomy, physical, 459. 



Atmospheric tides, 553. 



Atomic theory, 662. 



Atomic weights, 563. 



Atoms, size of, 195 ; impossibility 

 of observing, 406. 



Augustin on time, 307. 



Average, 359, 360 ; divergence 

 from, 188 ; etymology of, 363. 



Axes of crystals, 686. 



Axioms of algebra, 164. 



BABBAGE, Charles, calculating 

 machine, 107, 231, 743; light- 

 house signals, 194 ; natural con- 

 stants, 329 ; Mosaic history, 412 ; 

 -universal and general truths, 646 ; 

 change of law, 230 ; persistence 

 of effects, 757. 



Bacon, Francis Lord, Nmrum Orga- 

 num, 107; on induction, 121; 

 biliteral cipher, 193; First 

 Aphorism, 219 ; on causes, 221 ; 

 Copernican system, 249, 638 ; 

 deficient powers of senses, 278 ; 

 observation, 402; Natural His- 

 tory, 403 ; use of hypothesis, 

 506 ; his method, 507 ; experi- 

 mentum crucis, 519 ; error of 

 his method, 576 ; ostensive, 

 clandestine instances, &c., 608, 

 610; latins precessitu, 619. 



Bacon, Roger, on the rainbow, 526, 

 598. 



Baily, Francis, 272 ; density of 

 earth, 342, 566 ; experiments 

 with torsion balance, 370, 397, 

 432, 567-8 ; motions of stars," 

 572. 



Bain, Alexander, on powers of 

 mind, 4 ; Mill's reform of logic, 

 227. 



Baker's poem, The Universe, 621. 



Balance, use of the chemical, 292, 

 351, 354, 369 ; delicacy of, 304 ; 

 vibrations of, 369. 



Ballot, Buys, experiment on sound, 

 541. 



Ballot-box, simile of, 150, 251-6, 

 765. 



Barbara, 55, 57, 88, 105, 141. 



Baroko, 85. 



Barometer, 659 ; Gay Lussac's 

 standard, 346 ; variations, 337, 

 346, 349. 



Bartholinus on double refraction, 

 585. 



Base-line, measure] neut of, 304. 



Bauhusius, verses of, 175. 



Baxendell, Joseph, 552. 



Beneke, on substitution, 21. 



Bennet, momentum of light, 435. 



Bentham, George, 15 ; bifurcate 

 classification, 695 ; iufinia species, 

 702 ; works on classification, 

 703 ; analytical key to flora, 712. 



Bentham, Jeremy, on analogy, 629 ; 

 bifurcate classification, 703. 



Benzenberg's experiment, 388. 



Bernoulli, Daniel, planetary orbits, 

 250 ; resisting media and pro- 

 jectiles, 467 ; vibrations, 476. 



Bernoulli, James, 154; numbers of, 

 124; Protean verses, 175; De 

 Artc Conjectandi quoted, 176; 

 183 ; on figurate numbers, 183 ; 

 theorem of, 209 ; false solution 

 in probability, 213 ; solution of 

 inverse problem, 261. 



Bessel, F. W., 375 ; law of error, 

 384 ; formula for periodic varia- 

 tions, 488 ; use of hypothesis, 

 506 ; solar parallax, 560-2 ; ellip- 

 ticity of earth, 565 ; pendulum 

 experiments, 604. 



Bias, 393, 402. 



Biela's comet, 746. 



Bifurcate classification, 694. 



