INDEX. 



777 



dulum, 342, 431, 522 ; on velocity 

 of light, 441, 521, 561. 

 Fourier, Joseph, theory of dimen- 

 sions, 325 ; theory of heat, 469, 



Fowler, Thomas, on method of 

 difference, 439 ; reasoning from 

 case to case, 227. 



Frankland, Professor Edward, on 

 spectrum of gases, 606. 



Franklin's experiments on heat, 

 424. 



Fraunhofer, dark lines of spectrum, 

 429. 



Freezing-point, 546. 



Freezing mixtures, 546. 



Fresnel, inflexion of light, 420 ; 

 corpuscular theory, 521 ; on use 

 of hypothesis, 538; double re- 

 fraction, 539. 



Friction, 417 ; determination of, 

 347. 



Function, definitions of, 489. 



Functions, discovery of, 496. 



GALILEO, 626 ; on cycloid, 232, 

 235 ; differential method of obser- 

 vation, 344 ; projectiles, 447, 

 466 ; use of telescope, 522 ; 

 gravity, 604 ; principle of con- 

 tinuity, 617. 



Gallon, definition of, 318. 



Galton, Francis, divergence from 

 mean, 188 ; works by, 188, 655 ; 

 on hereditary genius, 385, 655. 



Galvanometer, 351. 



Ganieres, de, 182. 



Gases, 613 ; properties of, 601, 602 ; 

 perfect, 470 ; liquefiable, 665. 



Gauss, pendulum experiments, 31 6 ; 

 law of error, 375-6 ; detection of 

 error, 396 ; on gravity, 463. 



Gay Lussac, on boiling point, 659 ; 

 law of, 669. 



Genealogical classification, 680, 719. 



General, terms, 29 ; truths, 647 ; 

 notions, 673. 



Generalisation, 2, 594, 704 ; mathe- 

 matical, 168 ; two meanings of, 

 597 ; value of, 599 ; hasty, 623. 



Genius, nature of, 575. 



Genus, 433, 698 ; generalissimum, 

 701 ; natural, 724. 



Geology, 667 ; records in, 408 ; 

 slowness of changes, 438 ; excep- 

 tions in, 660. 



Geometric mean, 361. 



Geometric reasoning, 458 ; certainty 

 of, 267. 



Giffard's injector, 536 



Gilbert, on rotation of earth, 249 ; 

 magnetism of silver, 431 ; expe- 

 rimentation, 443. 



Gladstone, J. H., 445. 



Glaisher, J. "W. L., on mathematical 

 tables, 331 ; law of error, 375,395. 



Gold, discovery of, 413. 



Gold-assay process, 434. 



Gold-leaf, thickness of, 296. 



Graham, Professor Thomas, on 

 chemical affinity, 614; conti- 

 nuity, 616, nature of hydrogen, 

 691. 



Grammar, 39 ; rules of, 31. 



Grammatical, change, 119 ; equi- 

 valence, 120. 



Gramme, 317. 



Graphical method, 492. 



Gravesande, on inflection of light, 

 420. 



Gravity, 422, 512, 514, 604, 740 ; 

 determination of, 302 ; elimi- 

 nation of, 427 ; law of, 458, 462, 

 474 ; inconceivability of, 510 ; 

 Newton's theory, 555 ; variation 

 of, 565 ; discovery of law, 581 ; 

 Faraday on, 589 ; discontinuity 

 in, 620 ; Aristotle on, 649 ; 

 Hooke's experiment, 436. 



Grimaldi on the spectrum, 584. 



Grove, Mr. Justice, on ether, 514 ; 

 electricity, 615. 



Guericke, Otto von, 432. 



HABIT, formation of, 618. 

 Halley, trade-winds, 534. 

 Halley's comet, 537, 570. 

 Hamilton, Sir William, disjunctive 



propositions, 69 ; inference, 118 ; 



free-will, 223. 

 Hamilton, Sir W. Rowan, on conical 



refraction, 540 ; quaternions, 634. 

 Harley, Rev. Robert, on Boole's 



logic, 23, 155. 



Harris, standards of length, 312. 

 Hartley, on logic, 7. 

 Hatchett, on alloys, 191. 

 Haughton, Professor, on tides, 



450 ; muscular exertion, 490. 

 Haiiy, on crystallography, 529. 

 Hayward, R. B., 142. 

 Heat, unit of, 324; measurement 



