INDEX

A.

Achromatism, Hall, Dollond , 384.

Adelhard, translation of Euclid ,105.

Alexandria, school of, 33. Secondschool, 69.

Algebra in successive ages, 14.104.112. 121, 122. 190. 195. 212. 220.222 .

Alhazen , optics, 97.

Alphonso X . cultivates astronomy,115.

Analysis largely cultivated on theContinent • from the first, 367.Recent progress in England, 368.

Anaxagoras , gravity, reflected lightof the moon, 21. Atoms, 24.

Anaximander , 18. 24.

Anaximenes , 18. 24.

Ancient science, decline of, 79.Remarks on its progress and cha-racter, 80. Philosophical systems,85. Mistakes as to object of Na-tural Philosophy , 90.

ApolloniusPergaus, conic sections,47. Asymptotes, 49. Osculatingcircle j evolute, 50. Maxima andminima j geometric loci ; analy-sis, 51.

Arabians, science among the, 94.Astronomy; trigonometry, 95.

Archimedes , 40. Geometry; arcof parabola, 41. Sphere, cone,and cylinder; area of circle, 42.Spiral; mechanics; property oflever, 43. Centre of gravity;burning mirrors, 44. Hydrosta-tics ; specific gravity, 45. Float-ing bodies; union of mathematicswith physics, 46.

Archytas , invented the pulley andscrew, 26.

Aristarchus, solar system; paral-lax of fixed stars; distances ofsun and moon, 53.

Aristotle, gravity and levity; Na-ture’s horror of a vacuum, 25.

Composition of forces ; naturaland violent motion, 26. Optics,28.

Astrology in the middle ages, 114.Astronomy in successive ages, 710, 11. 13. 15.17,48. 23. 52, 54. 64.69. 95.115, 116. 133.138.145. 154.166. 227. 238. 355. 379.Astronomy, physical: modern pro-gress of, 371.

Astronomy, plane: modern pro-gress of, 379.

Aulus Gellius , optical illusions, 67.

B. «

Bacon, Francis , Lord Verulam, 196.Novum Organon , 197. Value ofhis system of philosophising, 906.

Bacon, Roger , 109. Progress inscience; optical discoveries, 110.Freedom of enquiry, 111. Per-secution, 112.

Baptista Porta; camera obscura ;magia naturalis, 127.

Barrow, infinitesimals, 221. Optics.246.

Bartholinus, double refraction,248.

Benedetto, 120.

Berkely, Bp., attack on the flux-ional method, 366.

* Bouillaud, elliptic orbits, 238.

Boyle, 254.

Bradley, Dr., discoveries of aber.ration and nutation, 380.

Briggs, logarithms; binomial co-efficients, 195.

Burning glasses known to the an-cients, 66.

C.

Calendar,' regulation of; Cycleof Cleostratus; of Meton ; ofCalippus, 22. Reformation, byJulius Caesar, 64. By GregoryXIII. , 142.