INDEX. 



Aberration, Chromatic, 104. 



,, of sphericity, 105. 



Absorption of light, 95. 

 Acid, Acetic, 411. 

 Citric, 414. 

 Formic, 415. 

 Lactic, 415. 

 Malic, 414. 

 Oxalic, 414. 

 Tannic, 414. 

 Tartaric, 414. 

 Acoustics, Instruments for, 180. 

 ,, The science of, 166. 

 Actinozoa, The, 710. 

 Action and reaction, 35. 

 ,, Catalytic, 328. 



Electro-chemical, 220. 

 Adhesion of fluids, 25. 

 Aerolites, Meteorites or, 493. 

 Age, The great ice, 595. 

 Agricultural, Science in, 7. 

 Air, Composition of, 340. 

 Composition of the, 45. 

 As motive power, 57. 

 Experiments with, 45. 

 Movement by heat, 82. 

 Pressure of, in bodies, 292. 

 ,, on mountains, 55. 



the, 45. 



Science in open, 6. 

 Weight of the, 50. 

 pump, Experiments, 45. 

 ,, Description, 51. 

 ,, Sprengel's, 51. 

 Alarum lamp, A new, 760. 

 , Albumen, 422. 

 Alchemists, Celebrated, 336. 

 Alchemy, 336. 



Alcoholic thermometers, 80. 

 Alcohol, 419. 

 Alembic, The, 357. 

 Algae, Mosses and, 688. 

 Alkali, Definition of an, 310. 

 Alphabets, Telegraphic, 238, 241. 

 Alps, Electric clouds in the, 291. 

 Alum, 440. 

 Aluminum, 393, 439. 

 Amber, 421. 

 Amebas, The, 705. 

 Ammonia, Uses of, 361. 

 Ammonite, 18. 

 Ammonium, 393, 437. 



,, never found, 365* 



Amorphous crystals, 431. 

 Anaesthetic, A new, 13. 

 Analysis of chance, 726. 

 Spectrum, 145. 

 Anamorphoses, 135. 

 Anatomy of the eye, 102. 

 Anemones, Sea, 710. 



Angles, how to measure, 474. 

 Animal electricity, 283. 

 Animals, Classifications of, 701. 



,, Vertebrate, etc., 700. 

 Annelida?, The, 714. 

 Annulosa, The, 714. 

 Anthelion, An, 300. 

 Antimony, Uses of, 404, 446. 

 Apparatus for Botanists, 17. 

 , , Geologists, 17. 



,, Mineralogists, 17. 



Appliances, Astronomical, 557. 

 Aqua regia, 325. 

 Aquarium, A home-made, 9. 

 Aquarius constellation, 540. 

 Aquatic experiments, 9. ' 

 Arachnida, The, 723. 

 Arc, Voltaic, 223. 

 Archimedes, Principle of, 68. 



Story of, 68. 



Areometer, Use of the, 27. 

 Aries, Constellation, 536. 

 Arsenic, 386, 446. 

 Artesian wells, 604. 

 Ascents, Celebrated balloon, 301. 

 Ascent, Gay-Lussac's, 298. 

 Astatic galvanometer, The, 227. 

 Asteroids, The, 527. 

 Astroea, Discovery of, 528. 

 Astronomers, Celebrated, 468. 

 Astrology, Early practice of, 467. 

 Astronomy, Definition of, 466. 

 ,, History of, 466. 



,, Terms used in, 471. 



Atmosphere, Composition of, 340. 



,, the same, 628. 



Atmospheric boat, The, 452. 

 electricity, 283. 

 Atom, Definition of an, 309. 

 Atomic or combining weight, 309. 



,, theory, The, 309. 

 Attraction, Capillary, 25, 64. 

 ,, Chemical, 25. 

 Molecular, 65. 

 ,, of cohesion, 24. 

 Audiphone, The, 185. 



Uses of the, 185. 

 Augites, 439. 



Aurora borealis, Cause of, 646. 

 Autophone, Principle of, 184. 

 ,, Use of the, 183. 

 Axis, Floral, 679. 

 Azimuth compass, The, 260. 

 Azote, 359. 



Balance, Chemists', 26. 



,, Hydrostatic, 26. 



, , Laws of, 25. 

 Balard, Experiments of, 27. 

 Ballooning, Sensational, 302, 



Balloons, Accidents to, 297. 

 ,, Early ascents in, 296. 

 ,, Endeavours to steer, 306. 

 Filling, 305. 

 Principle of, 305. 

 Band, A phantom, 196. 

 Barium, 393. 

 Barometer, Aneroid, The, 53. 



,, Glycerine, The, 54. 



,, Pascal's, 52. 



,, Weather forecasts, 652. 

 Barometers, Various, 53. 

 Barytes, 393, 438. 

 Bases, Definitions of, 310, 415. 

 Batteries, Different galvanic, 222. 

 Battery, electric, Description, 208. 

 Beaches, Mirage on, 18. 

 Bear, The Great, 542. 

 Bell, diving, The, described, 56. 

 Bernard Palissy, Saying of, z. 

 Bessemer process, The, 399. 

 Bicyclist, A toy, 765. 

 Binocular vision, 141. 

 Biology, Meaning of, 658. 

 Bird, M. Tatin's artificial, 451. 

 Birds, Mechanical, 449 

 Blue John, 395. 



Lias, The, 586. 

 Boat, Atmospheric, 452. 

 Bores, or tidal waves, 613. 

 Boron, 386. 



,, Mineral nature of, 435. 

 " Boss " puzzle, The, 731. 

 Botanists, Apparatus for, 17. 

 Botany, Introduction to, 657. 

 Boxes, Scientific money, 745. 

 Breezes, Sea and land, 630. 

 British Isles, Date of the, 593. 

 Bromine, where found, 367. 

 Bronze Age, The, 598. 

 Bulb, What is a, 667. 

 ,, Wollaston's, 91. 

 Bullets formed by electricity, 264. 

 Bunter formation, The, 585. 

 Buoyancy of water, The, 67. 

 Burglar-detector, A new, 195. 

 Butterflies, Capture of, 16. 



Cabinets, Optical, 98. 

 Cadot's clock, 752. 

 Caesum, 393. 

 Calamine, 403. 

 Calcium, 393, 437. 

 Calculation, Machine for, 755. 

 Caloric, Theory of, 72. 

 Calyx, The, 675. 

 Cambrian system, 575. 

 Camera obscura, The, 140. 



,, photographic, The, 151. 

 Camphor, 421. 



