613 



INDEX. 



ABA 



4 BAUZIT, great patience of, 

 A 253 

 'Aberration of light,' discovery 



of, 236-238 

 Absorbing and radiating powers 



of gases for light, 578-579 

 Absorption of light ; its various 



effects, 32 

 Abstract terms, 82 

 Abstruse ideas, 48 

 Accademia del Cimento, 284-287 

 Accidental' circumstances, 445 

 Accuracy in science, 19, 148-149, 



253 

 Accurate apparatus, advantage of, 



314 



measurements, value of, 393 

 Achromatic lenses, invention of, 



477 

 Acoustic figures, discovery of, 



543 



Adams and Le Verrier's discove- 

 ries, 515, 543, 609, 610 

 ^JEpinus's discovery and invention, 



534-535 



' Aerial acid,' 540 

 Agassiz's discoveries of glacier 



phenomena, 571 

 Age, its influence upon the power 



of research, 275-278 

 Air, elasticity of, 526 

 Airy's discoveries, 574 

 Air-pump, invention of the, 474 

 Alcohol, discovery of anhydrous, 



551 



ANC 



Aldini's discovery of electro-mus- 

 cular contraction, 554 



Alizarine, discovery of artificial, 

 600 



Alkalies, discovery of the dif- 

 ference between ' mild ' and 

 ' caustic,' 540 



Alkali-metals, discovery of, 11, 

 230, 483-484, 546, 561 



Alum crystal, its self-repairing 

 power, 34 



Amalgam of tin, its use with an 

 electrical machine, 534 



Ambiguous terms, danger of em- 

 ploying, 76 



Ammonia, decomposition of by 

 electrolysis, 554-555 



* Amorphous antimony,' 238-239, 

 550, 567 



Ampere's religious opinions, 261 



discoveries, 170-171, 536-537, 

 547, 593, 610 



invention of a galvanometer, 485 



suggestion of an electro-mag- 

 netic telegraph, 537 



theory respecting gaseous mole- 

 cules, 599-600 



Analogy and generalisation, 402 



as an aid to discovery, 327 

 Analysis of evidence, 333 



and synthesis, discovery by, 

 217,460-461,524-525 



Anatomy, discoveries in, how 



made, 579 

 Ancestors of the human race, 604 



