Aristarchus of Samos, the pioneer of the Copernican system, 65.
Aristotle, 65; his definition of Cosmos, 69; use of the term history, 75; on comets, 103, 104; on the Ligyan field of stones, 115; aerolites, 122; on the stone of Aegos Potamos, 135; aware that noises sometimes existed without earthquakes, 209; his account of the upheavals of islands of eruption, 241; "spontaneous motion," 341; noticed the redness assumed by long fallen snow, 344.
Artesian wells, temperature of, 174, 223.
Astronomy, results of, 38-40; phenomena of physical astronomy, 43, 44.
Atmosphere, the general description of, 311, 316; its composition and admixture, 312; variation of pressure, 313-317; climatic distribution of heat, 313, 317-328; distribution of humidity, 313, 328, 334; electric condition, 314, 335-338.
p 363 August, his psychometer, 332.
Augustine, St., his views on spontaneous generation, 345, 346.
Aurora Borealis, general description of 193-202; origin and course, 195, 196; altitude, 199; brilliancy coincident with the fall of shooting stars, 126, 127; whether attended with crackling sound, 199, 200; intensity of the light, 201.
Bacon, Lord, 53, 58; Novum Organon, 290.
Baer, Von, 337.