Polarization, chromatic, results of its discovery, 52; experiments on the
light of comets, 105, 106.
Polybius, 291.
Posidonius on the Ligyran field of stones, 115, 116.
Pouilet on the actual source of atmospheric electricity, 335.
Prejudices against science, how originated, 38; against the study of the
exact sciences, why fallacious, 40-52.
Prichard, his physical history of Mankind, 352.
Pseudo-Plato, 54.
Psychrometer, 332, 338.
Pythagoras, first employed the word Cosmos in its modern sense, 69.
Pythagoreans, their study of the heavenly bodies, 65; doctrine on comets,
103.
Quarterly Review, article on Terrestrial Magnetism, 192.
Quetelet on aerolites, 114; their periodic return in August, 125.
Races, human, their geographical distribution, and unity, 351, 359.
Rain drops, temperature of, 220; mean annual quantity in the two
hemispheres, 333, 334.
Reich, mean density of the earth, as ascertained by the torsion balance,
170; temperature of the mines in Saxony, 174.
Reisch, Gregory, his "Margarita Philosophica," 58.
Remusat, Abel, Mongolian tradition on the fall of an aerolite, 116; active
volcanoes in Central Asia, at great distances from the sea, 245.
Richardson, magnetic phenomena attending the Aurora, 197; whether
accompanied by sound 200; influence on the magnetic needle of the Aurora,
201.
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