Rossell, M. de, his magnetic oscillation experiments, and their date of
publication, 186, 187.
Rothmann, confounded the setting zodiscal light with the cessation of
twilight, 143.
Rozier, observation of a steady luminous appearance in the clouds, 202.
Rumker, Encke's comet, 106.
Ruppell denies the existence of active volcanoes in Kordofan, 245.
Sabine, Edward, observations on days of unusual magnetic disturbances, 178;
recent magnetic observations, 184, 185, 187, 188.
Sagra, Ramon de la, observations on the mean annual quantity of rain in the
Havana, 333.
Saint Pierre, Bernardin de, Paul and Virginia, 26; Studies of Nature, 347.
Salses or mud volcanoes, 224-228; striking phenomena attending their origin,
224, 225.
Salt works, depth of 158, 159; temperature, 174.
Santorino, the most important of the islands of eruption, 241, 242;
description of. See note by Translator, 241.
Sargasso Sea, its situation, 308.
Satellites revolving round the primary planets, their diameter, distance,
rotation, etc., 94, 99; Saturn's 96-98, 127' Earth's see Moon, Jupiter's,
96, 97; Uranus, 96-98.
Saurians, flying, fossil remains of, 274, 275.
Saussure, measurements of the marginal ledge of the crater of Mount
Vesuvius, 232; traces of ammoniacal vapors in the atmosphere, 311;
hygrometric measurements with Humboldt, 334-336.
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