Thermal springs, their temperature, constancy, and change, 221-224; animal and vegetable life in, 345.
Thermometer, 338.
Thibet, habitability of its elevated plateaux, 331, 332.
Thienemann on the Aurora, 197, 200.
Thought, results of its free action, 53, 54; union with language, 56.
Tiberias, Sea of, its depression below the level of the Mediterranean, 296.
Tides of the ocean, their phenomena, 305, 306.
Tillard, Capt., on the sudden appearance of the island of Sabrina, 242.
Tournefort, zones of vegetation on Mount Ararat, 347.
Tralles, his notice of the negative electricity of the air near high waterfalls, 336.