Trachyte, varieties of, xiii, 249; xv, 32.
— at the Azores, iv, 259.
Tracks, see [Footprints.]
Tract Society of Paris, v, 383.
Tracy, C., on the rotary action of storms, xiv, 65.f
—, on the oil of Indian corn, xliii, 403.
Trade, statistics of, between Great Britain and the United States, xxxiii, 277.
— winds, remarks on, W. C. Redfield, xxv, 124; xxxiii, 61.
Traill, T. S., Russian vapor bath, xxiii, 295.
—, on the preservation of animals, xv, 167.