—, quantity of, in sea-water, C. Daubeny, xxxvi, 188.
—, marine, arsenic detected in, xx, 193.
— infusoria, xli, 193.
— beds, origin of, L. Vanuxem, xii, 88.
— manufactured by evaporation on faggots, x, 180.
— in Asia, Tabriz, Lake Oroomiah, and of the great desert of Arabia, xxxvii, 350.
— in Europe, annual yield of mines, iii, 371.
— —, in Russia, xvii, 19, 20.
— —, —, steppe south of Orenburg, R. I. Murchison, xliv, 205.
— —, mines of Ischil, xxix, 225.