Schomburghk, Sir R., on sea-bottom. —on the rocks of Guyana.
Scotland, sloping terraces of.
Sea, nature of bottom of, off Patagonia. —power of, in forming valleys.
Sea cliffs, formation of.
Seale, Mr., model of St. Helena.
Sebastian Bay, tertiary formation of.
Sedgwick, Professor, on cleavage.
Serpentine of Copiapo.
Serpulae, on upraised rocks.
Shale-rock, of the Portillo Pass. —of Copiapo.