Salses, compared with tuff craters.
Salt deposited by the sea. -in volcanic strata. -lakes of, in craters.
Sandstone of Brazil. -of the Cape of Good Hope. -platforms of, in New South Wales.
Schorl, radiating.
Scrope, Mr. P., on laminated trachyte. -on obsidian. -on separation of trachyte and basalt. -on silex in trachyte. -on sphaerulites.
Seale, Mr., geognosy of St. Helena. -on dikes. -on embedded birds’ bones.
Seale, on extinct shells of St. Helena.
Sedgwick, Professor, on concretions.
Septaria, in concretions in tuff.
Serpulae on upraised rocks.