Shells, upraised state of, in Patagonia. —elevated, too small for human food. —transported far inland, for food. —upraised, proportional numbers varying. — —gradual decay of. — —absent on high plains of Chile. — —near Bahia Blanca. —preserved in concretions. —living and fossil range of, on west coast. —living, different on the east and west coast.
Shingle of Patagonia.
Siau, M., on sea-bottom.
Silver mines of Arqueros. —of Chanuncillo. —of Iquique. —distribution of.
Slip, great, at S. Cruz.
Smith, Mr., of Jordan Hill, on upraised shells retaining their colours. —on Madeira. —on elevated seaweed. —on inclined gravel beds.
Soda, nitrate of. —sulphate of, near Bahia Blanca. —carbonate of.
Soundings off Patagonia. —in Tierra del Fuego.
Spirifers.
Spix and Martius on Brazil. Sprengel on the production of carbonate of soda.