Magnesia, sulphate of, in veins.
Malcolmson, Dr., on trees carried out to sea.
Maldonado, elevation of. —Pampean formation of. —crystalline rocks of.
Mammalia, fossil, of Bahia Blanca. — —near St. Fe. — —of Banda Oriental. — —of St. Julian. — —at Port Gallegos. —washed down by floods. —number of remains of, and range of, in Pampas.
Man, skeletons of (Brazil). —remains of, near Lima. —Indian, antiquity of.
Marble, beds of.
Maricongo, ravine of.
Marsden, on elevation of Sumatra.
Mastodon Andium, remains of. —range of.
Maypu, Rio, mouth of, with upraised shells. —gravel fringes of. —debouchement from the Cordillera.