The Volcano of Cotopaxi. — The form of Cotopaxi is the most beautiful and regular of the colossal summits of the Andes. It is a perfect cone, which, covered with an enormous layer of snow, shines with dazzling splendour at the setting of the sun, and detaches itself in the most picturesque manner from the azure vault of the sky. In scaling the volcano of Cotopaxi, it is extremely difficult to attain the inferior boundary of perpetual snow. On the southeast of the mountain is a mass of rock, half-concealed under the snow, studded with points, and which the natives call “the head of the Inca.”—Humboldt’s Researches.