The Stone Age: its Duration and its Place in Time. The nineteenth century, now nearing its close, has made an indelible impression upon the history of the world, and never were greater things accomplished with more marvellous rapidity. Every branch of science, without exception, has shared in this progress, and to it the daily accumulating information respecting different parts of the globe bas greatly contributed. Regions, previously completely closed, have been, so to speak, simultaneously opened by the energy of explorers, who, like Livingstone, Stanley, and Nordenskiold, have won immortal renown. In Africa, the Soudan, and the equatorial regions, where the sources of the Nile lie hidden; in Asia, the interior of Arabia, and the Hindoo Koosh or Pamir mountains, have been visited and explored.
