First of all, every year each young man and woman should take a fresh look about the world house in which all live. When Ivanhoe waked to find himself a prisoner in a strange castle he straightway explored the mansion, passing from chamber to banquet hall, and from tower to moat, and the high walls that shut him in. If, indeed, God did so dearly love this star as to use its very dust for making man in His own image, we ought to love and study well this world house, wherein is enacted the drama of man's life and death. Longfellow thought of our earth as a granite-sheathed ship sailing through air, with plate of mail bolted and clamped by the Almighty mechanism, the throbbings of Vesuvius hinting at the deep furnaces that help to drive her forward upon the voyage through space. But God's name for this earth house was Paradise. And a veritable paradise it is, with its vegetable carpet, soft and embroidered, beneath man's feet; with its valleys covered with corn until they laugh and sing; with its noble architecture of the mountains covered with mighty carvings and painted legends. Verily, it would be an ungracious thing for us to go on living here without taking the trouble to look upon this earth's floor, so firm and solid, or study the beauteous ceiling lighted with star lamps by night. And the evenings of one week with Geikie or Dana will tell us by what furnaces of fire the granite was melted, by what teeth of glaciers and weight of sea-waves the earth's surface was smoothed for the plow and the trowel. How long it has been since the glacier was a mile thick upon the very spot where we stand, how long since the waters of Lake Michigan, now flowing over Niagara, ceased flowing into the Mississippi. The evenings of another week with Professor Gray or Grant Allen will tell us how all the trees and plants live and breathe and wax great; how the lily sucks whiteness out of the slough, and how the red rose untwists the sunbeam and pulls out the scarlet threads. The evenings of another week with Ball or Proctor or Langley will exhibit the sun pulling the harvests out of our planet, even as the blazing log pulls the juices out of the apples roasting before the hot coals; how large a house on the moon must be in order to be seen by the new telescope at Lake Geneva; whether or not the spots on the sun represent great chunks of unburned material, some of which are a full thousand miles across, materials thrown up by gaseous explosions. While Maury will take us during another week, in a glass boat that is water-tight, upon a long cruise more than three thousand leagues under the sea, showing us those graveyards called sea shells, those cities called coral reefs, those strange animals that have roots instead of feet, called sponges.