Prehistoric Remains.-One often finds buried in the earth, weapons, implements, human skeletons, débris of every kind left by men of whom we have no direct knowledge. These are dug up by the thousand in all the provinces of France, in Switzerland, in England, in all Europe; they are found even in Asia and Africa. It is probable that they exist in all parts of the world. These remains are called prehistoric because they are more ancient than written history. For about fifty years men have been engaged in recovering and studying them. Today most museums have a hall, or at least, some cases filled with these relics. A museum at Saint-German-en-Laye, near Paris, is entirely given up to prehistoric remains. In Denmark is a collection of more than 30,000 objects. Every day adds to the discoveries as excavations are made, houses built, and cuts made for railroads.