But these flint tools are very old.

If you crack a fresh flint, you will see that its surface is gray, and somewhat rough, so that it sticks to your tongue.

These tools are smooth and shiny: and the edges of some of them are a little rubbed from being washed about in gravel; while the iron in the gravel has stained them reddish, which it would take hundreds and perhaps thousands of years to do.

There are little rough markings, too, upon some of them, which, if you look at through a magnifying glass, are iron, crystallised into the shape of little sea- weeds and trees--another sign that they are very very old.

And what is more, near the place where these flint flakes come from there are no flints in the ground for hundreds of miles; so that men must have brought them there ages and ages since.