But this higher finish we may attribute partly to the superiority of the material; for the Mexicans also used flint to some extent, and their flint weapons are as hard to distinguish by inspection as those from other parts of the world.

We may reasonably suppose, moreover, that the skill of the Mexican artificer increased when he found a better material than flint to work upon.

Be this as it may, an inspection of any good collection of such articles shows the much higher finish of the obsidian implements than of those of flint, agate, and rock-crystal.

They say there is an ingenious artist who makes flint arrow-heads and stone axes for the benefit of English antiquarians, and earns good profits by it: I should like to give him an order for ribbed obsidian razors and spear-heads; I don't think he would make much of them.
[Illustration: AZTEC KNIFE OF CHALCEDONY, MOUNTED ON A WOODEN HANDLE, WHICH IS SHAPED LIKE A HUMAN FIGURE WITH ITS FACE APPEARING THROUGH AN EAGLE-HEAD MASK, AND HAS BEEN INLAID WITH MOSAIC WORK OF MALACHITE, SHELL, AND TURQUOISE.

LENGTH 12-1/2 INCHES.] The wonderful similarity of character among the stone weapons found in different parts of the world has often been used by ethnologists as a means of supporting the theory that this and other arts were carried over the world by tribes migrating from one common centre of creation of the human species.