This being the case, one asks how they can possibly have dealt at will upon the hardest rocks, even upon such as we ourselves hesitate to attack, namely, diorite, basalt, and the granite of Syene.

The manufacturers of antiquities who sculpture granite for the benefit of tourists, have found a simple solution of this problem.

They work with some twenty common iron chisels at hand, which after a very few turns are good for nothing.

When one is blunted, they take up another, and so on till the stock is exhausted.

Then they go to the forge, and put their tools into working order again.