Now, all this seems contrary to the laws of nature and mathematics; but it is all right, and all the eccentric movements of the boomerang can be accounted for on scientific principles. Projectile force, rotary motion, and gravitation do it all, and though these are big words they mean something. You must not expect to throw it successfully without long practice. It is dangerous, too, in the hands of a beginner, for it is then that it “shows off,” and is liable to run wild and chase some bystander in a most vigorous manner. It is all very amusing to see a man running to escape, but he invariably runs the wrong way; and, if hit, it might be a serious matter for him.