When a wolf approaches near and endeavors to make a breach in the circle, the musk-ox nearest him tries to get him, and will even rush out of the line for a short and brief pursuit. But the bull does not pursue more than twenty yards or so, for fear of being surrounded alone and cut off. At the end of his usually futile run, back he goes and carefully backs into his place in the first line of defense. A charging bull does not rush out far enough that the wolves can cut him off and kill him. He is much too wise for that. Mr. Stefansson says that the impregnability of the musk-ox defense is so well recognized by the wolves of the North that often a pack will march past a herd in close proximity without offering to attack it, and without even troubling the herd to form the hollow circle. A Savage Wild Boar. I once had a "fight" with a captive Japanese wild boar, under conditions both absurd and tragic, and from it I learned the courage and fury of such animals. The animal was large, powerful, fearfully savage toward every living thing, and insanely courageous. It was confined in a yard enclosed by a strong wire fence, and while we were all very sure that the fence would hold it, I became uneasy. In mid-afternoon I went alone to the spot, passing hundreds of school children on the way, to study the situation. When I reached the front of the corral and stood still to look at the fence, the boar immediately rushed for me. He came straight on, angry and terrible, and charged the wire like a living battering-ram. He repeated these charges until I became fearful of an outbreak, and decided to try to make him afraid to repeat them. Procuring from the bear dens, a pike pole with a stout spike in the end, I received the next charge with a return thrust meant to puncture both the boar's hide and his understanding. He backed off and charged more furiously than ever, with white foam flying from his jaws. He cared nothing for his punishment. He charged until his snout bled freely, and the fence bulged at the strain. Then I became regularly scared! I feared that the savage beast would break through the fence in spite of its strength, and run amuck among those helpless children. I "beat it" back to my office, hurried back with one of my loaded rifles, and without losing a second put a bullet through that raging brain and ended that danger forever.