It was indeed fortunate for him that the mink was intent upon other game, or his hiding-place would have been quickly detected. The mink was in pursuit of a big trout and had no eyes for other inhabitants of the stream. He forged swiftly ahead in the wake of the fleeing trout and soon passed from sight, though the muskrat remained for some time in his retreat, afraid to venture forth. As the animal did not return, he at last slid out and turned upstream, keeping near the shore, ready to dart into hiding at the least sign of danger. He reached home without mishap, and drew a breath of relief as he settled for a nap on his warm dry bed. About a week later the big muskrat was again feeding some distance down stream. His fright was forgotten and he was happy as could be, digging in the oozy stream bed for flag roots, raising his head occasionally, his face and whiskers covered with soft mud through which his eyes shone comically as he contentedly chewed a juicy root. Having eaten his fill he climbed out into an air space where the water had receded and the ice made a thick protection over his head, and proceeded to make his toilet. His fur was soon as clean and dainty as if it had never come into contact with the soil. He was thinking of returning home, when a number of small trout darted past him in a frenzied manner and vanished upstream. The muskrat gave one look, then he, too, took to the water, swimming with long powerful strokes, fear seeming to lend him power. The mink steadily gained upon him, and when the muskrat at length reached his subterranean entrance his enemy was close behind. Now the mink, though a powerful swimmer, cannot hold his breath long under water and, at the time he sighted the muskrat, he was feeling the need of replenishing his supply of air. Knowing, however, that he would never be able to overtake his game if he paused now, he forged steadily ahead, his lungs feeling as if they would burst. As the muskrat darted into his passage, the mink was close behind, his bloodthirsty jaws not a yard from the feet of the pursued. There the mink hesitated a moment. He had entered many of these tortuous, subterranean passages and knew that if it were very long, he would not be able to hold his breath to the end and would perish in its darkness. Moreover, the muskrat would have the advantage of being on familiar ground.