All this agitation did not escape the notice of the bird on the floor, who stood silent, plainly understanding, and waiting for the next move. Finally the mocking-bird started, gracefully and without haste. He first flew easily and lightly to the desk, in a moment to the back of a chair, then deliberately to an arm, next to the seat, and lastly to a round; at each step pausing, shaking himself, and threatening. When he reached the floor, he ran a few steps toward the thrush, stopped short, erected himself very straight, and puffed out as big as possible; then another little run, and the operation was repeated. He proceeded till within a foot of the thrush, when he alternated the upright position with a lowered head, and bill pointed toward the foe, changing from one to the other very suddenly. When he came so near, the thrush crouched flat on the floor, with beak turned squarely against the approaching bird, and thus awaited the onslaught. In that attitude the mocking-bird did not apparently like to attack him. He threatened a long time, then retreated gradually, making feints, turning, running a few inches, and bringing up suddenly with a half turn back. In this manner he moved away for some distance, then flew to the round of the chair, the seat, the arm, the back, and so on till he reached the ladder again. Then for the first time the thrush changed his position and rose to his feet, when, without the least warning, the mocker flung himself madly after him, and the thrush, unprepared, ran, with a sharp cry. Obviously the mocking-bird, finding the first method of attack, which was probably his usual one, a failure, decided to try another, as the event proved, successfully. The excitement of this performance evidently gave him pleasure, no doubt helped to pass away the long hours, for be often indulged in it, always making his approach in the same deliberate way, tripping daintily a step or two at a time, examining everything in a careless way, tasting a piece of apple-skin, lifting a bit of thread, toying and dallying to all appearance, as he moved, still always advancing, and never turning aside from his purpose till he reached the distance of a foot from the thrush, crouching motionless with crown feathers erect. At that point he often stood a moment, looking grimly at his victim, then gave a quick, exaggerated jump which carried him forward not more than an inch, but sent the thrush, in a panic, running half across the room, where he brought up in a heap,--his claws sprawled as they slipped on the matting, every feather standing up,--and made no attempt to draw his feet together. A slow, formal attack he could meet, but a sudden rush was irresistible. Then the assailant turned, slowly, gracefully, the personification of tranquillity, his air saying, "Who's done anything?" yet taking a direct line for the enemy, approaching in the same way, by easy stages, but relentlessly drawing nearer and nearer, till he ended by a quick plunge,