For some reason--perhaps because the mosquitoes had so cruelly maltreated him--Joe was not sleepy, and after having lain awake a long time while the other boys were sleeping soundly, he began to feel lonesome. He heard a great many mysterious noises, as any one who lies awake in a tent always does. The melancholy call of the loon sounded ghostly, and the sighing of the wind in the trees seemed to him like the breathing of huge animals. After a while he found himself getting nervous as well as lonesome, and imagined that he saw shadows of strange objects passing in front of the tent. By-and-by he distinctly heard the twigs and branches crackling, as somebody or something moved through the woods. The noise came nearer, and suddenly it flashed upon Joe that a bear was approaching. He crept carefully to the opening of the tent, and putting his head out, saw indistinctly a large animal moving slowly in the shadow of the bushes only three or four rods from him. Joe lost no time in waking up the other boys, cautioning them as he did so not to make the least noise. "There's a bear close by the tent," he whispered. "I've been listening to him for a long while, and just now I saw him." Harry immediately grasped the gun, both barrels of which he had loaded before going to sleep. Tom wished that he had the hatchet, but as it had been left in the boat, he had no weapon but his penknife. Thus armed, the two crept stealthily out of the tent to fight the bear, leaving Joe and Jim in a very unhappy state of mind, with nothing to defend themselves against the bear, in case he should attack the tent, except a tooth-brush and a lantern. The outline of the animal could be seen, but Tom and Harry could not make out which end of it was its head. "You must shoot him just behind the shoulder," whispered Tom; "that's the only spot where you can kill a bear." Harry said nothing, but watched carefully to see the animal move. Presently it threw up either its head or tail--the boys could not tell which--and started toward them. Harry forgot all about shooting at the shoulder, but in his excitement fired at the animal generally, without picking out any particular spot in which to plant his shot. The effect of the shot was surprising. The bear set up a tremendous bellow, and by the flash of the gun the boys saw their dreaded enemy galloping away, with its horns and tail in the air. Tom burst into a loud laugh. "Come out, Joe," he cried. "Your bear's gone home to be milked--that is, if Harry hasn't mortally wounded her." Fortunately Harry had made a miss; and he found his whole charge of shot the next morning in the trunk of a big white birch-tree. The innocent cow that Joe had mistaken for a bear was, however, so thoroughly frightened that she did not come near the camp again.