He sprang into the saddle like one who had spent much of his time on horseback. Domino curvetted and pranced a little, being still full of mettle and spirits; but a very firm hand held him in. "Take the glass, and see if you can make out what it is," Frank remarked, as if he hardly knew himself, or felt like trusting his eyes. A minute later Bob lowered the glasses. "There's something on the ground, and I can catch a glimpse of what looks like a dun-colored hide through the tufts of buffalo grass. The yearling was red, you said, Frank? All right. Then I reckon we'll find her there; but not on her feet." "Come on!" As he said these curt words Frank let Buckskin have his head; and, accompanied by his chum, started at a full gallop over the level, in the direction of the spot where the dun-colored object had been sighted. Shortly afterward they topped a little rise, and pulled up. No need to doubt their eyes now. Just before them lay the mangled remains of the lame yearling, very little being left to tell the story of how the animal had met its fate. "Wolves!" said Frank, gloomily, as he sat looking down at the torn hide. "I don't know the signs as well as you, Frank, but I'd say the same from general indications. And they had a royal good feast, too. This makes a round half dozen head your father has lost in the last month, doesn't it?" asked Bob. "Seven, all told. When Bart Heminway told me he had noticed that one of those fine yearlings seemed lame, I wondered if something wasn't going to happen to it soon. And then, when we missed it from the herd last night, I guessed what had come about. They caught her behind the rest, and pulled her down. The poor thing didn't have a ghost of a show against that pack of savage wolf-dogs." "I'd like to have just one chance at them, that's all," grumbled Bob, as he let his hand fondle the butt of a modern repeating rifle, which he carried fastened to his saddle. "This is sure the limit, and it's just got to stop!" declared Frank, grimly. "Right now?" queried his chum, eagerly. Two pairs of flashing eyes met, the black ones sending a challenge toward the blue. "Why not?" said Frank, shutting his jaws hard, "the day is before us still; and we're well primed for the business of hunting that pack to their den. Look at that bunch of rocks a few miles off; that must be where they hang out, Bob! Queer that none of the boys have ever thought of hunting in this quarter for that old she-wolf Sallie, and her brood." "Then you think she did it, do you?" asked Bob. "Sure she did. You can see for yourself where her jaws closed on the throat of the poor yearling. Everybody knows her trademark. That sly beast has been the bane of the cattle ranches around here for several years. They got to calling her Sallie in fun; but it's been serious business lately; and many a cowboy'd ride two hundred miles for a chance to knock her over."