"Steady, old boy, steady," returned the mountaineer's calm voice. "The first thing you must do, you know, is to keep a firm grip on yourself. If you lose your nerve I'll have you on my hands too."

Under his companion's eye, the artist controlled himself. "You're right, Brian," he said calmly. "What do you want me to do? You know best, of course."

The officer, still watching him, said slowly, "I want you to spend the day on that point, up there,"--he pointed to the clump of pines,--"with this glass." He turned to take an extra field-glass from his saddle. Handing the glass to the other, he continued "You can see all over the country, on the Galena Valley side of this range, from there." Again he paused, as though reluctant to give the final word of his instructions.

The young man looked at him, questioningly. "Yes?"

The Ranger answered in a low tone, "You are to watch for buzzards, Aaron."

Aaron King went white. "Brian! You think--"

The answer came sharply, "I am not thinking. I don't dare think. I am only recognizing every possibility and letting nothing, nothing, get away from me. I don't want you to think. I want you to do the thing that will be of greatest service. It's because I am afraid you will think, that I hesitate to assign you to the position."

The sharp words acted like a dash of cold water in the young man's face. Unconsciously, he straightened in his saddle. "Thank you, Brian. I understand. You can depend upon me."

"Good boy!" came the hearty and instant approval. "If you see anything, go to it; leaving a note here, under a stone on top of this rock; I'll find it to-night, when I come back. If nothing shows up, stay until dark, and then go down to Carleton's. I'll be in late. The rest of the party will stay over at Pine Glen."

Alone on the peak where he had sat with Sibyl the day of their last climb, Aaron King watched for the buzzards' telltale, circling flight--and tried not to think.