When the first eagle, smitten with fear by the vision of the swiftly mounting aeroplane, fled back to his eyrie to warn his fierce-eyed mate of this portentous monster of the air, his perturbation was detected by the female of the next pair, who chanced to be homing at that moment with a fish for her hungry nestlings. Fear seems to travel by some uncomprehended but very efficient wireless, and fear in the lords of the air was a thing too unusual to be ignored. Hastily depositing her burden, the newcomer flapped upward and around to the east, till she, too, caught sight of the mounting monoplane. It was far off, indeed, but already so high above earth that to her eyes it stood out dark and sinister against the pale expanse of sea beyond the town. She flapped over for a nearer view, flew close enough to hear the mysterious roar of the motor and to detect the man-creature riding the monster's neck, and fled back to her nestlings with rage and terror at her heart. No longer could she feel secure on the dizziest and remotest ledges of the peaks, no longer were even the soundless deeps of sky inaccessible to man! Within an hour every eagle of Bald Face knew of this dreadful invasion of their hitherto impregnable domain. It was the time of year when their nestlings were most helpless, and that is the time of year when the white-headed eagles will face all odds with an incomparable ferocity of valor at the hint of menace to their skyey homes.

* * * * * *

The airman at the town of X—— was one Rob MacCreedy, who had recently been making a name for himself at the aviation grounds some hundred miles down the coast. He had come up to X—— primarily to turn a needed penny by exhibition flights and passenger-carrying over the spacious and level fields behind the town. But his secondary object was to experiment with the dangerous eddies and wind-holes that were likely to be met with above the profound ravines of Bald Face and its buttressing hills. His purpose was to go to Europe and win fame by some sensational flights over the Alps or the Pyrenees; and having a very practical Canadian ambition to survive for the enjoyment of the fame he planned to win, he was determined to prepare himself effectively for the perils that would confront him.

But MacCreedy had another object in view, which he did not talk about lest matter-of-fact folk should call him childish. He wanted to see what there was on top of Old Bald Face. That gaunt gray summit was regarded as practically unscalable. It had indeed been scaled, men said, some thirty or forty years ago, after desperate effort and altogether hair-raising adventure, by a greatly daring trapper, who had barely survived to tell of his exploit. Since then, the men of X—— not being wholehearted or skilled mountain-climbers, all such attempts had ended in failure. Among the legends which had gathered about the austere summit, there was none to suggest that gold might be found thereon, else the cloudy sanctuary had doubtless been violated without unnecessary delay. But the traditions handed down from the adventure of that old trapper were as stimulating to MacCreedy's imagination as any myth of quartz vein or nugget could have been. They told of a remarkable level plateau, like a table for the gods, with a little lake of black crystal set in the center of it, ice cold and of unfathomable depth. It was, in effect, according to tradition, bottomless.

To MacCreedy's eager and boyish imagination this lofty plateau and this mysterious uninvestigated lake were irresistible. He was determined to know more about them both; and as the top of Bald Face, for all its inaccessibility, was less than five thousand feet above sea-level, his monoplane seemed to offer him an easy way to it.

The third day after MacCreedy's arrival at X—— was windless and without a cloud in the blue. The air almost sparkled with its clarity, and there was an unspringlike tang in it which made MacCreedy's nerves tingle for adventure. After he had given the crowd their money's worth in swift mountings and breath-taking vols-planés, he started off, at a height of some two thousand feet, toward the mountain, standing pallid and grim against the intense blue. He mounted swiftly as he went, and the spectators stared after him doubtfully, till they grasped his purpose.

"He's going to visit the top of Old Bald Face!" went the murmur round the crowded edges of the field. And a feeling that he might bring back some interesting information made them content to wait, without grumbling, for his return.

Since their first sight of the giant-winged monster soaring and humming over X——, the eagles of Bald Face had not dared to venture far from home in their foragings. Their nerves were raw with angry anxiety for their nests. MacCreedy, as he came within a mile or two of the mountain, took note of an eagle not far ahead, circling at a higher level than himself.

"The old bird thinks he can fly some," mused MacCreedy, "but I bet I'm going to give him the surprise of his life!"