In his belt was stuck a long, double-edged hunting-knife, having its wooden handle neatly bound with black waxed thread. A five-foot bow of second-growth hickory leaned against the log beside him, but it was unstrung, and the quiver of arrows, suspended by a strap from his shoulders, had been allowed to shift from its proper position so that it hung down the middle of his back and was, consequently, out of easy hand-reach. But the youth was in no apparent fear of being surprised by the advent of an enemy; certainly he had made no provision against such a contingency, and the carelessness of his attitude was entirely unaffected. It may be remarked that the arrows aforesaid were iron-tipped instead of being simply fire-hardened, and in the feathering of each a single plume of the scarlet tanager had been carefully inserted. Presumably, the vermilion feather was the owner's private sign of his work as a marksman. So far the lad's dress and accoutrements were in entire conformity to the primeval rusticity of his surroundings. Judge, then, of the reasonable surprise which the observer might feel at discovering that the object in the boy's hand was nothing less incongruous than a pair of binocular glasses, an exquisitely finished example of the highest art of the optician. One of the eye-piece lenses had been lost or broken, for, as the youth raised the glasses to sweep again the distant sea-line, he covered the left-hand cylinder with a flat, oblong object--a printed book. Its title, indeed, could be clearly read as, a moment after, it lay partly open upon his knee--_A Child's History of the United States_--and across the top of the page had been neatly written in charcoal ink, "Constans, Son of Gavan at the Greenwood Keep." Mechanically, the boy began turning the leaves, stopping finally at a page upon which was a picture of the lower part of New York City as seen from the bay. Long and earnestly he studied it, looking up occasionally as though he would find its visible presentment in that dark blur on the horizon line. "It must be," he muttered, with a quick intake of his breath. "The Forgotten City and Doom the Forbidden--one and the same. Well, and what then?" and again he fell upon his dreaming. For the best part of an hour the boy had sat almost motionless, looking out across the water. Then, suddenly, he turned his head; his ear had caught a suspicious sound, perhaps the dip of an oar-blade. Thrusting the field-glass and book into his bosom, he drew the bow towards him and listened. All was still, except for the chatter of a blue-jay, and after a moment or so his attention again relaxed. But his eyes, instead of losing themselves in the distance as before, remained fixed upon the sand at his feet. Fortunately so, or he must have failed to notice the long shadow that hung poised for an instant above his right shoulder and then darted downward, menacing, deadly.