The housekeeping by no means took up all the girl's time. Often she went out with him on what he called his "pirating expeditions," that now sometimes led them as far afield as the sad ruins of the wharves and piers, or to the stark desolation and wreckage of lower Broadway and the onetime busy hives of newspaperdom, or up to Central Park or to the great remains of the two railroad terminals. These two places, the former tide-gates of the city's life, impressed Stern most painfully of anything. The disintegrated tracks, the jumbled remains of locomotives and luxurious Pullmans with weeds growing rank upon them, the sunlight beating down through the caved-in roof of the Pennsylvania station "concourse," where millions of human beings once had trod in all the haste of men's paltry, futile affairs, filled him with melancholy, and he was glad to get away again leaving the place to the jungle, the birds and beasts that now laid claim to it. "Sic transit gloria mundi!" he murmured, as with sad eyes he mused upon the down-tumbled columns along the facade, the overgrown entrance-way, the cracked and falling arches and architraves. "And _this_, they said, was builded for all time!" It was on one of these expeditions that the engineer found and pocketed--unknown to Beatrice--another disconcerting relic. This was a bone, broken and splintered, and of no very great age, gnawed with perfectly visible tooth-marks. He picked it up, by chance, near the west side of the ruins of the old City Hall. Stern recognized the manner in which the bone had been cracked open with a stone to let the marrow be sucked out. The sight of this gruesome relic revived all his fears, tenfold more acutely than ever, and filled him with a sense of vague, impending evil, of peril deadly to them both. This was the more keen, because the engineer knew at a glance that the bone was the upper end of a human femur--human, or, at the very least, belonging to some highly anthropoid animal. And of apes or gorillas he had, as yet, found no trace in the forests of Manhattan. Long he mused over his find. But not a single word did he ever say to Beatrice concerning it or the flint spear-point. Only he kept his eyes and ears well open for other bits of corroborative evidence. And he never ventured a foot from the building unless his rifle and revolver were with him, their magazines full of high-power shells. The girl always went armed, too, and soon grew to be such an expert shot that she could drop a squirrel from the tip of a fir, or wing a heron in full flight. Once her quick eyes spied a deer in the tangles of the one-time Gramercy Park, now no longer neatly hedged with iron palings, but spread in wild confusion that joined the riot of growth beyond. On the instant she fired, wounding the creature.