"That's their engineering," gibed he, as the little boat sailed under and they looked up like dwarfs at the legs of a Colossus. "The old Roman bridges are good for practically eternity, but these jerry steel things, run up for profits, go to pieces in a mere thousand years! Well, the steel magnates are gone now, and their profits with them. But this junk remains as a lesson and a warning, Beta; the race to come must build better than this, and sounder, every way!" On, on they sailed, marveling at the terrific destruction on either hand--the dense forests now grown over Brooklyn and New York alike. "We'll be there before long now," said Allan. "And if we have any luck at all, and nothing happens, we ought to be started for home by nightfall. You don't mind a moonlight sail up the Hudson, do you?" It was past four by the time the banca nosed her way slowly in among the rotten docks and ruined hulks of steamships, and with a gentle rustling came to rest among the reeds and rushes now growing rank at the foot of what had once been Twenty-Third Street. A huge sea-tortoise, disturbed, slid off the sand-bank where he had been sunning himself and paddled sulkily away. A blue heron flapped up from the thicket, and with a frog in its bill awkwardly took flight, its long neck crooked, legs dangling absurdly. "Some mighty big changes, all right," commented Stern. "Yes, there's got to be a deal of work done here before things are right again. But there's time enough, time enough--there's all the time we need, we and the people who shall come after us!" They made the banca fast, noting that the tide was high and that the leather cord was securely tied to a gnarled willow that grew at the water's edge. Half an hour later they had made their way across town to Madison Avenue. It was with strange feelings they once more approached the scene of their battle against such frightful odds with the Horde. Stern was especially curious to note the effect of his Pulverite, not only on the building itself but on the square. This effect exceeded his expectations. Less than two hundred feet of the tower now stood and the whole western facade was but a mass of cracked and gaping ruin. Out on the Square the huge elms and pines had been uprooted and flung in titanic confusion, like a game of giants' jack-straws. And vast conical excavations showed, here and there, where vials of the explosive had struck the earth. Gravel and rocks had even been thrown over the Metropolitan Building itself into the woodland glades of Madison Avenue. And, worse, bits of bone--a leg-bone, a shoulder-blade, a broken skull with flesh still adhering--here or there met the eye.