Soaring strongly even under the additional weight, humming with the rush of air, the plane made the last turn of her spiral and straightened out at the height of twelve hundred feet for her long northward run across the unbroken wilderness.
Stern preferred to fly a bit high, believing the air-currents more dependable there. Even as he rose above the forest-level, his experienced eye saw possible trouble in the wind-clouds banked to eastward and in the fall of the barometer. But with the thought, "At this rate we'll make Boston in three-quarters of an hour at the outside, and the storm can't strike so soon," he pushed the motor to still greater speed and settled to the urgent business of steering a straight course for Massachusetts Bay.
Only once did he dare turn aside his eyes even so much as to glance at Beatrice. She, magnificently unafraid on the quivering back of this huge airdragon, showed the splendid excitement of the moment by the sparkle of her glance, the rush of eloquent blood to her cheeks.
Stern's achievement, typical of the invincible conquest of the human soul over matter, time and space, thrilled her with unspeakable pride. And as she breathed for the first time the pure, thin air of those upper regions, her strong heart leaped within her breast, and she knew that this man was worthy of her most profound, indissoluble love.
Far down beneath them now the forest sped away to southward. The gleam of the river, dulled by the sunless sky, showed here and there through the woods, which spread their unbroken carpet to the horizon, impenetrable and filled with nameless perils. At thought of how he was cheating them all, Stern smiled to himself with grim satisfaction.
"Good old engine!" he was thinking, as he let her out another notch. "Some day I'll put you in a boat, and we'll go cruising. With you, there's no limit to the possibilities. The world is really ours now, with your help!"
Behind them now lay the debris of Pawtucket. Stern caught a glimpse of a ruined building, a crumpled-in gas-tank with an elm growing up through the stark ribs of it, a jumble of wreckage, all small and toylike, there below; then the plane swooped onward, and all lay deep buried in the wilderness again.
"A few minutes now," he said to himself, "and we'll be across what used to be the line, and be spinning over Massachusetts. This certainly beats walking all hollow! Whew!" as the machine lurched forward and took an ugly drop. He jerked the rising-plane lever savagely. "Still the same kind of unreliable air, I see, that we used to have a thousand years ago!"