He made no answer; he, too, grew silent. And for a long while they sat and watched the embers of the fire; and the day waned. Slowly the sun set in its glory over the virgin hills; the far eastern spaces of the sky grew bathed in tender lavenders and purples. Haze drew its veils across the world, and the air grew brown with evenfall. Presently the girl arose, to throw more wood on the fire. Clad only in her loose tiger-skin, clasped with gold, she moved like a primeval goddess. Stern marked the supple play of her muscles, the unspoiled grace and strength of that young body, the swelling warmth of her bosom. And as he looked he loved; he pressed a hand to his eyes; for a while he thought--it was as though he prayed. Evening came on--the warm, dark, mysterious night. Off there in the shallows gradually arose the million-voiced chorus of frogs, shrill and monotonous, plaintive, appealing--the cry of new life to the overarching, implacable mystery of the universe. The first faint silvery powder of the stars came spangling out along the horizon. Unsteady bats began to reel across the sky. The solemn beauty of the scene awed the woman and the man to silence. But Stern, leaning his back against the bole of the great oak, encircled Beatrice with his arm. Her beautiful dear head rested in the hollow of his throat; her warm, fragrant hair caressed his cheek; he felt the wholesome strength and sweetness of this woman whom he loved; and in his eyes--unseen by her--tears welled and gleamed in the firelight. Beatrice watched, like a contented child, the dancing showers of sparks that rose, wavering and whirling in complex sarabands--sparks red as passion, golden as the unknown future of their dreams. From the river they heard the gentle lap-lap-lapping of the waves along the shore. All was rest and peace and beauty; this was Eden once again--and there was no serpent to enter in. Presently Stern spoke. "Dear," said he, "do you know, I'm a bit puzzled in some ways, about--well, about night and day, and temperature, and gravitation, and a number of little things like that. Puzzled. We're facing problems here that we don't realize fully as yet." "Problems? What problems, except to make our home, and--and live?" "No, there's more to be considered than just that. In the first place, although I have no timepiece, I'm moderately certain the day and night are shorter now than they used to be before the smash-up. There must be a difference of at least half an hour. Just as soon as I can get around to it, I'll build a clock, and see. Though if the force of gravity has changed, too, that, of course, will change the time of vibration of any pendulum, and so of course will invalidate my results. It's a hard problem, right enough." "You think gravitation has changed?" "Don't you notice, yourself, that things seem a trifle lighter--things that used to be heavy to lift are now comparatively easy?"