Their food supply reverted to such berries and fruits as they could gather in the fringes of the forest, for as yet they dared not penetrate far from the shore. To these they added a plentiful supply of clams, which they dug with sharp sticks, at low tide, far out across the sand-flats--toiling for all the world like two of the identical savages who in the long ago, a thousand or five thousand years before the white man came to America, had left shell-heap middens along the north Atlantic coast.
This shell-fish gathering brought the action of the tides to their careful attention. The tide, they found, behaved ire an erratic manner. Instead of two regular flows a day there was but one. And at the ebb more than two miles of beach and sea-bottom lay exposed below the spot where they had landed at the flood. Stern analyzed the probable cause of this phenomenon.
“There must be two regular tides,” he said, “only they're lost in the far larger flux and reflux caused by the vortex we escaped from. Any marine geyser like that, able to, suck down water enough from the sea to lay bare two miles of beach every day and capable of throwing a column of mist and spray like that across the sky, is worth investing gating. Some day you and I are going to know more about it--a lot more!”
And that was truth; but little the engineer suspected how soon, or under what surpassingly strange circus stances, the girl and he were destined to behold once more the workings of that terrible and mighty force.
On the third day Stern set himself to work on the problem of making fire. He had not even flint-and-steel now; nor any firearm. Had he possessed a pistol he could have collected a little birch-bark, sought out a rotten pine-stump, and discharged his weapon into the “punk,” then blown the glow to a flame, and almost certainly have got a blaze. But he lacked everything, and so was forced back to primitive man's one simplest resource--friction.
As an assistant instructor in anthropology at Harvard University, he had now and then produced fire for his class of expectant students by using the Peruvian fire-drill; but even this simple expedient required a head-strap and a jade bearing, a well-formed spindle and a bow. Stern had none of these things, neither could he fashion them without tools. He had, therefore, to resort to the still more primitive method of “fire-sawing,” such as long, long ago the Australian bushmen had been wont to practice.
He was a strong man, determined and persistent; but two days more had passed, and many blisters covered his palms ere--after innumerable experiments with different kinds of woods and varying strokes--the first tiny glow fell into the carefully scraped sawdust. And it was with a fast-beating heart and tremulous breath that he blew his spark to a larger one, then laid on his shredded strips of bark and blew again, and so at last, with a great up-welling triumph in his soul, beheld the flicker of a flame once more.
Exhausted, he carefully fed that precious fire, while the girl clapped her hands with joy. In a few moments more the evening air in the dim forest aisles was gladdened by the ruddy blaze of a camp-fire at the door of the lean-to, and for the first time smoke went wafting up among the branches of that primeval wood.
“Now for some real meat!” cried Stern with exultation. “To-morrow I go hunting!”
That evening they sat for hours feeding their fire with deadfalls, listening to the trickle of the little spring and to the night sounds of the forest, watching the bats flicker among the dusky spaces, and gazing at the slow and solemn march of the stars beyond the leafy fretwork overhead. Stern slept but little that night, in his anxiety to keep the fire fed; and morning found him eager to be at his work with throwing-sticks among the vistas of the wilderness.