This at first caused them surprise, as well as alarm. The former affected them only for an instant. The explanation was sought for, and suggested to the satisfaction of all. The sandspit did not project perpendicularly from the line of the coast, but in a diagonal direction. It was, in fact, a sort of natural breakwater, forming one side of a large cone, or embayment, lying between it and the true beach. This feature had been observed on their first setting foot upon it, though at the time they were so much engrossed with the joyous thought of having escaped from the sea, that it had made no impression upon their memory. They now remembered the circumstance, though not to their satisfaction, for they saw at once that the guide in which they had been trusting could no longer avail them. The waves were rolling on over that bay, whose depth they had tried, only to find it unfordable. This was a new dilemma. To escape from it there appeared but one way. They must keep their course along the combing of the peninsula, if they could. But their ability to do so had now become a question, each instant growing more difficult to answer. They were no longer certain that they were on the spit; but, whether or not, they could find no shallower water by trying on either side. Each way they went it seemed to deepen; and even if they stood still but for a few moments, as they were compelled to do while hesitating as to their course, the water rose perceptibly upon their limbs. They were now well aware that they had two enemies to contend with, time and direction. The loss of either one or the other might end in their destruction. A wrong direction would lead them into deep water; a waste of time would bring deep water around them. The old adage about time and tide, which none of them could help having heard, might have been ringing in their ears at that moment. It was appropriate to the occasion. They thought of it; and the thought filled them with apprehension. From the observations they had made before sunset, they knew that the shore could not be near, not nearer than three miles, perhaps four. Even with free footing, the true direction, and a clear view of the path, it might have been a question about time. They all knew enough of the sea to be aware how rapidly the tide sets in, especially on some foreign shores, and there was nothing to assure them that the seaboard of the Saara was not beset by the most treacherous of tides. On the contrary, it was just this, a tidal current, that had forced their vessel among the breakers, causing them to become what they now were, castaways! They had reason to dread the tides of the Saara's shore; and dread them they did, their fears at each moment becoming stronger as they felt the dark waters rising higher and higher around them! CHAPTER SIX. WADE OR SWIM?