Mulford, however, was not satisfied with a cursory glance, but went nearer to the spot where Tier was standing.  Then, indeed, he saw to what the steward alluded, and was impressed by it, though he said nothing.  Hundreds of little bubbles rose to the surface of the water, much as one sees them rising in springs.  These bubbles are often met with in lakes and other comparatively shallow waters, but they are rarely seen in those of the ocean.  The mate understood, at a glance, that those he now beheld were produced by the air which escaped from the hold of the wreck; in small quantities at a time, it was true, but by a constant and increasing process.  The great pressure of the water forced this air through crevices so minute that, under ordinary circumstances, they would have proved impenetrable to this, as they were still to the other fluid, though they now permitted the passage of the former.  It might take a long time to force the air from the interior of the vessel by such means, but the result was as certain as it might be slow.  As constant dropping will wear a stone, so might the power that kept the wreck afloat be exhausted by the ceaseless rising of these minute air-bubbles.

Although Mulford was entirely sensible of the nature of this new source of danger, we cannot say he was much affected by it at the moment.  It seemed to him far more probable that they must die of exhaustion, long before the wreck would lose all of its buoyancy by this slow process, than that even the strongest of their number could survive for such a period.  The new danger, therefore, lost most of its terrors under this view of the subject, though it certainly did not add to the small sense of security that remained, to know that inevitably their fate must be sealed through its agency, should they be able to hold out for a sufficient time against hunger and thirst.  It caused Mulford to muse in silence for many more minutes.

“I hope we are not altogether without food,” the mate at length said.  “It sometimes happens that persons at sea carry pieces of biscuit in their pockets, especially those who keep watch at night.  The smallest morsel is now of the last importance.”

At this suggestion, every one set about an examination.  The result was, that neither Mrs. Budd nor Rose had a particle of food, of any sort, about their persons.  Biddy produced from her pockets, however, a whole biscuit, a large bunch of excellent raisins that she had filched from the steward’s stores, and two apples,—­the last being the remains of some fruit that Spike had procured a month earlier in New York.  Mulford had half a biscuit, at which he had been accustomed to nibble in his watches; and Jack lugged out, along with a small plug of tobacco, a couple of sweet oranges.  Here, then, was everything in the shape of victuals or drink, that could be found for the use of five persons, in all probability for many days.  The importance of securing it for equal distribution, was so obvious, that Mulford’s proposal to do so met with a common assent.  The whole was put in Mrs. Budd’s bag, and she was intrusted with the keeping of this precious store.