Thus we went on laughing and joking, perfectly contented, and thinking only of the present moment.  We forgot that our fuel would soon be expended; that the position we occupied would be a very unpleasant one on which to pass a cold and perhaps rainy night; and that our friends would become really alarmed should we not make our appearance at the boat.  These considerations did not begin to weigh with us till we had finished our dinner.  When, however, we had time for reflection, we were not quite so well contented with ourselves.