"Jump up, young un," Bill said; "and you, Jack, get off your sea-boots. You stand just behind me and hold on, I feel much steadier now that I have got Joe on my shoulders. If you feel that you are going, leave go of me, you will only pull me backward holding on; and as you can swim you are all right. You have only got to keep yourself afloat, the tide will drift you up to the island in no time."