`` that rain-forest is promising , '' laurence had said tiredly , wiping his brow ; there had been a great deal of activity in their absence-lean-tos had gone up to shelter a supply of dry wood , and a cellar dug for the barrels of salt pork ; the one cauldron which had been left them was boiling away ceaselessly to make their dinner-which had become breakfast when forthing unloaded the turtle eggs .