The treehouse that the Hemulen was building collapses, and so instead Snufkin takes him sailing in his boat, though the Hemulen realises that he gets sea-sick, and after the trip leaves to go home.
The Hemulen's treehouse collapses, prompting an alternative activity with Snufkin on a boat trip, although the Hemulen suffers from motion sickness after the excursion and decides to return home.