chunk: Over the next three days, Tweel shows the Earthmen around the city, including a solar-powered pumping station designed to move water down the canal. Finally, a mile south of the ancient Martian city, the Earthmen find a valley filled with dream-beasts. As the dream-beasts mesmerize them, the two Earthmen see everything they have ever desired spread out before them, and rush forward helplessly. Tweel attacks one of the dream-beasts, momentarily freeing Jarvis. The Earthman kills the dream-beast with a pistol shot, then kills another that is attacking Leroy, and the three of them flee the valley. Jarvis and Leroy return to their rocket to recover from their encounter with the dream-beasts.
  Before returning to the Ares, as a parting gift, the Earthmen take Tweel to the wreck of the other rocket, and give it the rocket's atomic power plant. In time, the Thoth will be able to master atomic power, and will no longer be dependent on solar power to run their civilization.