SO MANY BOULDERS PROTRUDED through the moth-eaten tarp of dirt stretched over this land, that they had to stop and alight from the carriage, which had become more trouble than it was worth. They must either walk, or ride on arguably domesticated Dartmoor ponies. Newcomen walked. Daniel elected to ride. He was ready to change his mind if the pony turned out to be as ill-tempered as it looked. The ground underfoot was a wildly treacherous composite of boulders, and grass-tufts as soft as goose-down pillows. The pony’s attention was so consumed by deciding, from moment to moment, where it should place all four of its hooves, that it seemed to forget there was an old man on its back. The track ran north parallel to a small water-course below and to their left. It was only visible about a third of the time, but helpfully marked out by a breadcrumb-trail of steaming horse-patties left by those who had gone before them.