"Since the first method is impractical what can be used in carrying out the second?"
"We've set ourselves the goal of discovering that. We're hoping to synthesize the necessary chemical compound to accomplish it."
"It would have to be a colloid, too, capable of suspension in the atmosphere," said Ken.
"Correct."
"If we do find such a substance we still have the problem of decontaminating existing metals. We couldn't build a moving piece of machinery out of any metal now in existence without first cleaning the dust out of its surface."
"That's part of the problem, too," said his father.
Ken resumed his duties in the laboratory the following morning. Dr. Adams had warned him not to walk up College Hill, so he had borrowed the horse Dave Whitaker still had on loan from his uncle. He felt self-conscious about being the only one enjoying such luxury, but he promised himself he would go back to walking as soon as Dr. Adams gave permission.
On the third day, the horse slipped and fell as it picked its way carefully down the hill. Ken was thrown clear, into the deep snow, but the horse lay where it had fallen, as if unable to move. Ken feared the animal had broken a leg. He felt cautiously but could find no evidence of injury.
Gently, he tugged at the reins and urged the horse to its feet. The animal finally rose, but it stood uncertainly and trembled when it tried to walk again.