e a man's or a woman's."
"I think, under the circumstances, I would be excused for omitting that," was the reply.
"You said you heard something that you thought must be a rat," went on The Thinking Machine. "What was this?"
"I don't know."
"Any squeak about it?"
"No, not that I noticed."
"Five years since the house was occupied," mused the scientist. "How far away is the water?"
"The place overlooks the water, but it's a steep climb of three hundred yards from the water to the house."
That seemed to satisfy The Thinking Machine as to what actually happened.
"When you went over the house in daylight, did you notice if any of the mirrors were dusty?" he asked.
"I should presume that all were," was the reply. "There's no reason why they should have been otherwise."
"But you didn't notice particularly that some were not dusty?" the scientist insisted.
"No. I merely noticed that they were there."
The Thinking Machine sat for