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"There must have been battlements which have been filled in since," observed Prince Rénine. "Look here, there were loop-holes at one time. They may have been blocked."

"In any case," she said, "the telescope was of no use up here either and we may as well go down again."

"I don't agree," he said. "Logic tells us that there must have been some gap through which the country could be seen and this was the spot where the telescope was used."

He hoisted himself by his wrists to the top of the parapet and then saw that this point of vantage commanded the whole of the valley, including the park, with its tall trees marking the horizon; and, beyond, a depression in a wood surmounting a hill, at a distance of some seven or eight hundred yards, stood another tower, squat and in ruins, covered with ivy from top to bottom.

Rénine resumed his inspection. He seemed to consider that the key to the problem lay in the use to which the telescope was put and that the problem would be solved if only they could discover this use.