Then, relying upon the isolation of his perch for safety, he wrapped himself in the invaluable serape and lay down.  The night was cold as usual, and a sharp wind blew down from northern peaks and ranges, but Ned, protected by vegetation and the heavy serape, had an extraordinary feeling of warmth and snugness as he lay on the old pyramid.  Held so long within close walls the wild freedom and the fresh air that came across seas and continents were very grateful to him.  Even the presence of an enemy, so near, and yet, as it seemed, so little dangerous, added a certain piquancy to his position.  The pleasant tinkle of the mandolins was wafted upward to him, and it was wonderfully soothing, telling of peace and rest.  He inhaled the aromatic odors of strange and flowering southern plants, and his senses were steeped in a sort of luxurious calm.

He fell asleep to the music of the mandolin, and when he awoke such a bright sun was shining in his eyes that he was glad to close and open them again several times before they would tolerate the brilliant Mexican sky that bent above him.  He lay still about five minutes, listening, and then, to his disappointment, he heard sounds below.  He judged by the position of the sun that it must be at least 10 o’clock in the morning, and the Mexicans should be gone.  Yet they were undoubtedly still there.  He crept to the edge of the pyramid and looked over.  There was the Mexican force, scattered about the ruined city, but camped in greatest numbers along the Calle de los Muertos.  Their numbers had been increased by two hundred or three hundred, and, as Ned saw no signs of breaking camp, he judged that this was a rendezvous, and that there were more troops yet to come.

He saw at once that his problem was increased greatly.  He could not dream of leaving the summit of the pyramid before the next night came.  Food he had in plenty but no water, and already as the hot sun’s rays approached the vertical he felt a great thirst.  Imagination and the knowledge that he could not allay it for the present at least, increased the burning sensation in his throat and the dryness of his lips.  He caught a view of the current of the Teotihuacan, the little river by the side of which the pyramids stand, and the sight increased his torments.  He had never seen before such fresh and pure water.  It sparkled and raced in the sun before him and it looked divine.  And yet it was as far out of his reach as if it were all the way across Mexico.

Ned went back to the place where he had slept and sat down.  The sight of the river had tortured him, and he felt better when it was shut from view.  Now he resolved to see what could be accomplished by will.  He undertook to forget the water, and at times he succeeded, but, despite his greatest efforts, the Teotihuacan would come back now and then with the most astonishing vividness.  Although he was lying on the serape with bushes and shrubs all around, there was the river visible to the eye of imagination,