Ping and Tah-nu-nu had had no good reason for complaining of their captivity. They had been well fed, they had each a magnificent handkerchief and a looking-glass medal, they had heard any number of new stories from the old Chiricahua, and they had seen how high the old manitou could make the spring jump when he heard good news. They were almost conscience-smitten to find how friendly were their feelings towards all those wicked cowboys and blue-coats, but they were sure that they could get over it all and be good Apaches again as soon as they should get out of that camp.

One thought came, every now and then, to trouble Tah-nu-nu. Colonel Evans had said that he meant to take Ping home with him and make a farmer of him, and Tah-nu-nu's mind drew a humiliating picture of The-boy-whose-ear-pushed-away-a-piece-of-lead come down to work in a cornfield with a hoe.

She spoke about it to Ping, and he replied with some awful reminders of stories he had heard of the cruel manner in which little Indian girls were sometimes treated by hardhearted pale-face squaws. She might have felt worse but for a memory she had of a beautiful ribbon given her by a white lady at the Reservation headquarters.Both of them knew that the cowboys and the blue-coats intended to march away early the next morning, and it added more than a little to their respect for the Apache manitou who managed the Cold Spring water-works. They believed that the great jump of the fountain had produced such an effect upon the pale-faces that their chiefs had determined to give up the pursuit of Kah-go-mish. The old Chiricahua was still detailed to watch the movements of the chief's children, but they were not tied up that night.

Neither had Cal been all day in the camp where he had been staked out the night before. He had seemed to listen so attentively to the stern warnings given him against any attempt at running away, and he had shown such good sense that very morning, that he was allowed to walk around as he pleased. He did so, and he succeeded in putting on an air of easy unconcern, although he knew that his movements were all closely noted by the keenest kind of human eyes. He could hardly for a moment be beyond the range of those of the dog-soldier police, but their watch was blindness itself compared to that of the squaws and the young people.

The boys, of all sizes, avoided coming too near him, but it was not long before he made up his mind that every large tuft of weeds around that camp contained a Mescalero in his teens or under them. Little six-year-olders stepped away from behind trees, or sauntered out of bushes, or seemed to have errands which led them right past him. All of his own faculties were in a state of strained wakefulness, and he did not allow such things to escape him."I'll see the whole camp, anyhow," he said to himself, somewhat late in the day, after he had become accustomed to the queer sort of freedom given him. "I won't give them any excuse for piling fire upon me, but I want to know all about this place."

The stream along which the camp lay was hardly more than two yards wide in many places, but it ran slowly and seemed to be deep. There were places clear of bushes, here and there, where it could be seen, and it had a black look, from the density of the shadows which lay upon it. It was good water, pretty cool, and the Apaches had taken some fine fish out of it, but there was something remarkable in the fact that it ran in a straight line.

Cal walked slowly on, glancing at lodge after lodge. Most of them were pretty well peopled, and one that was not so had a guard before it, for it contained the treasures of the Mexican pack-mule train. There was not an Apache in the band wicked enough to have stolen anything out of that storehouse lodge, and the solitary dog-soldier who lounged in front of it was not there as a protection against human thieves. He was to keep out dogs, snakes, and any other kind of "bad medicine" that might attempt an investigation of the good things the loss of which Colonel Romero's cavalry were at that time growling about. He probably had other duties, but none of them related to Pull Stick, and Cal sauntered on, barely catching a glimpse of a pair of Apache boys who were doing the same among the trees on the other side of the brook.

He had never seen finer trees, nor had he ever before noticed precisely such a run of water, for just a little distance beyond the last of the widely separated lodges he came to a point where the stream turned off at right angles.

"It never did that of its own accord," suddenly flashed into the mind of Cal, and he added, aloud: "Some time or other it was dug out!"

"Ugh!" exclaimed a voice behind him. "What Pull Stick see?"

Cal pointed to the water and tried to explain himself, startled as he was a little by finding Crooked Nose so near him.

The deeply wrinkled, forbidding face of the Apache brave put on a look of very dark solemnity as he lifted a hand and pointed at something about a hundred yards beyond the turn in the stream.

"Ugh!" he said. "Pull Stick good eye."

The first thing that caught Cal's attention was an enormous dead tree, whose gaunt, leafless arms reached grimly out above a great mound that it leaned over. He looked again, following the line of the water, and saw something else that was remarkable. The small rill which fed that long, deep, shadowed channel fell into it out of a massive stone tank. The masonry was overgrown with vegetation everywhere except at the place where the rill poured out.

At some unknown day, away back in the past, when not one of those old trees had been more than a sapling, some people had been civilized enough and prosperous enough to construct that granite reservoir.

Cal stared intently, for the shadows were beginning to deepen, and he knew that he would be interfered with if he went too far in his first ramble. The stone tank did not contain all the masonry over which the dead tree was leaning. The mound itself arose four-square.

"It's one of those Mexican pyramids," exclaimed Cal. "I've read about them. Didn't know that any of them were ever found away up here."

He may or may not have been correct about that, but in a moment more he turned to Crooked Stick.

"Sun go down?" he asked.

"Ugh! No. Pull Stick get heap water."

The deepening of the shadows had not been altogether because that notable day of Cal's life had nearly gone. It was rather because black masses of thunderclouds had suddenly arrived, and had hidden all the sky above that part of the ancient Aztec forest.

Swiftly enough came a darkness that walked in among the tree-trunks and covered them so that they could not be seen at twenty feet away.

A vivid gleam of quivering lightning made everything stand out clearly for a second. Then came a deafening roll of thunder, and that was followed by another burst of sound that Cal did not recognize. He did not even know the Apache word for cougar, which sprang to the lips of Crooked Nose. The beast which had uttered the terrified roar, however, came leaping past with tremendous bounds, as if the thunderbolt had fallen near him and he hoped to get away from it. Cal stood still, mainly because no time was given him for doing anything else, but the cougar almost brushed his shoulder as it sprang by him."Ugh!" said Crooked Nose. "Pull Stick great brave by and by. Good!"

Flash after flash, almost incessantly, followed the tremulous glare of lightning, and peal on peal followed the thunder, during a full minute, before any rain fell. Then it seemed to Cal as if one awful flash went through everything around him, bringing its rattling volume of deafening thunder with it. He was half-blinded, half-stunned, for a moment.

"That flash must have struck close by," he exclaimed.

So it had, for the next gleam showed him the gigantic trunk of the withered tree splintered through near the earth, its whitened stem, with its drapery of vines, toppling over to come down with a great crash upon the mound above which it so long had stood sentinel.

The next instant all was densely dark, for the rain came down in sheets, and all other sounds except that of the thunder were drowned in the roar of a great wind. Cal Evans had come into that forest to witness a hurricane.