When my father was in Mexico City he saw the stone where they used to sacrifice their prisoners."

As we dropped down by the fire again some one asked whether the Mound-Builders were older than the Aztecs. When we once got upon the Mound-Builders we never willingly got away from them, and we were still conjecturing when we heard a loud splash in the water.

"Must have been a big cat jumping," said Fritz. "They do some-times. They must see bugs in the dark. Look what a track the moon makes!"

There was a long, silvery streak on the water, and where the current fretted over a big log it boiled up like gold pieces.

"Suppose there ever was any gold hid away in this old river?" Fritz asked. He lay like a little brown Indian, close to the fire, his chin on his hand and his bare feet in the air. His brother laughed at him, but Arthur took his suggestion seriously.

"Some of the Spaniards thought there was gold up here somewhere. Seven cities chuck full of gold, they had it, and Coronado and his men came up to hunt it. The Spaniards were all over this country once."

Percy looked interested. "Was that before the Mormons went through?"

We all laughed at this.

"Long enough before. Before the Pilgrim Fathers, Perce. Maybe they came along this very river. They always followed the watercourses."

"I wonder where this river really does begin?" Tip mused. That was an old and a favorite mystery which the map did not clearly explain. On the map the little black line stopped somewhere in western Kansas; but since rivers generally rose in mountains, it was only reasonable to sup-pose that ours came from the Rockies. Its destination, we knew, was the Missouri, and the Hassler boys always maintained that we could embark at Sandtown in floodtime, follow our noses, and eventually arrive at New Orleans. Now they took up their old argument. "If us boys had grit enough to try it, it wouldn't take no time to get to Kansas City and St. Joe."

We began to talk about the places we wanted to go to. The Hassler boys wanted to see the stockyards in Kansas City, and Percy wanted to see a big store in Chicago. Arthur was interlocutor and did not betray himself.

"Now it's your turn, Tip."

Tip rolled over on his elbow and poked the fire, and his eyes looked shyly out of his queer, tight little face. "My place is awful far away. My Uncle Bill told me about it."

Tip's Uncle Bill was a wanderer, bitten with mining fever, who had drifted into Sandtown with a broken arm, and when it was well had drifted out again.

"Where is it?"

"Aw, it's down in New Mexico somewheres. There aren't no rail-roads or anything. You have to go on mules, and you run out of water before you get there and have to drink canned tomatoes."

"Well, go on, kid. What's it like when you do get there?"

Tip sat up and excitedly began his story.

"There's a big red rock there that goes right up out of the sand for about nine hundred feet. The country's flat all around it, and this here rock goes up all by itself, like a monument. They call it the Enchanted Bluff down there, because no white man has ever been on top if it. The sides are smooth rock, and straight up, like a wall. The Indians say that hundreds of years ago, before the Spaniards came, there was a village away up there in the air.