In the morning they rode up for a look along the ledge, found that it would answer their requirements and then went southeast, curving further into the desert, and it was not long before Red's roving glance caught something which aroused his interest and he silently rode off to investigate, his companion going slowly ahead. When he returned it was by another way and he rode with his eager eyes searching the desert beneath and ahead of him. Reaching his friend, who had stopped and also was scanning the desert floor with great intentness, he nodded in quiet satisfaction.
"Think you see 'em, too?" he smilingly inquired. "They're so faint they can't hardly be seen, not till you look ahead, an' then it's only th' difference between this strip of sand that we're on an' th' rest of th' desert. It's a cattle trail, Hoppy; I just found another water-hole, a big one. Th' bank was crowded with hoof marks, cattle an' cayuses. Looks like they come from th' west, bearin' a little north. Th' only reason we didn't see 'em when we rode down was because they was on hard ground. That shore explains th' dead cow."
"An' in a few hours more," said his companion, "this powdery dust will blot 'em out. If they was clearer I'd risk follerin' them, even if we only had a canteen apiece. We can ride as far between waters as they can drive a herd, an' a whole lot farther. It's only fearin' that th' trail will disappear that holds me back."
"We don't have to risk it yet," said Red, grimly. "We've found out where they cut in an' how they start across; an' all we got to do is to lay low up there an' wait for 'em to come back, or start another herd across, to learn who they are."
"If we wait for their next drive we can foller 'em on a fresh, plain trail, an' be a lot better prepared," supplemented Hopalong. "I reckon we're shore goin' to fatten our comeback!"
"It's pickin' up fast," gloated his friend. "All we got to do is watch that big water-hole an' we got 'em. There ain't so many water-holes out on this skillet that they can drive any way they like. We'll camp at th' little one, of course, but we can lay closer to th' big one nights."
"An' from th' ridge up yonder th' man on day watch can see for miles."
"Yes; an' fry, an' broil, an' sizzle, an' melt!" muttered Red. "D—n 'em!"
Hopalong had wheeled and was leading the way into the southwest as straight as he could go for the meeting with Johnny, and Red pushed up past him and bore a little more to the west. They had seen all they needed to see for the day, and they had made up their minds.
At last after a long, hot ride they reached the bluffs marking the side of the plateau and soon were winding down a steep-walled arroyo which led to the plain below, and the country began to change with such insensible gradations that they hardly noticed it. Sage and greasewood became more plentiful and after an hour had passed an occasional low bush was to be seen and the ground sloped more and more in front of them. A low fringe of greenery lay along the distant bottom, where Sand Creek or some other hidden stream came close to the top of the soil, later to issue forth and become the stream into which the Question-Mark's creek later emptied. They crossed this and breasted an opposing slope, followed around the base of a low ridge of hills and at last stopped under a clump of live-oak and cotton woods in the extreme east end of the Question-Mark valley.