The wall of the canyon near the tree, so far as their eyes could judge, was a solid mass of cracked and seamed rocks, that sprang from the bottom of the canyon almost straight upward for five hundred or more feet. There did not appear to be break or opening of any kind, nor did it look as if there ever had been such an opening. For half an hour the two boys and Rex and Dill and Mr. Dickson searched excitedly up and down the wall of the canyon near the tree, without one of them finding the first sign of an entrance to the hidden gulch. "Great Moses, but this is exasperating!" complained Thure, staring indignantly at the blank walls of rock. "To be held up like this, when almost at the entrance to the Cave of Gold! But we have got to find it," and the heat of his excitement having cooled down a little, he began a more careful and systematic search of the face of the wall of rock. "Found it?" yelled Ham, who at this moment came round the turn in the canyon at the head of the remainder of the company. "No," Dickson called back. "Not a sign of an opening anywhere in sight." "I reckon this is where our trouble begins," Ham declared a few minutes later, when he stood near the Big Tree and searched the precipitous side of the wall of rock vainly with his keen eyes. "It shore don't look as if there ever had ben any gulch entrance thar." "Let us have another look at the map," suggested Mr. Conroyal, after all had searched the face of the wall of rock in vain for some time. "Possibly we have overlooked some little point of guidance on it." Thure at once procured the map and handed it to his father; and all crowded anxiously around him, as he seated himself on a rock and spread the map out on his knees. "This sure must be the right place," he declared, as he glanced down at the map and then up and down the canyon; "for here is the Big Tree and there," and he pointed to the white pillar, "is Lot's Wife, and that slide down there must surely have been the Devil's Slide; and, if this is the right place, then the entrance to Crooked Arm Gulch must be right there, according to this map," and he pointed to the wall of rock against which the great limbs of the tree were pressing. "Wai, it ain't thar," and Ham turned away disgustedly from the map. "Any fool with eyes in his head can see that it ain't thar. I reckon we've come on a wild-goose chase. Let's go intew camp an' git some grub down us. I'm allfired hungry, an' it's tew late tew look any more tew-day," and he glanced toward the west wall of the canyon, up the side of which the shadows of night were already beginning to creep. "Possibly we can dew better in th' mornin', though it's more'n I can see how, seem' that thar's nuthin' but th' face of a solid wall of rock tew search; an' we've searched 'bout every inch of that that we can a'ready," and he threw his big frame down on the ground and stared at the wall of rock wrathfully.