"I've got a better scheme than digging," put in Charlie, his eyes gleaming. "Hitch up the cattle to the posts an' pull 'em out." "Good!" shouted Schoverling. "We're behind the times on thoughts, Doctor! Gholab, inspan the cattle over by those posts." Ten minutes later the oxen were standing ready, while the explorer and the boys made the ox-chains fast to one of the heavy posts. Slowly the oxen forged ahead, but to their dismay the post broke off short. "That's a pretty good sign that the earth is unmoved," declared Schoverling cheerfully. "Now for the other one." Once more the oxen were inspanned to the other post, and walked off at the yells of the Indians. This time a shout went up from all, for the huge post had been ripped out of the earth bodily, leaving a cavity exposed. Charlie leaped down at once, feeling around. "More logs down here," he cried. "We'll have to throw out the dirt after all." Instantly Jack was at his side, with two of the broad-bladed Masai knives. There was but room for one to work, but with Jack above and Charlie below the dirt began to fly at a great rate. The two boys were soon plastered with sandy mud. Then came a shout from Charlie, who was buried to his eyes. "Catch hold, up there!" Something rose above the ground, and Schoverling and Jack caught it, while the doctor peered down. No sooner had the explorer caught the long object than he gave a cry. "Those aren't logs, Chuck! They're tusks--wrapped up for carriage!" A moment later the hole had been enlarged in the sandy soil enough to let Jack leap down to his chum's aid. One by one the tusks were passed back to the Indians and Masai, who grouped them in a pile with much wondering chatter. "Reg'lar cave down here," came the muffled voice of Jack. "All ready?" "All ready," and more tusks came up. A moment later the dirt-smeared, excited face of Charlie appeared, and he clambered out, followed after by the figure of Jack. "That's all, General. Hurray!" "All!" echoed Schoverling. "Sure there's nothing else? Here, let me get down there." For the first time Charlie remembered the gold-dust. But although the explorer poked around in the cave-like hole beneath with one of the Masai knives, he finally had to climb up with the admission that the boys had been right. There was no gold-dust. For a few moments they stood around the huge pile of tusks, while von Hofe counted them. All were wrapped securely in canvas, mouldy and rotted away with the damp of the ground. Charlie tore at one and it came loose in his fingers. "Thirty-two," announced the big German excitedly. "They vas all goot, but none fery large, too. Ach, vat a pile of ifory!" "I'm sorry there was no gold-dust, though," said Schoverling. "Funny Mowbray mentioned it. Prob'ly he took it for granted that it was down there with the tusks. You don't suppose there could be a cache under that other post, do you?"