That gentleman shook his head. "This claim shall henceforth be known as The Golden Promise," he said.

Next on the afternoon's programme was the erection of the tent, and Jack at once volunteered to search the scrub for the two forked upright posts required to support the ridge or roof pole of the calico structure, Mackay and Bob meanwhile arranging the various stores and mining implements which they had unloaded from the camel. That wiry animal itself was not far off assiduously chewing clumps of saltbush and spinifex grass, varying this somewhat monotonous fare by occasional mouthfuls of the mulga twigs within its reach. Five minutes, ten minutes passed, and no Jack reappeared, nor was the sound of his axe heard in the near distance. Mackay became uneasy.

"I do hope the laddie hasna gone far," he muttered, throwing down the pick handle he was fitting to the steel and looking around anxiously.

"But he'll know how to get back," reassured Bob.

Mackay grunted unbelievingly. "That's aye the way wi' new chums in the bush," he declared. "They never remember that everything is alike in this country, an' that only the sun can be taken as a guide." Seizing his rifle he set off in the direction Jack had taken, Bob hastening at his heels; but they had not gone far before they were gazing at a most extraordinary spectacle. There was the delinquent indulging in fierce chase after a great yellow ungainly creature which scrambled around in a narrow circle, turning at intervals to snap savagely at its tormentor, who was aiming numerous but ineffective blows at his quarry with the axe he carried. Round and round they went, and Jack's energy seemed all but spent when Mackay's hearty laugh attracted his attention.

"Ho! ho! ho!" he chuckled, walking leisurely forward and interrupting the performance. Bob at the moment could not see any reason for this display of humour, and certainly Jack did not.

"It attacked me when I was cutting a tree," explained the baffled warrior, "and every time I stopped chasing it, it turned and chased me. I suppose the brute's tired now, or it would be at me again." He wiped the perspiration from his forehead, and eyed his enemy malevolently. The object of his wrath was a peculiar crocodile-like creature with an enormously long tail, short thick-set legs, and a narrow venomous-looking head. It must have measured fully five feet in length, and was certainly ugly enough to disconcert any one who did not know the nature of the beast. Now it rested calmly by the foot of a tree, its head swaying gently and its abnormally elongated tongue shooting out and in with lightning rapidity.

"It's only a poor wee iguana, Jack," consoled Mackay. "It would dae you no harm, though I will admit it doesna look as peaceably inclined as it might; but watch me whistle to it." He strode forward, and kneeling beside the huge iguana—but as the boys noticed, beyond the reach of its sturdy claws—whistled unmelodiously a selection from a popular opera, and lo! ere the first two bars had been negotiated, Jack's recent enemy's head began to nod rhythmically with the music! and its whole body took on an attitude of satisfied repose.

"Well, I'm jiggered!" was all that Jack could say, while Bob exploded into uncontrollable mirth. Then the musician ceased his labours.

"I'm no sayin' that anybody could charm the beastie like me," he admitted with exceeding modesty. "My whustle's got a wonderfu' movin' element in it——"