In place of the indulgent smile for which he was playing, Waldo received a frown, and directly thereafter the professor spoke in tones which could by no possibility be mistaken.
"Come with me, both of you. I am going back to the aerostat, and I dare not leave you boys behind. Come!"Kind of heart and generally complaisant though uncle Phaeton was, neither Bruno nor Waldo cared to cross his will when made known in such tones, and without further remonstrance they followed his lead, slipping away from the snug little observatory without drawing attention to themselves from any of yonder busy horde.
Not until the trio was fairly within the gulch did the professor speak again, and then but a brief sentence or two.
"Give me time to weigh the matter, lads. Possibly I may agree, but don't try to hurry my cooler judgment, please."Waldo gave his brother an eager nudge at this, gestures and grimaces being made to supply the lack of words. But when, the better to express his confidence that all was coming their way, the youngster attempted a caper of delight, his foot slipped from a leaf-hidden stone, and he took an awkward tumble at full length.
"Never touched me!" he cried, scrambling to his feet ere a hand could come to his aid. "Who says I don't know how to stand on both ends at the same time?"Barring this little caper, naught took place on their way to the air-ship; and once there, the professor heaved a mighty sigh, wiping his heated face as one might who has just won a worthy race. But he betrayed no especial haste in setting the flying-machine afloat and Waldo finally ventured:
"Can we help you off, uncle Phaeton?"
But he was assured there existed no necessity for such great haste.
"In fact, it might be dangerous to start while so many of the Aztecs are upon the lookout," came the unexpected addition. "Ibelieve it would be vastly better not to leave here until shortly before dawn, to-morrow."It took but a few words further to convince the brothers that this idea was wisest, and while the young fellows felt sorry to have their view cut so short, neither ventured to actually rebel.
After all, the day was well-nigh spent, and, besides preparing their evening meal, it was essential that their plans for the immediate future should be shaped as thoroughly as possible.
Professor Featherwit had resolved to fetch Cooper Edgecombe to the scene of interest, in order to give him at least a fair chance to solve the enigma which was perplexing them all. Even so, he felt that no small degree of physical danger would attend that presence, particularly if it should really prove, as they could but suspect, that both wife and daughter of the involuntary exile were yonder, among the Aztecans.
Much of this the professor made known to his nephews during that evening, the trio thoroughly discussing the matter in all its bearings, but before the air-ship was prepared for the night's rest, uncle Phaeton made the youngsters happy by consenting to their remaining behind as guardians to the Lost City, while he went in quest of the balloonist.
"But bear ever in mind the conditions, lads," was his earnest conclusion. "I place you upon your honour to take all possible precautions against being discovered, or even running the least unnecessary risk during my absence.""Don't let that bother you, uncle Phaeton," Waldo hastened to give assurance. "We'll be wise as pigeons, and cautious as any old snake you ever caught up a tree; eh, Bruno, old man?""We promise all you ask, uncle, but does that mean we must stay right here, without even stealing a weenty peep at the Lost City?"Professor Featherwit felt sorely tempted to say yes, but then, knowing boyish nature (although Bruno had just passed his majority, while Waldo was "turned seventeen") so well, he feared to draw the reins too tightly lest they give way entirely.
"No; I do not expect quite that much, my lads; but I do count on your taking no unnecessary risks, and in case of discovery that you rather trust to flight, and my finding you later on, than to actually fighting."So it was decided, and at a fairly early hour the trio lay down to sleep. Although so unusually excited by the marvellous discoveries of the day just spent, their open-air life tended to calm their brains, and, far sooner than might have been expected, sleep crept over them, one and all, lasting until nearly dawn.
Perhaps it was just as well that the wakening was not more early, for the professor was beginning to regret his weakness of the past evening, and had there been more time for drawing lugubrious pictures of probable mishaps, he might even yet have insisted on taking the youngsters with him.
Knowing that it was rather more than probable some of the Indians would be stationed upon the hills to watch for the queerly shaped air-demon, the professor felt obliged to lose no further time, and so the separation was effected, just as the eastern sky was beginning to show streaks and veins of a new day.