"We've got t' do it!" Young exclaimed, as we paused at last, without having loosened the plate in the least degree. "There's some way o' workin' this thing, I know. It must be some sort of a door, an' if we only can get th' hang of it we'll be all right. Have you got your wind again, Professor? Let's try 'f we can't sort o' prize this plate out; it's a little loose. Just get your fingers under it an' we'll sort o' pull it up an' out at th' same time. So! Now sling your muscle into it. Heft!"

We were stooping a little, and so had a strong purchase, and with all our united strength we heaved away together. There was a rattling of metal, a yielding of the plate so easy that our tremendous effort was out of all proportion to it; my fingers seemed suddenly to be nipped in a red-hot vice; Young uttered a yell of pain, and then we both were sprawling on our backs on the floor, while in front of us was a broad opening in the wall where a wide section of the panelling had risen upward (the plates sliding up under each other), and so had made an open way.

"H—ll! how that did hurt!" Young mumbled, with his nipped fingers in his mouth; and I must say that the vigor of his language was not uncalled for, as I well understood by the pain that I myself was suffering. I never remember pinching my fingers so badly as I did then in the whole course of my life.

However, we did not suffer our hurts, which were not really serious, to delay us in exploring this hidden place that so suddenly and with such unnecessary violence had opened to us. Pushing upward the ingeniously contrived door from the bottom, we easily raised it until an opening was discovered the full height of a man; and through this we went into a narrow passage in the rock that in a moment turned and so brought us into a room that was nearly as large as the oratory that we had just left, and that, as we presently found, actually communicated with the oratory by means of two narrow slits high up in the wall; which apertures here were plainly visible, but on the other side were so cleverly disguised by an ingenious arrangement of the overlapping plates as to be entirely concealed. Like the oratory, too, this room had an opening in its roof through which air entered, and so much light that we could see about us plainly. And the very first glance that I cast around me in this strange place assured me that, by sheer accident, we had found our way at last to the secret chamber wherein King Chaltzantzin's treasure had lain hidden for a thousand years.

Rude shelves had been cut in the rock on all four sides of the room, and on these were ranged earthen pots of curious shapes, ornamented with strange devices that my newly acquired knowledge enabled me to recognize—to express the matter in the terms of our system of heraldry—as the arms of a king quartered with the arms of certain princely houses or tribes. On these shelves, also, were many quaintly wrought vessels and some small square boxes, all of which were of gold—together with a score or so of small idols moulded in clay or roughly carved in stone, in which last the workmanship was so far inferior to that of the earthen-ware pots and golden vessels as to show at a glance that they were the product of a much earlier and ruder age; but belonging to the same age as the gold-work, or to a period even later, was a very beautiful Calendar Stone most delicately carved in obsidian, that was identical, save in the matter of size, with the great Calendar Stone that now is preserved in Mexico in the National Museum. This was placed at one end of the room upon a carved pedestal; and at the opposite end of the room, the end farthest removed from the entrance, was a great stone image of the god Chac Mool. Lying upon the Calendar Stone was what at first I took to be a cross-bow made of gold; but more careful examination convinced me, especially in view of the place where I had found it, that this certainly was an arbalest—called also a Jacob's staff and a cross-staff—such as in no very ancient times, until the invention of the quadrant, was used by Europeans in taking the meridional altitude of the sun and stars.

At the moment that I made this last most curious and exceedingly interesting discovery, Young, who had been investigating on his own account, gave a yell of delight, and bounded towards me flourishing his own brace of revolvers in his hands. "They're all here!" he cried. "All our guns are here, an' th 'ca'tridges too! Now we have got the bulge on these devils for sure!"

As he spoke I also was thrilled with joy at the thought of the vengeance which this recovery of our arms might enable us to take upon Fray Antonio's murderers; but my joy was only momentary, for I could not but reflect that, after all, these Aztlanecas had but acted in accordance with their lights—excepting only the Priest Captain, for whom the most cruel death would be all too merciful—and that our slaying them would not be vengeance, but mere brutal revenge. Having which thoughts in mind, I answered, "At least we can shoot ourselves with them, and so be safe from death by sacrifice."

"Not much we won't shoot ourselves," Young replied, with great energy; "an' nobody's goin' t' come monkeyin' 'round us with sacrifices, either. Why, man alive, we ain't goin' t' stay here—not by a jugful! We're goin' t' light right out o' this an' be smack off for home."

"How?" I asked, blankly, and with real alarm; for the hot hope that had filled me at the thought of our having found a way of escape had vanished as I perceived that from this chamber there was no outlet save the hole in the roof; which hole also accounted for the current of air whereby my hope had been inspired. Therefore, when Young spoke in this extravagant fashion, the dread came over me that he was going mad.

"How?" he answered, "why, through that Jack Mullins, of course. He is th' tippin' kind. I was just tryin' him, while you was pokin' 'round in that old rubbish, when I happened t' ketch sight of our guns; an' seein' them, you bet, made me bounce. Here goes for another shot at him! Stick somethin' under him t' keep him up when I heave."