"To a limited extent. I have been able to watch you ever since your coming. You did not know about Harry, but I saw him come--in the arms of the Nervina."

The Nervina nodded.

"It is so. I knew the Senestro. I was afraid that Harry would fall into his hands. I had previously endeavoured to have him give the jewel to Charlotte Fenton. I didn't trust the great Bar--"

Harry interrupted, "Only because of her distrust of the Senestro did she decide to come through the Blind Spot with me. She knew what to do. As soon as we got here, she bundled me off, privately nursed me back to health if not strength, and when the time came rushed me up here at the last second to be in at the finish."

Watson thought of the dog, Queen. She also had come through just in time to save his life. Did Harry know anything about her? When Wendel had related what he knew, Chick commented:

"It's almighty strange, Harry. Everything works out to fit in exactly with that confounded Prophecy. Perhaps that accounts for your affinity for the Nervina; it is something beyond your control, or hers. We'll have to wait and see."

There was not long to wait. The days passed. The palace was full of Rhamdas, summoned by Dr. Holcomb, who, as the Jarados himself, was now issuing orders concerning the great day, the last of the sixteen days, now very close at hand; the day which the Rhamdas constantly alluded to as "the Day of Judgment."

The Senestro went unmolested. Returning to the Mahovisal, he worked now to further the truths of the Prophecy.

Still the millions continued to descend upon the Mahovisal. Coming from the furthermost parts of the Thomahlia, the pilgrims' aircraft kept the air above the city constantly alive. There were days such as no man had ever known. Even the Rhamdas, trained to composure, gave evidence of the strain. The atmosphere was tense, charged with expectancy and hope. A whole world was coming to what it conceived as its judgment, and its end. And--the Spot of Life was the Blind Spot!

At last the doctor summoned the two young men. It was night, and the June Bug was waiting. This time the Geos himself was at the controls.

"We are going to the Mahovisal," spoke the doctor--"to the Temple of the Bell and Leaf. There is still something I must know before the Judgment." He was speaking English. "If we can bring the Prophecy to pass just so far, and no farther, we shall be able to extricate ourselves nicely. Anyway, I think we shall not return to the Palace of Light."

He held a black leather case in his hand. He touched it with a finger.

"If this little case and its contents get through the Blind Spot it will advance civilisation--our civilisation--about a thousand-fold. So remember: Whatever happens to me, be sure and remember this case! It must go through the Spot!"

He said no more, but took his seat beside the Geos. The young men took the rear seats. In a short time they had crossed the great range of mountains and were hovering over the Mahovisal.

There was no sound. Though the city was packed with untold millions, the tension was such that scarcely a murmur came out of the metropolis. The air was magnetic, charged, strained close to the breaking point; above all, the reverence for the Last Day, and the hope, rising, accumulating, to the final supreme moment.

For the Sixteenth Day was now only forty-eight hours removed.

Both Chick and Harry realised that their lives were at stake; the doctor had made that clear. In the last minute, in the final crisis, they must crowd their way through the Blind Spot. Only the professor knew how it was to be done.

At the temple they found the Nervina and the Aradna waiting. The Jan Lucar was with them. The Geos had secured entrance by a side door. From it they could look out, themselves unobserved, over the entire building and upon the Spot of Life. The place was packed--thousands upon thousands of people, standing in silent awe and worship, one and all gazing toward the all-important Spot. There was no sound save the whisper of multitudinous breathing.

Said Harry to Chick:

"I see Queen up there!"

Harry circled the group, and bounded up the great stairs. In a moment he was patting his dog's head. She looked up and wagged her tail to show her pleasure. But she was not effusive. Somehow she wasn't just like his old shepherd. She glanced at him, and then out at the concourse below, and lolled her tongue expectantly. Then she settled back into her place and resumed watch--exactly as any of her kind would have held guard over a band of sheep.

The dog was serious. Afterward, Wendel said he had a dim notion that she was no longer a dog at all, but a mere instrument in the hand of Fate.

"What's the matter, old girl?" he asked. "Don't you like 'em?"

For answer she gave a low whine. She looked up again, and out into the throng; she repeated the whine, with a little whimper at the end.

Harry returned to the others. Nothing was said of what he had done. At once the Geos led the group through a small, half-hidden door, beyond which was a narrow, winding stairway of chocolate-coloured stone. The Geos halted.

"Dost wish the building emptied, O Jarados?"

"I do. When we come back from under the Spot of Life, we should have the place to ourselves."

Accompanied by the two queens the Rhamda returned to the main body of the temple. Dr. Holcomb, Harry and Chick were left to themselves.

The professor took out a notebook. In it was traced a map, or chart, together with several notations.

"The three of us," said he, "are going to take a look at the under side of the Blind Spot. This stairway leads into a secret chamber inside the foundations of the great stair; and according to this data I found in the palace, together with some calculations of my own, we ought to find some of the secrets of the Spot."

He led the way up the steps. At the top of the flight they came to a blank, blue wall. There was no sign of a door, but in the front of the wall stood a low platform, in the centre of which was set a strange, red stone. The professor consulted his chart, then opened his black case.

From it he took another stone, red like the other, but not so intense.

This he touched to the first, and waited.

Inside a minute a light sprang up from the contact. Immediately Harry and Chick beheld something they had not seen on the wall--a knob, or button. The doctor pulled sharply on it. Instantly a door opened in the wall.

They passed into another room. It was not a large place--about thirty feet across, perhaps, stone-walled and with a low ceiling. From all sides a soft, intrinsic glow was given off. There were no furnishings.

But in the centre of the ceiling, occupying almost all the space overhead, a snow-white substance hung as if suspended. Were it not for its colour and its size, it might have been likened to an immense, horizontal grindstone hung in mid-air, with apparently nothing to hold it there. Around its side they could make out a narrow gap between it and the ceiling. And directly along its lower edge was a series of small, fiery jewels inset, and of the order and colour of the sign of the Jarados--red, blue and green, alternating.

The professor produced an electric torch and held it up to show that the gap between the stone and the ceiling was unbroken at any point. Then he counted the jewels on the lower edge. Chick made out twenty-four. Three were missing from their sockets--all told, then, there should have been twenty-seven.

The doctor noted the positions of the three empty sockets and, drawing a tapeline from his pocket, proceeded to measure the distances from each of the three--they were widely separated round the circle--from each other. Then he turned to Chick and Harry.

"Do you know where we are?"

"Under the Spot of Life," it was easy to answer.

"You are in San Francisco!"

"Not in--in--" Chick hesitated.

"Yes. Exactly. This is 288 Chatterton Place--the house of the Blind Spot." He paused for them to digest this. Then, "Harry--did you say Hobart Fenton was with you on that last night?"

"Hobart and his sister, Charlotte. I remember their coming at the last minute. They were too late, sir."

The professor nodded.

"Well, Harry, the chances are that Hobart is not more than twenty feet away at the present moment. Charlotte may be sitting right there"--pointing to a spot at Harry's side--"this very instant. And there may be many others.

"No doubt they are working hard to solve the mystery. Unfortunately the best they can do is to guess. We hold the key. That is--I should correct that statement--we hold the knowledge, and they hold the keys."

"The keys?" Harry wanted to know more.

The professor pointed to the three empty sockets in the great white stone above their heads. "These three missing stones are the keys.

Until they are reset we cannot control the Spot. I had found two of them before I came through. I take it that both of you remember the blue one?"

"I think," agreed Chick, "that neither of us is ever likely to forget it! Eh, Harry?"