In the centre of the square, in the midst of smooth lawns and flower-beds of every conceivable shape and colour, and groves of flowering trees, stood a great domed building, which they approached through an avenue of overarching trees interlaced with flowering creepers.

The car stopped at the foot of a triple flight of stairs of dazzling whiteness which led up to a broad arched doorway. Several groups of people were sprinkled about the avenue and steps and the wide terrace which ran along the front of the building. They looked with keen, but perfectly well-mannered surprise at their strange visitors, and seemed to be discussing their appearance; but not a step was taken towards them, nor was there the slightest sign of anything like vulgar curiosity.

"What perfect manners these dear people have!" said Zaidie, as they dismounted at the foot of the staircase. "I wonder what would happen if a couple of them were to be landed from a motor-car in front of the Capitol at Washington. I suppose this is their Capitol, and we've been brought here to be put through our facings. What a pity we can't talk to them! I wonder if they'd believe our story if we could tell it."

"I've no doubt they know something of it already," replied Redgrave; "they're evidently people of immense intelligence. Intellectually, I daresay, we're mere children compared with them, and it's quite possible that they have developed senses which we have no idea of."

"And perhaps," added Zaidie, "all the time that we are talking to each other our friend here is quietly reading everything that is going on in our minds."

Whether this was so or not their host gave no sign of comprehension. He led them up the steps and through the great doorway, where he was met by three splendidly dressed men even taller than himself.

"I feel beastly shabby among all these gorgeously attired personages," said Redgrave, looking down at his plain tweed suit, as they were conducted with every manifestation of politeness along the magnificent vestibule into which the door opened.

"And I'm sure I am quite a dowdy in comparison with these lovely creatures," added Zaidie, "although this dress was made in Paris. Lenox, if things are for sale here you'll have to buy me one of those costumes, and we'll take it back and get one made like it. I wonder what they'd think of me dressed in one of those costumes at a ball at the Waldorf-Astoria."

Before he could make a suitable reply, a door at the end of the vestibule opened and they were ushered into a large hall which was evidently a council-chamber. At the further end of it were three semi-circular rows of seats made of a polished silvery metal, and in the centre and raised slightly above them another under a canopy of sky-blue silk. This seat and six others were occupied by men of most venerable aspect, in spite of the fact their hair was just as long and thick and glossy as their host's or even as Zaidie's own.

The ceremony of introduction was exceedingly simple. Though they could not, of course, understand a word he said, it was evident from his eloquent gestures that their host described the way in which they had come from Space and landed on the surface of the World of the Crystal Cities, as Zaidie subsequently re-christened Ganymede.