"Oh I'm at the station, Doctor-Gary Station. I just got in."

"Then grab a cab and come here at once."

"Uh, I don't want to put you to any trouble, Doctor. I called because mother said to say goodbye to you." Privately he had hoped that Dr. Jefferson would be too busy to waste time on him. Much as he disapproved of cities he did not want to spend his last night on Earth exchanging politeness with a family friend; he wanted to stir around and find out just what the modern Babylon did have to offer in the way of diversion. His letter-of-credit was burning a hole in his pocket; he wanted to bleed it a bit.

"No trouble. See you in a few minutes. Meanwhile I'll pick out a fatted calf and butcher it. By the way, did you receive a package from me?" The doctor looked suddenly intent.

"A package? No."

Dr. Jefferson muttered something about the mail service. Don said, "Maybe it will catch up with me. Was it important?"

"Uh, never mind; we'll speak of it later. You left a forwarding address?"

"Yes, sir-the Caravansary."

"Well-whip up the horses and see how quickly you can get here. Open sky"

"And safe grounding, sir." They both switched off. Don left the booth and looked around for a cab stand. The station seemed more jammed than ever, with uniforms much in evidence, not only those of pilots and other ship personnel but military uniforms of many corps-and always the ubiquitous security police. Don fought his way through the crowd, down a ramp, along a slidewalk tunnel, and finally found what he wanted. There was a queue waiting for cabs; he joined it.

Beside the queue was sprawled the big, ungainly saurian form of a Venerian "dragon." When Don progressed in line until he was beside it, he politely whistled a greeting.

The dragon swiveled one fluttering eyestalk in his direction. Strapped to the "chest" of the creature, between its forelegs and immediately below and in reach of its handling tendrils, was a small box, a voder. The tendrils writhed over the keys and the Venerian answered him, via mechanical voder speech, rather than by whistling in his own language. "Greetings to you also, young sir. It is pleasant indeed, among strangers, to hear the sounds one heard in the egg." Don noted with delight that the outlander had a distinctly Cockney accent in the use of his machine.

He whistled his thanks and a hope that the dragon might die pleasantly.

The Venerian thanked him, again with the voder, and added, "Charming as is your accent, will you do me the favor of using your own speech that I may practice it?"

Don suspected that his modulation was so atrocious that the Venerian could hardly understand it; he lapsed at once into human words. "My name is Don Harvey," he replied and whistled once more-but just to give his own Venerian name, "Mist on the Waters"; it had been selected by his mother and he saw nothing funny about it.

Nor did the dragon. He whistled for the first time, naming himself, and added via voder, "I am called `Sir Isaac Newton.' " Don understood that the Venerian, in so tagging himself, was following the common dragon custom of borrowing as a name of convenience the name of some earthhuman admired by the borrower.

Don wanted to ask "Sir Isaac Newton" if by chance he knew Don's mother's family, but the queue was moving up and the dragon was lying still; he was forced to move along to keep from losing his place in line. The Venerian followed him with one oscillating eye and whistled that he hoped that Don, too, might die pleasantly.

There was an interruption in the flow of autocabs to the stand; a manoperated flatbed truck drew up and let down a ramp. The dragon reared up on six sturdy legs and climbed aboard. Don whistled a farewell-and became suddenly and unpleasantly aware that a security policeman was giving him undivided attention. He was glad to crawl into his autocab and close the cover.

He dialed the address and settled back. The little car lurched forward, climbed a ramp, threaded through a freight tunnel, and mounted an elevator. At first Don tried to keep track of where it was taking him but the tortured convolutions of the ant hill called "New Chicago" would have made a topologist dyspeptic; he gave up. The robot cab seemed to know where it was going and, no doubt, the master machine from which it received its signals knew. Don spent the rest of the trip fretting over the fact that his ticket had not yet been turned over to him, over the unwelcome attention of the security policeman, and, finally, about the package from Dr. Jefferson. The last did not worry him; it simply annoyed him to have mail go astray. He hoped that Mr. Reeves would realize that any mail not forwarded by this afternoon would have to follow him all the way to Mars.

Then he thought about "Sir Isaac." It was nice to run across somebody from home.

Dr. Jefferson's apartment turned out to be far underground in an expensive quarter of the city. Don almost failed to arrive; the cab had paused at the apartment door but when he tried to get out the door would not open. This reminded him that he must first pay the fare shown in the meter-only to discover that he had pulled the bumpkin trick of engaging a robot vehicle without having coins on him to feed the meter. He was sure that the little car, clever as it was, would not even deign to sniff at his letter-of-credit. He was expecting disconsolately to be carted by the machine off to the nearest police station when he was rescued by the appearance of Dr. Jefferson.

The doctor gave him coins to pay the shot and ushered him in. "Think nothing of it, my boy; it happens to me about once a week. The local desk sergeant keeps a drawer full of hard money just to buy me out of hock from our mechanical masters. I pay him off once a quarter, cumshaw additional. Sit down. Sherry?"

"Er, no, thank you, sir."

"Coffee, then. Cream and sugar at your elbow. What do you hear from your parents?"

"Why, the usual things. Both well and working hard and all that." Don looked around him as he spoke. The room was large, comfortable, even luxurious, although books spilling lavishly and untidily over shelves and tables and even chairs masked its true richness. What appeared to be a real fire burned in one corner. Through an open door he could see several more rooms. He made a high, and grossly inadequate, mental estimate of the cost of such an establishment in New Chicago.

Facing them was a view window which should have looked into the bowels of the city; instead it reflected a mountain stream and fir trees. A trout broke water as he watched.

"I'm sure they are working hard," his host answered. "They always do. Your father is attempting to seek out, in one short lifetime, secrets that have been piling up for millions of years. Impossible-but he makes a good stab at it. Son, do you realize that when your father started his career we hadn't even dreamed that the first system empire ever existed?" He added thoughtfully, "If it was the first." He went on, "Now we have felt out the ruins on the floor of two oceans-and tied them in with records from four other planets. Of course your father didn't do it all, or even most of it-but his work has been indispensable. Your father is a great man, Donald - and so is your mother. When I speak of either one I really mean the team. Help yourself to sandwiches."

Don said, "Thank you," and did so, thereby avoiding a direct answer. He was warmly pleased to hear his parents praised but it did not seem to be quite the thing to agree heartily.

But the doctor was capable of carrying on the conversation unassisted. "Of course we may never know all the answers. How was the noblest planet of them all, the home of empire, broken and dispersed into space junk? Your father spent four years in the Asteroid Belt-you were along, weren't you? - and never found a firm answer to that. Was it a paired planet, like Earth-Luna, and broken up by tidal strains? Or was it blown up?"