The gigantic robots moved slowly, with mechanical precision, through the doorway that cleared their heads by a scant foot, so that the two men had to duck hurriedly, along a narrow corridor in which their unhurried footsteps boomed monotonously and into the, air lock.

The long, airless tunnel that stretched to a pinpoint before them brought home forcefully to Powell the exact magnitude of the task accomplished by the First Expedition, with their crude robots and their start-from-scratch necessities. They might have been a failure, but their failure was a good deal better than the usual run of the System’s successes.

The robots plodded onward with a pace that never varied and with footsteps that never lengthened.

Powell said: “Notice that these tunnels are blazing with lights and that the temperature is Earth-normal. It’s probably been like this all the ten years that this place has remained empty.”

“How’s that?”

“Cheap energy; cheapest in the System. Sunpower, you know, and on Mercury’s Sunside, sunpower is something. That’s why the Station was built in the sunlight rather than in the shadow of a mountain. It’s really a huge energy converter. The heat is turned into electricity, light, mechanical work and what have you; so that energy is supplied and the Station is cooled in a simultaneous process.”

“Look,” said Donovan. “This is all very educational, but would you mind changing the subject? It so happens that this conversion of energy that you talk about is carried on by the photocell banks mainly – and that is a tender subject with me at the moment.”

Powell grunted vaguely, and when Donovan broke the resulting silence, it was to change the subject completely. “Listen, Greg. What the devil’s wrong with Speedy, anyway? I can’t understand it.”

It’s not easy to shrug shoulders in an insosuit, but Powell tried it. “I don’t know, Mike. You know he’s perfectly adapted to a Mercurian environment. Heat doesn’t mean anything to him and he’s built for the light gravity and the broken ground. He’s foolproof – or, at least, he should be.”

Silence fell. This time, silence that lasted.

“Master,” said the robot, “we are here.”

“Eh?” Powell snapped out of a semidrowse. “Well, get us out of here – out to the surface.”

They found themselves in a tiny substation, empty, airless, ruined. Donovan had inspected a jagged hole in the upper reaches of one of the walls by the light of his pocket flash.

“Meteorite, do you suppose?” he had asked.

Powell shrugged. “To hell with that. It doesn’t matter. Let’s get out.”

A towering cliff of a black, basaltic rock cut off the sunlight, and the deep night shadow of an airless world surrounded them. Before them, the shadow reached out and ended in knife-edge abruptness into an all-but-unbearable blaze of white light, that glittered from myriad crystals along a rocky ground.

“Space!” gasped Donovan. “It looks like snow.” And it did.

Powell’s eyes swept the jagged glitter of Mercury to the horizon and winced at the gorgeous brilliance.

“This must be an unusual area,” he said. “The general albedo of Mercury is low and most of the soil is gray pumice. Something like the Moon, you know. Beautiful, isn’t it?”

He was thankful for the light filters in their visiplates. Beautiful or not, a look at the sunlight through straight glass would have blinded them inside of half a minute.

Donovan was looking at the spring thermometer on his wrist. “Holy smokes, the temperature is eighty centigrade!”

Powell checked his own and said: “Um-m-m. A little high. Atmosphere, you know.”

“On Mercury? Are you nuts?”

“Mercury isn’t really airless,” explained Powell, in absentminded fashion. He was adjusting the binocular attachments to his visiplate, and the bloated fingers of the insosuit were clumsy at it. “There is a thin exhalation that clings to its surface – vapors of the more volatile elements and compounds that are heavy enough for Mercurian gravity to retain. You know: selenium, iodine, mercury, gallium, potassium, bismuth, volatile oxides. The vapors sweep into the shadows and condense, giving up heat. It’s a sort of gigantic still. In fact, if you use your flash, you’ll probably find that the side of the cliff is covered with, say, hoar-sulphur, or maybe quicksilver dew.

“It doesn’t matter, though. Our suits can stand a measly eighty indefinitely.”

Powell had adjusted the binocular attachments, so that he seemed as eye-stalked as a snail.

Donovan watched tensely. “See anything?”

The other did not answer immediately, and when he did, his voice was anxious and thoughtful. “There’s a dark spot on the horizon that might be the selenium pool. It’s in the right place. But I don’t see Speedy.”

Powell clambered upward in an instinctive striving for better view, till he was standing in unsteady fashion upon his robot’s shoulders. Legs straddled wide, eyes straining, he said: “I think… I think – Yes, it’s definitely he. He’s coming this way.”

Donovan followed the pointing finger. He had no binoculars, but there was a tiny moving dot, black against the blazing brilliance of the crystalline ground.

“I see him,” he yelled. “Let’s get going!”

Powell had hopped down into a sitting position on the robot again, and his suited hand slapped against the Gargantuan’s barrel chest. “Get going!”

“Giddy-ap,” yelled Donovan, and thumped his heels, spur fashion.

The robots started off, the regular thudding of their footsteps silent in the airlessness, for the nonmetallic fabric of the insosuits did not transmit sound. There was only a rhythmic vibration just below the border of actual hearing.

“Faster,” yelled Donovan. The rhythm did not change.

“No use,” cried Powell, in reply. “These junk heaps are only geared to one speed. Do you think they’re equipped with selective flexors?”

They had burst through the shadow, and the sunlight came down in a white-hot wash and poured liquidly about them.

Donovan ducked involuntarily. “Wow! Is it imagination or do I feel heat?”

“You’ll feel more presently,” was the grim reply. “Keep your eye on Speedy.”

Robot SPD 13 was near enough to be seen in detail now. His graceful, streamlined body threw out blazing highlights as he loped with easy speed across the broken ground. His name was derived from his serial initials, of course, but it was apt, nevertheless, for the SPD models were among the fastest robots turned out by the United States Robot amp; Mechanical Men Corp.

“Hey, Speedy,” howled Donovan, and waved a frantic hand.

“Speedy!” shouted Powell. “Come here!”

The distance between the men and the errant robot was being cut down momentarily – more by the efforts of Speedy than the slow plodding of the fifty-year-old antique mounts of Donovan and Powell.

They were close enough now to notice that Speedy’s gait included a peculiar rolling stagger, a noticeable side-to-side lurch – and then, as Powell waved his hand again and sent maximum juice into his compact headset radio sender, in preparation for another shout, Speedy looked up and saw them.

Speedy hopped to a halt and remained standing for a moment with just a tiny, unsteady weave, as though he were swaying in a light wind.

Powell yelled: “All right, Speedy. Come here, boy.”

Whereupon Speedy’s robot voice sounded in Powell’s earphones for the first time.

It said: “Hot dog, let’s play games. You catch me and I catch you; no love can cut our knife in two. For I’m Little Buttercup, sweet Little Buttercup. Whoops!” Turning on his heel, he sped off in the direction from which he had come, with a speed and fury that kicked up gouts of baked dust.

And his last words as he receded into the distance were, “There grew a little flower ‘neath a great oak tree,” followed by a curious metallic clicking that might have been a robotic equivalent of a hiccup.