Tisalver said, “You’ll need proper clothing.” Mistress Tisalver sniffed markedly in the background.

Cautiously, Seldon, thinking of kirtles with vague distress, said, “What do you mean by proper clothing?”

“Something light, such as I wear. A T-shirt, very short sleeves, loose slacks, loose underpants, foot socks, open sandals. I have it all for you.”

“Good. It doesn’t sound bad.”

“As for Mistress Venabili, I have the same. I hope it fits.”

The clothes Tisalver supplied each of them (which were his own) fit fine—if a bit snugly. When they were ready, they bade Mistress Tisalver good-bye and she, with a resigned if still disapproving air, watched them from the doorway as they set off.

It was early evening and there was an attractive twilight glow above. It was clear that Dahl’s lights would soon be winking on. The temperature was mild and there were virtually no vehicles to be seen; everyone was walking. In the distance was the everpresent hum of an Expressway and the occasional glitter of its lights could be easily seen.

The Dahlites, Seldon noted, did not seem to be walking toward any particular destination. Rather, there seemed to be a promenade going on, a walking for pleasure. Perhaps, if Dahl was an impoverished sector, as Tisalver had implied, inexpensive entertainment was at a premium and what was as pleasant—and as inexpensive—as an evening stroll?

Seldon felt himself easing automatically into the gait of an aimless stroll himself and felt the warmth of friendliness all around him. People greeted each other as they passed and exchanged a few words. Black mustaches of different shape and thickness flashed everywhere and seemed a requisite for the Dahlite male, as ubiquitous as the bald heads of the Mycogenian Brothers.

It was an evening rite, a way of making sure that another day had passed safely and that one’s friends were still well and happy. And, it soon became apparent, Dors caught every eye. In the twilight glow, the ruddiness of her hair had deepened, but it stood out against the sea of black-haired heads (except for the occasional gray) like a gold coin winking its way across a pile of coal.

“This is very pleasant,” said Seldon.

“It is,” said Tisalver. “Ordinarily, I’d be walking with my wife and she’d be in her element. There is no one for a kilometer around whom she doesn’t know by name, occupation, and interrelationships. I can’t do that. Right now, half the people who greet me … I couldn’t tell you their names. But, in any case, we mustn’t creep along too slowly. We must get to the elevator. It’s a busy world on the lower levels.”

They were on the elevator going down when Dors said, “I presume, Master Tisalver, that the heatsinks are places where the internal heat of Trantor is being used to produce steam that will turn turbines and produce electricity.”

“Oh no. Highly efficient large-scale thermopiles produce electricity directly. Don’t ask me the details, please. I’m just a