I had never been inside his laboratory before, or even seen what “Dr. Mark Bradley” looked like on his letter box. It was an ugly room on the top story of the Physics Building, with less scientific equipment in it than I had expected and a rather pervasive smell that I didn’t comment on because there was nothing to be said in its favor and doubtless nothing that could be done about it. I tidied the place up a bit, dusted the chairs, and soon had the kettle boiling on a tripod over a Bunsen burner. Mathews came, talked, drank tea, and had to leave for a lecture. My parents had promised to be there by four, and I was a little peeved by their lateness, not because it really mattered but because I could see it was making Brad nervous. He kept pacing up and down and looking out of the window. Suddenly he cried “They’re here!” and rushed out and down the stairs. But when he came back there was only my mother with him. She was full of apologies; she had been shopping and hadn’t noticed the time; and also my father couldn’t come owing to a meeting in the City that had lasted longer than usual. “Of course you shouldn’t have waited for me.” Then she looked appraisingly round the room, sniffing just as I had. “What a jolly little place! How secluded you must be here—almost on the roof! And all those wonderful-looking instruments—you simply must tell me about them.”

There were only a couple of microscopes, a chemical balance, and a Liebig condenser, but he went round with her, exhibiting and explaining, answering in patient detail even the most trivial of her questions, and all without the slightest trace of nervousness or reticence. It looked to me like a miracle, till I remembered that Mathews had said he was a good lecturer.

Then we had tea, and I knew that it was a miracle, because all at once he was actually chatting. She asked him most of the questions I had wanted to ask him, and he answered them all. About his early life in North Dakota, the farm near the Canadian border, droughts, blizzards, hard times, bankruptcy, the death of both his parents before he was out of grade school, and his own career since. She asked him such personal things—had he left a girl in America, did he have enough money? He said there was no girl and he had enough money to live on.

“But not enough to marry on?”

“I don’t want to marry.”

“You might—someday.”

“No.”

“How can you be certain?”

“Because of my work. It takes up so much of my time that it wouldn’t be fair to any woman to marry her.”

“She mightn’t let it take up so much of your time.”

“Then it wouldn’t be fair to my work.”

“Isn’t that rather … inhuman?”

“Not when you feel about your work as I do.”

“You mean as a sort of priesthood—with a vow of celibacy attached?”

He thought a moment. “I don’t know. I hadn’t figured it out quite like that.”

But the oddest thing was yet to come. About six o’clock a boy put his head in at the doorway, grinned cheerfully, and asked if he could go home. “I’ve fed the cats and mice and fixed all the cages, sir.”

Brad said: “You’d better let me take a look first.” He excused himself to us and was gone a few minutes; when he came back my mother was all ready for him. “What’s this about cats and mice and cages? Is that what the smell is?”

He smiled. “I hope it doesn’t bother you. I’m so used to it myself I hardly notice it.”

“But what do you have them for?”

“I don’t have them at all—they belong to the man next door. I keep an eye on them when he’s out. He uses them for his experimental work.”

“You mean—” She flushed a little. “But of course, that’s very interesting. I’d like to see your menagerie. Could I?”

I hoped he would have more sense and I tried to signal danger to both of them, but without effect. I didn’t know him well enough, anyway, to convey signals, and somehow at that moment I didn’t even feel I knew my mother well enough. She had a spellbound look, as if she were eager for disaster.