“I’m sorry,” Fay said with light contrition. “Well, now you’ve sniffed at it, how about trying on Tickler?” He picked up the gleaming blunted crescent and jogged it temptingly under Gusterson’s chin.

“Why should I?” Gusterson asked, stepping back. “Fay, I’m up to my ears writing a book. The last thing I want is something interrupting me to make me listen to a lot of junk and do a lot of useless things.”

“But, dammit, Gussy! It was all your idea in the first place!” Fay blatted. Then, catching himself, he added, “I mean, you were one of the first people to think of this particular sort of instrument.”

“Maybe so, but I’ve done some more thinking since then.” Gusterson’s voice grew a trifle solemn. “Inner-directed worthwhile thinkin’. Fay, when a man forgets to do something, it’s because he really doesn’t want to do it or because he’s all roiled up down in his unconscious. He ought to take it as a danger signal and investigate the roiling, not hire himself a human or mech reminder.”

“Bushwa,” Fay retorted. “In that case you shouldn’t write memorandums or even take notes.”

“Maybe I shouldn’t,” Gusterson agreed lamely. “I’d have to think that over too.”

“Ha!” Fay jeered. “No, I’ll tell you what your trouble is, Gussy. You’re simply scared of this contraption. You’ve loaded your skull with horror-story nonsense about machines sprouting minds and taking over the world—until you