The woman assistant answered and said that the two men were on the way up right now. I asked, "What have they been doing down there?"

She said, "They've been doing Caesarian sections on the animals in test-pen M-four."

"Caesarian sections?" I repeated. She affirmed it, and Dolores Donet got a tight, little, humorless smile on her face. I hung up and said, "They're on their way up, and what's so funny?"

She said, "You know what I think? I think you've been using Atummyc products on you."

"So what?" I demanded. "I was responsible for this campaign, too. I've been waiting for a rash to develop almost as long as you have."

She said, "When Bob comes in, look at his complexion. All three of us have been guinea pigs, I guess."

"I still don't see what's so damned amusing."

She said, "You still don't tumble, eh? All right, I'll spell it out. Caesarians performed on test batch M-four."

"So?"

"The 'M' stands for male," she said.