“Hallo! You again? What do you think of this theory—that the Egyptians derive from a Saharan civilisation?”

“I don’t think,” I said.

“It’s nonsense. This fellow——”

I interrupted him.

“Do you want that skit back, or can I keep it?”

“Skit? What skit?”

“The thing you gave me yesterday.”

“That! Light your fire with it. This fellow——”

“Yes,” I said; “I’ll light a fire with it. I see you’re busy.”