"Perhaps I had better put it this way. Supposing you were to—— Well, we'd better begin further back than that. You know what—— No, I don't suppose you do know that. Well, if I—that is to say, when a man—you know, it's rather difficult to explain this, Margery."

"Are you explaining it now?"

"I'm just going to begin."

"Thank you, Uncle."

I lit my pipe slowly, while I considered again how best to approach the matter.

"'Home Rails Firm,'" said Margery. "Isn't it a funny thing to say?"

It was. It was a very silly thing to say. Whoever said it first might have known what it would lead to.

"Perhaps I can explain it best like this, Margery," I said, beginning on a new tack. "I suppose you know what 'firm' means?"

"What does it mean?"

"Ah, well, if you don't know that," I said, rather pleased, "perhaps I had better explain that first. 'Firm' means that—that is to say, you call a thing firm if it—well, if it doesn't—that is to say, a thing is firm if it can't move."