I sat taking it in.

"You see?" he said.

"Oh, I _see_."

"Practically we shall be able to tack about in space just as we wish. Get
attracted by this and that."

"Oh, yes. That's clear enough. Only--"

"Well?"

"I don't quite see what we shall do it for! It's really only jumping off
the world and back again."

"Surely! For example, one might go to the moon."

"And when one got there? What would you find?"

"We should see--Oh! consider the new knowledge."

"Is there air there?"

"There may be."

"It's a fine idea," I said, "but it strikes me as a large order all the
same. The moon! I'd much rather try some smaller things first."

"They're out of the question, because of the air difficulty."