"Well, Daisy?" said her friend, watching how Daisy's countenance woke up from its subdued expression.
"Dr. Sandford, how could these things grow on the rock? these green things?"
"What green things?"
"Why, ever so many sorts. Here is moss, a great deal of it, of different kinds; and there is beautiful brake at the top, like plumes of feathers. How can they grow there?"
"Why not?"
"I thought everything wanted some earth to grow in."
"Have they none?"
"I don't know. I thought not. They must have very little indeed, Dr. Sandford."
"Very little will do, I suppose."
"But I do not see how any earth got there," said Daisy. "It was only a bare rock at first, of course."