"But, Captain Drummond! "
"What is it?"
"When do you suppose this rock was made?"
"Can't just say, Daisy. Some rocks are young, and some are old, you know. This is one of the old rocks."
"But how do you know, Captain Drummond?"
"I know by the signs," said the Captain.
"What is an old rock? how old?"
"I am sure I can't say, Daisy. Only that a young rock is apt to be a good deal older than Adam and Eve."
"How can you tell that?"
"When you see a man's hair grey, can't you tell that he is old?"