"I cannot imagine that either, Dr. Sandford."
"Give it up, Daisy," said the doctor, rising, and beginning to put himself in order for travelling.
"Are you going?" said Daisy.
"Not till you have done with me!"
"Dr. Sandford, have you told me all there is to tell about the sun?"
"No."
"Would it take too long this evening?"
"Considering that the sun will not stay to be talked about, Daisy," said the doctor, glancing out of the window, "I should say it would."
"Then I will ask only one thing more. Dr. Sandford, how can you tell so exactly how long it would take to go to the sun? How do you know?"
"Quite fair, Daisy," said the doctor, surveying her gravely. "I know, by the power of a science called mathematics, which enables one to do all sorts of impossible things. But you must take that on my word; I cannot explain so that you would understand it."