"Night, you mean; it won't be day for six months," interrupted Jack Frost.
"Good night, then; I really must be going."
"Not until you've carved your initials on the North Pole," said Sterry Optican. "It's my autograph album, you know, and I have the names and initials of many famous people on it. Why, even my own is there."
"Thank you very much," said Billy, nervously, "but I really can't spare the time."
"That's all you know about the North Pole," said Jack. "You could stay there a year and not be spending a minute."
"What do you mean?" asked Billy in surprise.
"Just what I say, this time—how are days, hours, minutes and seconds measured? Answer me that."
"By the length of time it takes a given point to completely revolve about the earth's axis," answered Billy, not quite sure that this was the exact definition, but thinking it was near enough.
"Right," said Jack; "and so, if you are on the axis, the North Pole, that is, you can't revolve around it, can you?"