cup of tea across the room to the Earl, "if cups of tea had no weight at all! Then perhaps ladies would sometimes be permitted to carry them for short distances!"
"One can easily imagine a situation," said Arthur, "where things would necessarily have no weight, relatively to each other, though each would have its usual weight, looked at by itself."
"Some desperate paradox!" said the Earl. "Tell us how it could be. We shall never guess it."
"Well, suppose this house, just as it is, placed a few billion miles above a planet, and with nothing else near enough to disturb it: of course it falls to the planet?"
The Earl nodded. "Of course——though it might take some centuries to do it."
"And is five-o'clock-tea to be going on all the while?" said Lady Muriel.
"That, and other things," said Arthur. "The inhabitants would live their lives, grow up and die, and still the house would be falling, falling, falling! But now as to the relative weight of things. Nothing can be heavy, you know,
