"For example?"
"Oh! sulphur, ores, gold perhaps, possibly new elements."
"Cost of carriage," I said. "You know you're not a practical man. The moon's a quarter of a million miles away."
"It seems to me it wouldn't cost much to cart any weight anywhere if you packed it in a Cavorite case."
I had not thought of that. "Delivered free on head of purchaser, eh?"
"It isn't as though we were confined to the moon."
"You mean———?"
"There's Mars—clear atmosphere, novel surroundings, exhilarating sense of lightness. It might be pleasant to go there."
"Is there air on Mars?"
"Oh yes!"
"Seems as though you might run it as a sanatorium. By the way, how far is Mars?"
"Two hundred million miles at present," said Cavor airily; "and you go close by the sun."
My imagination was picking itself up again. "After all," I said, "there's something in these things. There's travel———"
An extraordinary possibility came rushing
