"How do you make that out?" asked Jack in some surprise.
"By subtracting ninety-two millions of miles, which is the
distance from the earth to the sun, from the number of miles
Neptune is away from the sun," said Mark.
"That's right," admitted Mr. Henderson. "You're very quick at
figures, Mark."
"Well, let's get to Mars," said Jack. "Maybe Andy can find some
new kind of game there."
"Me? I'm not going to any place so many millions of miles away
from here," answered the old hunter, looking up from his plate.
"It's good enough hunting here."
"Wait until you see," said Mr. Roumann with a smile. "I expect
to find many marvels on Mars."
"If we get there," added Mr. Henderson.
"We'll get there," declared Mr. Roumann confidently. "As I said,
I have long been interested in Mars, and one reason is that I
want to prove that there is life on it--that it is inhabited by a
superior race of beings. Another reason is that I expect to find
on it a supply--or at least specimens--of a most valuable
substance--"
Mr. Roumann stopped suddenly.
"Well?" asked Mr.
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