Of course, that is to be used when we
pass beyond the atmosphere. In the latter space I shall use a
different force, as I also shall when we approach Mars."
"Then you can't see this force?" asked Mark.
"No more than you can see the wireless impulses that flow from
the wires of an aerial station."
"Yet it's there, just the same," spoke Jack.
"Indeed, it is," answered the scientist. "But, now I must get
back to my motor."
"Yes," added Professor Henderson, "we must, all get busy. What
are you going to do, Andy?"
"Well, I thought I'd go off hunting. I'm no good at building
machinery. I thought you might like something for dinner--say a
brace of ducks."
"Good!" cried Jack, who was fond of eating, which, perhaps,
accounted for his stoutness.
It was a fine day, just right for hunting, and Andy set off with
his gun over his shoulder.
"I wonder if there'll be any game on Mars," said Mark. "I think
I'd like to hunt there with Andy."
"If other things are in proportion, the game there will be very
different from that on this earth," said the scientist.
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