An athlete who can clear a horizontal bar at a height of six feet on the earth could clear the same bar at a height of thirty-six feet on the moon.

In other words, he could jump over a house, unless, indeed, the lunarians really are giants, and live in houses proportioned to their own dimensions and to the size of their mountains.

In that case, our athlete would have to content himself with jumping over a lunarian, whose head he could just clear--with the hat off.
These things are not only amusing, but important.

There can be no question that the force of gravity on the moon actually is as slight as it has just been described.

So, even without calling in imaginary inhabitants to lend it interest, the comparative inability of the moon to arrest bodies in motion becomes a fact of much significance.