There was no well-marked boundary to the Sand Hills, but
gradually, and almost before we realized it, we found ourselves
surrounded by them. We came to a crossing of the railroad, and in
a little cut a few rods away we saw the sand drifted over the
rails three or four inches deep, precisely like snow.
"Well," said Jack, "I guess we're in the Sand Hills at last
if we've got where it drifts."
"I wonder if they have to have sand-ploughs on their
engines?" said Ollie.
"I've heard that they frequently have to stop and shovel it
off," answered Jack.
As we got farther among the sand dunes we found them all
sizes and shapes, though usually circular, and from fifteen to
forty feet high. Of course the surface of the county was very
irregular, and there would be places here and there where the
grass had obtained a little footing and the sand had not drifted
up. There were also some hills which seemed to be independent of
the sand piles.
We stopped for noon on a little flat where there was some
struggling grass, This flat ran off to the north, and narrowed
into a small valley through which in the spring probably a little
water flowed.
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