Take a flat stone and put it over some grass. In a week or so
lift up the stone and see what has happened."
Hal and Mab did this, after they had helped their father put the boards on
the celery. Then, a week later, they lifted up the stone which they had
laid over a spot on the lawn.
"Why, the green grass has all turned white!" cried Hal. And so it had.
"That's how my celery will turn," said his father. "The grass grew pale
from being in the dark so long. It did not like it, and if you left the
stone there too long the grass would die. Now take it away and in a day
or so the grass will be green again."
And that's exactly what happened. The sun had tanned the grass green as it
tans children brown at the seashore.
One day, when Mab and Hal had started out with their father who was going
to show them how to dig potatoes, which is not as easy as it sounds, the
children suddenly heard a yelping and barking sound in Mr. Porter's
garden.
"There's Roly-Poly in trouble again!" called Mr. Blake.
"Yes, and he's hurt, too!" added Hal, for the little poodle was yelping as
if in pain.
"Oh, what has happened to him?" cried Mab.
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