A kingfisher swept by them with a voice like a watchman's rattle.
"He knows how to catch fish better than we do," said Donald.
Susie picked up some pebbles and put them in her apron. She tried to get a number of colors. Some were nearly red, some were blue, and some were white.
"Can you find one that is exactly round?" asked Uncle Robert.
"Here's a white one that's almost round," and Susie held up a quartz pebble.
"Where do you suppose this little white pebble came from?" asked Uncle
Robert.
"Did it come from away up the river—a long way?" said Donald.
"I think so. One day this pebble was a part of some rock or quarry. How it was broken off, how it came down, how it was made round, is well worth studying."
"Oh, tell us about it, please," begged Susie.
"We'll read about it together," said Uncle Robert, "in the Big Book."