"It's the sun," answered Donald from the floor, where he was playing
with his great St. Bernard dog, Barri. "You know it rises earlier and
sets later every day now than it did a while ago. It's hotter too."

"It goes higher at noon," said Frank. "In the middle of summer it is
almost straight over our heads, and in the winter it seems ever so much
farther to the south. I've often noticed that."

"So have I," said Donald. "And in the winter the shadows are longer than
they are in summer. It must be because the sun isn't so high up."

"Aren't shadows funny?" said Susie. "One day when I was coming in to
dinner, just for fun I tried to walk on my shadow, and I could step on
my head."

"I've done that lots of times," said Donald. "But it's a strange thing.
Sometimes I can step clear over my head--I mean in the shadow--and then
again I have to step on it."

"And when you jump," said Susie, "it spoils it. The shadow always jumps
too."

"What kind of weather was it when you had to jump to it?" asked Uncle
Robert.

"I don't remember," said Donald. "Would the weather make any
difference?"

"I remember," said Susie, "because one time when I was jumping that way