"How is that?" asked Donald.

"When is your shadow the longest?" asked Uncle Robert.

"In the evening," said Donald.

"In the morning," said Susie.

"When is your shadow the shortest?"

"At noon!" they all shouted.

"When is it coolest?"

"Morning," they replied together.

"When is it warmest?"

"Noon," said Susie quickly.

"Now you are wrong," said Frank. "It is often warmer at one or two
o'clock."

"Frank is right," said Uncle Robert. "How can we tell just how warm it
is at any time?"

"If we had a thermometer," said Donald, "that would tell, but we
haven't."