"The shadow stick may help us there," said Uncle Robert.

"I am afraid I shall forget," said Donald.

"I have some little notebooks in my trunk," said Uncle Robert. "Suppose
I give you each one and let you write down what the thermometer and the
shadow stick say every day."

"What fun that'll be!" cried Susie. "When may we begin?"

"To-morrow morning, if you like," replied her uncle. "I will get the
books for you now."

He went away to his room, and soon returned with the notebooks.

"I'll tell you, uncle," said Frank as he thanked Uncle Robert for his
book, "how would it do for each of us to look at the thermometer at a
different time of the day?"

"The very thing!" replied Uncle Robert, well pleased. "You are always up
early, Frank, so suppose you look at six in the morning, Susie at twelve
o'clock, and Donald at six in the evening. How will that do? Then we
shall have the record for the whole day."

"I think it will be such fun!" said Susie. "I wonder if our books will
be very different."

"What makes you think they will be different?" asked Uncle Robert.

"It's always hotter at noon than it is at night or in the morning," said