to the barn, after giving him the mail, he heard him say:

"Here, Frank, is the Weather Report. Open it and look at it while I read
my letters."

Donald took off the saddle and gave the horse her supper. Then he
hurried back to see what Frank had found on the inside of the
important-looking wrapper. It proved to be a map with queer, crooked
lines all over it, but it did not look at all interesting.

"Here it says temperature," said Frank, pointing to a list of figures in
the corner. "Perhaps this is what we want."

"I don't see any numbers there like mine," said Donald, taking his
notebook from his pocket.

"Let me help you," said Uncle Robert, laying aside his letters and
coming to where they sat on the steps.

They made room for him, and, as he took the map, he explained:

"This, you see, is a map of the United States. These dotted lines tell
about the temperature. For instance, look at this one which is marked
fifty degrees. At every place in the country that is touched by this
line on the map the thermometer stood at fifty degrees at the time the
map was made."

[Illustration: United States weather map.]

"See," said Susie, "how crooked the line is. Why isn't it straight,