o you know?" Jed Tighe demanded. "If I'm goin' to act on what you
boys say, I'd like to know how you find out."

"I've been wondering," put in Anton thoughtfully, "if it wouldn't be a
good idea to have Mr. Tighe go over the map with us. He might be
interested in figuring it out, and then if we didn't hit it just right,
he'd know we'd done our best, anyway."

"Well," rejoined the farmer grimly, "if I've got to hand you over some
of my crop this fall, I might as well find out what sort of project I'm
supporting. I really would like to see how you find out. You boys
certainly made good on that frost business the other night."

From a hook over the compositor's "case," Fred reached down a sheaf of
the Daily Weather Reports, and laid those for the last three days on the
table in front of Anton. The Forecaster stood by to help the crippled
lad and to correct him if he made any mistakes in his explanations.

"All our weather in the United States," the boy began, explanatorily,
"comes from the west."

"Why?" snapped back Jed Tighe.

The Forecaster smiled. He realized that the question went to the very
root of weather knowledge. The query was a poser to Anton. He stammered.

"I know it does," he said, "but just why, I--I--"

"You'll have to begin at the beginning, Anton," put in the Forecaster
quietly. "If Mr. Tighe really wants to know, you can't take anything for
granted. Explain to him the circulation of the atmosphere, just the way
I taught it to you during the winter."

The crippled lad's face brightened. He knew, now, how to proceed.

"All changes of weather, Mr. Tighe," he said, "happen because of the
winds, and all the changes of winds are due to the differences in heat
at various parts of the globe, especially at the equator, where it is
always hot, and at the poles, where it is cold nearly all the year
round."

"You mean to say that the weather at the North Pole and at the equator
has anything to do with our weather here?"

"Everything," Anton answered, nodding his head. "The heat of the sun is
what causes weather changes, because winds are due to the heating of the
air, and the sun is the only thing that heats the air. At the equator,
where the sun shines nearly overhead all the year round, the air gets to
be very hot. Hot air expands, and as it gets bigger, it displaces the
cold air above it. Gravity pulls down the colder air on both sides of
this belt of rising hot air, and the down-flowing cold air on