THE floor of our schoolroom is level. The playground is almost, if not quite, level. As you look
away from the school, is the land nearly level? Did you ever see a broad extent of nearly level
Let us imagine that we are out on a piece of nearly level land, many, many times larger than our
playground. Such a broad, nearly level stretch of land is called a plain.
SUCH A BROAD LEVEL STRETCH OF LAND IS CALLED A PLAIN
If this plain were covered with rich green grass and beautiful flowers, we should call it a prairie.
In the summer it is a vast sea of
 waving grass. On the prairie we might find herds of wild horses
and cattle, which feed upon the rich grass. If it were late in the summer, when the grass is dry and
crisp, it might catch fire, and we might then see a grand sight—a prairie on fire.
We now come to another plain, miles and miles long, miles and miles wide. No rain falls here, and
therefore we see no grass, nor flowers, nor cattle, nor horses, nothing but dry, burning sand,
rocks, or gravel. We are in a desert. But we are so thirsty and tired!
 No water to drink, no shade from the burning sun! Suddenly, in the midst of the desert, we come to a
beautiful grassy spot. There is a cluster of date-palm trees, and, better still, a well or a spring
of fresh water. This
 pleasant spot in the desert is called an oasis. Here we may quench our thirst,
and rest beneath the shade of the trees.
An oasis is a fertile spot in a desert. What does fertile mean?
When do we say land is fertile? When
barren? When desert?
THIS PLEASANT SPOT IN THE DESERT IS CALLED AN OASIS
Find a picture of a palm tree, and try to draw it.
If we were really in a desert, we might see a company of merchants carrying goods to sell in the
countries they visit. Such a company is called a caravan. The goods are packed in bundles, which are
carried on camels' backs. The camel can live for a long time without drinking, and can carry a heavy
load of merchandise a long distance. It is sometimes called the ship of the desert.
Why do travelers use camels to cross the desert? Why do they not use horses? If you can not find
answers to these questions in your books at home, ask your teacher about them.
You have seen a small whirlwind in the street. The leaves flew round and round,
 the dust whirled
along in clouds. Trees are sometimes torn from the ground, and houses overturned, by a strong wind.
Now think of a wind-storm in the desert. A loud, rustling noise is heard. Great clouds of fine sand
are lifted into the air—clouds which darken the sun! Travelers must at once jump from their camels,
cover themselves with their cloaks, and lie flat on the ground.
The poor beasts will close their eyes and nostrils, and kneel with their backs to the wind until the
storm has passed over.
Thankful will the travelers be if none of them are buried in the sand.