e will present an outline on a single subject. New
possibilities will be seen in every direction if frequent use of the
list given above is made in finding suitable selections.

If we choose the wind as the subject of our model lesson, we may be sure
to cover several recitations that will lead us into reading, nature
study and language (oral and written). It is a subject that encourages
wide correlation. The outline might be the following:

1. _Purpose of the Lesson._ To teach the following facts:
_a._ That air occupies space.

_b._ That wind is air in motion and has force.

_c._ The directions and names of winds.

_d._ The uses of winds.

2. _Experiments and Observation._
_a._ _Take an empty bottle and thrust it squarely, mouth down, into
water._ Does the water rise in the bottle? (Only a little way.)
Why? (It can't get in. There is air in the bottle.)

_b._ _Raise the bottle slowly and tip it slightly so that a part of
the mouth is above the water, then push it horizontally into
the water._ Does the water go into the bottle now? (Yes.) Why?
(Because there is no air there to keep it out.) How do you
know? (I saw the air coming out in bubbles.) Why didn't the air
come out when we pushed the bottle down the first time? (The
water was too heavy; it held the air in.)

_c._ _Hold your hand close in front of your mouth and blow._ Can you
feel anything? (Yes; the air strikes my hand.) When you are out
in the wind can you feel it? (Yes; it pushes against me.) Can
it push hard? (Yes; sometimes it pushes over trees and houses.)
What is the wind? (It is air moving.)

_d._ Is the wind blowing today? Did it blow yesterday? From what
direction is it (was it) blowing? How do you know? (I saw trees
bending away from it. I felt it pushing from that side. It came
in at that window. The vane on the church steeple pointed that
way.)

_e._ When a wind comes from the South, what do we call it? (South
wind.) When a wind blows from the North what do we call it?
(North wind.) What wind brings cold weather? (North.) What wind
brings warm weather? (South.) What wind brings long spells of
rainy weather? (East.) What wind brings showers and
thunderstorms? (South and West.) What winds prevail in summer?