_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? (South and West.) What winds prevail in winter? (North.) _f._ What work have you seen the wind do? (Turn windmills; sail boats.) Have you seen it do any work for us here? (Yes; it drives the clouds that bring us rain. It drives away stormy clouds.) Can't you think of something else? (It scatters seeds of plants. It shakes nuts from trees. It helps melt snow and ice. It keeps the air clean and pure.) 3. _Literature._ _a._ As an introduction to the lesson or in preparation, give the first two stanzas of that beautiful poem by W. B. Rands, _The Child's World_ (Volume II, page 66). _b._ In considering the strength of the wind, there is a fine opportunity to introduce the fable _The Wind and the Sun_ (Volume I, page 95). _c._ Robert Louis Stevenson's verses, _Windy Nights_ (Volume II, page 123), are entertaining and give an opportunity for nice explanation. _d._ In the same light as the preceding selection may be regarded the imaginative verses by the same author, _The Wind_ (Volume I, page 440).