Rural School Leaflet, 665 



a great bonfire. I want you to have a good big bonfire ; so, if the school- 

 grounds do not furnish enough material, bring in some brush and leaves 

 from the neighboring fields until you have a pile six or eight feet high. 

 Do not be in a hurry to light the fire. Let it dry several days and then 

 choose a quiet day, when there is little or no wind blowing. 



Before you start the fire, each boy and girl should have a handful of 

 small scraps of thin paper (tissue paper is best), and one strip of paper 

 about two feet long and one inch wide. 



WHien everything is ready, form in a circle and light the fire. Now 

 is the time to watch carefully everything that takes place. At first 

 the smoke will rise from the fire slowly and then more rapidly. When 

 the fire gets well started, you will see burning leaves rise with the smoke. 

 Xow, if you toss some of your scraps of paper toward the fire they will 

 be caught and carried up also. \\^hen the fire is burning briskly, stand 

 with your side to the fire and hold one of the strips of paper by one end 

 in front of you and let the other end fall toward the ground. If the fire 

 is strong enough the end near the ground will move toward the fire, which 

 shows that the wind is blowing toward the fire. Xow you have made 

 the wind blow. Can you tell why it blows from all sides toward the fire 

 and rises over the fire? If you can, you will know why all the winds of 

 the world blow. 



Let me help you a little. The fire heats the air over it, and when 

 air is heated it expands and becomes lighter than cooler air and there- 

 fore rises, or more correctly is lifted or pushed up by the cooler air. 

 If you take a little piece of wood and push it down to the bottom of a pail 

 full of water and then suddenly let it go, you will see it rise to the top 

 of the water very cjuickly. The piece of wood rises because it is lighter 

 than the water. Heated air rises because it is lighter than cold air. 

 The wind blows toward the fire because when the heated air rises there 

 must be more air to take its place. The winds thus blow toward the 

 warmest place. 



Write your answers to these questions : 

 Why does the smoke go up the chimney? 

 What do you mean when you say "the stove draws?" 

 Why does the stove "draw?" 



A\'h}' does the water come up out of the well when you work the 

 pump handle? 



