106 Lessons in Nature Study. 



Chapter -T7 t 

 RAINY-DAY LESSONS. 



LESSONS ON WATER. 

 I. Forms of Water. 



Select a lump of ice, and bring it into the school-room. 

 What is this ? Describe it. Clear, cold, brittle. Give each 

 child a piece. What does it do when brought into the 

 house ? Why does it melt in the hand ? Let us hold the 

 thermometer-bulb on the ice. What does the quicksilver do 

 in the thermometer ? How far does it go down ? We will 

 melt this piece of ice. What does the heat change it into ? 

 Is ice " lighter or heavier than water ? Will it float on 

 water ? Why does the ice stay on the top of the pond 

 instead of sinking ? 



II. 



Now let us put the water on the stove. What does it do ? 

 What comes off from this boiling water ? Let us put the 

 thermometer in this boiling water. What does the quick- 

 silver do now ? How high does it rise ? What does cold do 

 to the quicksilver ? Heat ? Let us put just a little water in 

 this baking-powder box, and set it on the stove. We will 

 put the cover on tightly, and make a small hole in the 

 cover with an awl. When the water boils, what happens ? 

 Hold a cold piece of glass in the steam a moment. What 

 is on the glass ? Breathe on the glass. What is there on 

 the glass now ? We call water when cold and solid ice ; 

 when liquid, as we usually see it, water ; when hot, coming 

 from boiling water, steam, vapor. In what form is water 



