74 



ICE 



Composition. Write a composition telling how 

 water freezes and how the ice looks. In the first 

 paragraph describe the bits of ice that first form in 

 the cup, in the second paragraph describe the ice 

 when it has become a sheet, and in the third para- 

 graph tell how the water froze 

 in the bottle. 



SUPPLEMENTARY WORK 



Ice Needles. In a pond ice forms 

 in the same way as it does in a cup 

 or bottle. At first it is in scattered 

 needles, but when a great number 

 of needles have formed, the ice is 

 in one sheet, or block. Look at a 

 thin scum of ice on some water just 

 before the sheet is complete. Are 

 the openings between the needles 

 round, or long and narrow? Are 

 the edges of the openings smooth, 

 or are they like saw teeth ? What 

 makes the saw teeth? Look for 

 needles and combs of ice on the 

 sides and bottom of a pail of freez- 

 ing water. 



Notice the frost on a window on 

 a very cold day. Do you see any 

 ice needles there ? The needles are 

 often arranged in beautiful shapes. 

 What ice forms have you seen ? The ice is made from the 

 steam or watery vapor in the air. Why are kitchen windows 

 often covered with ice when the windows of the sitting room 

 have little ? 



ICE NEEDLES IN A BOTTLE 

 OF WATER 



