180 NATUBE-STUDT LESSONS. 



LIV.-HAIL. 



1. (fl) Observe the conditions of the atmosphere as to 



temperature immediately before a hailstorm, 

 during the storm and immediately after. 



(d) Also observe carefully the clouds as to appear- 

 ance and motion during the storm. 



{c) What was the temperature of the atmosphere 

 just before the storm ? 



(d) What effect had the storm upon the tempera- 



ture ? 



(e) Describe the clouds as to kind, height and 



movement as the storm was advancing. 



2. (a) How did the hail fall, straight or slanting ? 



(d) Account for the direction of its fall by refer- 

 ence to the conditions of the atmosphere 

 and clouds at the time. 



3. (a) Examine the hailstones. 



((5) Describe their appearance, color, size, shape. 



4. {a) Compare a hailstone with a flake of snow. 

 ((5) In what points are they alike ? 



(c) In what are they different ? 



5. (a) What must be the condition of the atmosphere 



as to temperature where hail is formed ? 



(I') How does this temperature of the upper air 

 where hail is formed compare with that of 

 the atmosphere at or near the earth during 

 the storm ? 



(c) What would you infer from these facts concern- 

 ing the temperatures of different strata of air ? 



It is not correct to suppose that the temperatures of different strata of 

 air differ according to their height. It frequently occurs that a stratum of 

 air of a temperature at or below the freezing point of water lies between 

 two strata of air of considerably higher temperature. 



