240 NATURE STUDY AND AGRICULTURE 



things about crystallization is that each substance has a 

 definite geometrical plan upon which its crystals are built. 

 If the wind is blowing strongly, note how the drifts are 

 made. Why are these drifts in some places and not in 

 others? Note the drifts near buildings and trees. Can 

 you account for the spaces left near the trees and buildings ? 

 These are due to the wind currents striking the object and 

 rebounding, carrying the snow back with them. 



In the same way, observation of sleet, hail, and rain 

 storms should be taken up informally as these phenomena 

 occur. 



