742 



Handbook of Nature-Study 



trees ? What is the shape of the head ? What is the height of the trunk 

 below the branches? What is the height of the tree? How large around 



Blossoms of the silver maple. 

 Photo by Ralph Curtis. 



is the trunk three feet from the ground ? Can you find when the tree was 

 planted ? Can you tell by the shape of the tree from which direction the 

 wind blows most often ? 



2. Can you find seeds on your tree? Each pair of seeds is called a key. 

 Sketch a key, showing the way the seeds are joined and the direction of the 

 wings. Sketch the stem which holds the key to the twig. Are both seeds 

 of the key good or is one empty ? How are the seeds scattered and planted ? 



Blossoms of mountain maple. 



Photo by Ralph Curtis. 



