44 A TEXT-BOOK OF BOTANY 



tree has a general conical outline; in the latter case it has a 

 spreading top or crown. It is an excellent plan to become 



FIG. 43. An. oak in winter condition. 



acquainted with the common trees of a neighborhood and 

 to learn to recognize them by their habits. Trees are also 

 an excellent illustration of the fact that while the main 

 stem of a plant may be erect, the branches may be di- 



