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 
Fic. 43.—An oak in winter condition. 
acquainted with the common trees of a neighborhood and 
to learn to recognize them hy 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- 
