FULL-GROWN PLANT AND ITS PARTS AT 
The trunk of the wych-elm tree and its branches. Study 
carelully the way the branches of the elm are formed 
and you will see why the main stem is soon lost. Such 
a stem is said to be deliquescent, because it seems to be 
dissolved. Compare large elms grown in the forest 

Fic. 76. Diffuse type of elm. 
with those grown in the field. Why are they so 
different ? Compare pines, spruces, and larches grown 
in the field with those grown in the woods. What are 
the points of difference and why? Why do the pines 
and larches still have so different a habit from the 
oaks, elms, apple trees, and some others ? 
