LIFE STORY OF THE OAK 203 
Like the pines and firs, they cast a crop of leaves after 
it has been on the tree for two or more years, a new 
crop being grown each year. The holly, the rhododen- 
drons, and the laurel are examples of broad-leaved ever- 
green trees and shrubs. These leaves, though they are 
broad, are thick and have a hard covering, so that they 
do not give off so much water in the winter as thinner 
and softer leaves would. 

