DECIDUOUS TREES. 131 
that can suvcessfully maintain their ground when com- 
peting with the Elm, it is best to give it plenty of room, 
and it will soon make as much shade or timber as half 
a dozen crowded specimens would produce. It is also 
best to remove them from the nursery rows when quite 
small. If allowed to remain until they are ten feet high, 
the roots, which are very numerous, will form an intricate 
mass, which it is very difficult to extract from the soil 
without seriously injuring a large portion of them, 
