ding Elms in Baltimore. 
ideal tree described are: Its small breadth in rela- 
tion to its height—that is, its narrow columnar 
form—makes it particularly suited for row plant- 
ing. The young scions can be planted as close 
together as 15 feet in order to create in only a 
few years a thick, strong, rich wall of foliage. 
Or planted at greater intervals, its repeated up- 
right form makes an ideal avenue of trees. 
The branch structure of the Augustine Ascend- 
ing Elm is unusual. The main branches rise at 
angles of about 70 to 85 degrees from the horizon. 
This markedly upslanting branch structure has 
two very important advantages. First, the down- 
ward twisting force on the crotches where the 
branches join the trunk is very small. Second, 
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