PRACTICAL ARBORICULTURE 



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409 



TYPICAL ELM 



THE ELM. 



Ulmus. 



There are four varieties of the Elm native to America, and others of Euro, 

 pean origin are grown in the nurseries for ornamental planting. 



Ulmus Americana, or White Elm, is the most abundant and better known. 

 The beauty of the Elm for street trees, for park and ornamental purposes, is well 

 known, and it is so highly valued that unusual efforts are made to protect the 

 trees from insects which of recent years have threatened its destruction. 



In the fine parks of Cincinnati and along the Limestone hills of the Ohio, large 

 numbers of old and greatly valued trees (Elms) have died recently, presumably 

 caused by excessive droughts several years in succession, and it is feared that all 

 these noble trees will succumb unless there should be a decided change in the cli- 

 matic conditions of Ohio and Indiana. 



In the mechanical arts the Elm plays a very important part. It is quite light, 

 strong, flexible to a considerable degree, and possesses in a remarkable extent the 

 quality of remaining in any position or shape to which it may be bent while in a 

 heated and softened condition, afterwards becoming hard. 



It is thus used in various bent forms for wagons, carriages and sleigh works, 

 for agricultural and other machinery, and similar uses. 



