FOREST TREES OF NORTH AMERICA. 



Species which grow from the ground with a siugle stem, either wholly or over a large portion of the area of 

 their distribution, are admitted as trees into the following catalogue, without reference to the height or size they 

 may attain. 



The line which divides trees from shrubs is entirely arbitrary, and ife often unsatisfactory in application. A 

 separation of this nature, however, based upon habit rather than upon size, is perhaps less objectionable, all things 

 considered, than any other, and serves at least to keep this catalogue within reasonable limits. 



The word "compact", used in the description of various woods mentioned in the catalogue, indicates that they 

 show no tendency to check or open in drying, and does not refer to their structure. 



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