6 Characteristics, Structure, Life of Trees 



Structure. That a tree, like every other living thing, is 

 composed of tissues made up of minute cells varying in 

 shape, size, and thickness of cell-wall, is probably well 









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71 . /,'■ 



Fig. I. — Cell structure of a tree, (i) Appearance of a section of spruce 

 wood, natural size; (2) Cell structure of same, magnified 100 times (after 

 Hartig, from Department of Agriculture, Forestry Division Bulletin, No. 10). 



known to everybody. But that the bulk of the bole of the 

 tree is really not living but dead tissue, composed of cell 

 cases without living contents, is perhaps less well known. 

 While partially active in conducting water, most of the 

 wood is merely supporting tissue. It is for this reason 



