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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Fic 1 — Cell structure of a tree (1) Appearance of a section of spruce 
wood, natural size, (2) Cell structure of same, magrified roo 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 
