CHAPTER II. 
CLASSIFICATION OF PLANTS. 
Classification of plants, like that of their organs, is 
based upon phylogeny, itself investigated by the comparative 
method described in Chap. I. We have seen (pp. 21 — 25) 
that accumulation of variations leads to the modification of 
organs ; we may now go a stage further and apply it to species. 
Evolution 1 . The diagram here given is intended to 
roughly illustrate the origin of new forms from pre-existing 
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See also Note on p. 208*. 
8—2 
