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BY MEANS OF NATURAL SELECTION, OR THE
vsriability—Indlvidital difierences—Doubtful species—Wide ranging, much
diffused, and common species, vary most—Species of the larger genera
in each country vary more frequently than the species of the smaller
genera—Many of the species of the larger genera resemble varieties in
being very closely, but unequally, related to each other, and in having
- o a 0 0 - o .
restricted ranges .