On the Origin of Species, by Charles Darwin, Part 3
Boring Books for Bedtime Readings to Help You Sleep
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Whether to Rank a Form as a Variety or a Species
Doubtful and closely-aligned forms have permanently retained their characters in their own country for a long time. In very many cases, however, one form is ranked as a variety of another. The opinion of naturalists having sound judgment and wide experience seems the only guide to follow.
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