“It will be seen that I look at the term species, as one arbitrarily given for the sake of convenience to a set of individuals closely resembling each other, and that it does not essentially differ from the term variety, which is given to less distinct and more fluctuating forms. The term variety, again, in comparison with mere individual differences, is also applied arbitrarily, and for mere convenience sake.”

— Charles Darwin, book On the Origin of Species (1859)

Source: On the Origin of Species (1859), chapter II: "Variation Under Nature", page 52 http://darwin-online.org.uk/content/frameset?pageseq=67&itemID=F373&viewtype=image

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Charles Darwin161

British naturalist, author of "On the origin of species, by… 1809–1882

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