“Every species has come into existence coincident both in space and time with a pre-existing closely allied species.”
"On the Law which has Regulated the Introduction of New Species" (1855).
Help us to complete the source, original and additional information
Alfred Russel Wallace 12
British naturalist, explorer, geographer, anthropologist an… 1823–1913Related quotes

The Varieties of Scientific Experience: A Personal View of the Search for God (2006)

1860s, On a Piece of Chalk (1868)

Source: Better-World Philosophy: A Sociological Synthesis (1899), Egoism and Altruism, pp. 120–121

F 84
Aphorisms (1765-1799), Notebook F (1776-1779)

Gause 1934
[Foraging habitat partitioning in Roseate and Common Terns, The Auk, 107, 2, April 1990, 351–358, 10.2307/4087619, https://www.jstor.org/stable/4087619]

Source: 1860s, Evidence as to Man's Place in Nature (1863), Ch.2, p. 125

Twitter https://twitter.com/marwilliamson (8 Jan 20)
Williamson's quotes in social media

Source: "Toward a universal law of generalization for psychological science," 1987, p. 1319