“While the geneticists were disproving many of Darwin's ideas, the palaeontologists were determining the actual historical facts of evolution. …they were able to verify the law of succession, first explicitly given by Darwin's colleague Wallace. "Every species has come into existence coincident, both in time and space, with a pre-existing closely allied species."”

— J. B. S. Haldane , book The Causes of Evolution

Introduction, pp.20-21.
The Causes of Evolution (1932)

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J. B. S. Haldane 32

Geneticist and evolutionary biologist 1892–1964

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“Every species has come into existence coincident both in space and time with a pre-existing closely allied species.”

Alfred Russel Wallace (1823–1913) British naturalist, explorer, geographer, anthropologist and biologist

"On the Law which has Regulated the Introduction of New Species" (1855).

“I am a vegetarian because I believe that present-day ethics is founded on that puerile, pre-Darwinian delusion that all other kinds of creatures and all worlds were created explicitly for the hominine species. Vegetarianism is the ethical corollary of evolution. It is simply the expansion of ethics to suit the biological revelations of Charles Darwin. Evolution has taught us the kinship of all creatures.”

J. Howard Moore (1862–1916)

Source: Why I Am a Vegetarian: An Address Delivered before the Chicago Vegetarian Society (1895), pp. 19–20

“There is but one hypothesis regarding the origin of species of animals in general which has any scientific existence—that propounded by Mr. Darwin.”

Thomas Henry Huxley (1825–1895) English biologist and comparative anatomist

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

“The idea that we were designed by our past was the principal insight of Charles Darwin. He was the first to realize that you can abandon divine creation of species without abandoning the argument from design.”

Matt Ridley (1958) economist

Source: The Red Queen (1993), Ch. 1. Human Nature

“Darwinism is still very much alive, utterly dominating biology. Despite the fact that no one has ever been able to prove the creation of a single distinct species by Darwinist means, Darwinism dominates the academy and the media.”

Ben Stein (1944) actor, writer, commentator, lawyer, teacher, humorist

Darwinism: The Imperialism of Biology?, Expelled: No Intelligence Allowed, 31 October 2007, 2008-02-26 http://expelledthemovie.com/blog/page/3/,

“At the core of punctuated equilibria lies an empirical observation: once evolved, species tend to remain remarkably stable, recognizable entities for millions of years. The observation is by no means new, nearly every paleontologist who reviewed Darwin's Origin of Species pointed to his evasion of this salient feature of the fossil record. But stasis was conveniently dropped as a feature of life's history to he reckoned with in evolutionary biology. And stasis had continued to be ignored until Gould and I showed that such stability is a real aspect of life's history which must be confronted-and that, in fact, it posed no fundamental threat to the basic notion of evolution itself. For that was Darwin's problem: to establish the plausibility of the very idea of evolution, Darwin felt that he had to undermine the older (and ultimately biblically based) doctrine of species fixity. Stasis, to Darwin, was an ugly inconvenience.”

Niles Eldredge (1943) American biologist

Time Frames: The Rethinking of Darwinian Evolution and the Theory of Punctuated Equilibria, Simon & Schuster: New York NY, 1985, pp.188-189

“Darwin's theory of evolution by natural selection is the only workable explanation that has ever been proposed for the remarkable fact of our own existence, indeed the existence of all life wherever it may turn up in the universe.”

John Maynard Smith book The Theory of Evolution

Source: The Theory of Evolution (1958), p. xv.

“The idea that certain races (or species) are ‘higher’ or ‘lower’ was not Darwin’s idea but the universal language of all prior naturalists since forever. Darwin acknowledges this, but does not contribute to it, other than to suggest that Caucasians are not the ultimate form of mankind.”

Aron Ra (1962) Aron Ra is an atheist activist and the host of the Ra-Men Podcast

"Darwin’s view of the ‘races’ of men" http://www.patheos.com/blogs/reasonadvocates/2015/01/01/darwins-view-of-the-races-of-men/, Patheos (January 1, 2015)
Patheos

“Darwin believed that the crossing of two types generally led to a blend, and that consequently bisexual reproduction tended to make a species uniform. He therefore had to postulate some cause constantly at work to keep up the inheritable variation within a species. He very naturally looked to the effects of differences of environment. …It was shown that Darwin had been wrong in supposing that variations due to environment were inheritable. Selection merely picked out the best available line from a given population, and would not, as Darwin had believed, give rise to an unlimited amount of change.”

J. B. S. Haldane book The Causes of Evolution

Introduction, pp.14-20.
The Causes of Evolution (1932)

“Mr. Darwin and Mr. Wallace say that the opposite hypothesis, which assumes that every species is capable of varying indefinitely from its original type, is not a whit more arbitrary, and has this manifest claim to be preferred, that it will account for a multitude of phenomena which the ordinary theory is incapable of explaining.”

Charles Lyell (1797–1875) British lawyer and geologist

Source: The Geological Evidences of the Antiquity of Man (1863), Ch.21, p. 411
Context: Every naturalist admits that there is a general tendency in animals and plants to vary; but it is usually taken for granted, though we have no means of proving the assumption to be true, that there are certain limits beyond which each species cannot pass under any circumstances, or in any number of generations. Mr. Darwin and Mr. Wallace say that the opposite hypothesis, which assumes that every species is capable of varying indefinitely from its original type, is not a whit more arbitrary, and has this manifest claim to be preferred, that it will account for a multitude of phenomena which the ordinary theory is incapable of explaining.

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J. B. S. Haldane 32

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