“Gärtner by the results of these transformation experiments, was led to oppose the opinion of those naturalists who dispute the stability of plant species and believe in a continuous evolution of vegetation. He perceives in the complete transformation of one species into another an indubitable proof that species are fixed within limits beyond which they cannot change.
Although this opinion cannot be unconditionally accepted, we find on the other hand in Gartner's experiments a noteworthy confirmation of that supposition regarding variability of cultivated plants which has already been expressed.”

— Gregor Mendel, book Experiments in plant-hybridisation

Concluding paragraph
Experiments in plant-hybridisation (1865)

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Gregor Mendel11

Silesian scientist and Augustinian friar 1822–1884

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“It was in the attempt to ascertain the interrelationships between species that experiments n genetics were first made. The words "evolution" and "origin of species" are now so intimately associated with the name of Darwin that we are apt to forger that the idea of common descent had been prominent in the mnds of naturalists before he wrote, and that, for more than half a century, zealous investigators had been devoting themselves to the experimental study of that possibility. Prominent among this group of experimenters may be mentioned Koelreauter, John Hunter, Herbert Knight, Gartner, Jordan. Naudin, Godron, Lecoq, Wichura--men whose names are familiar to every reader of Animals and Plants unders Domestication.”

William Bateson (1861–1926) British geneticist and biologist

Introductory Chapter, p. 2
Mendel's Principles of Heredity (1913)

“In spite of Darwin's hopes, the acceptance of his views has led to no real improvement — scarcely indeed to any change at all in either the practice or aims of systematists. In a famous passage in the Origin he confidently declares that when his interpretation is generally adopted "Systematists will be able to pursue their labours as at present; but they will not be incessantly haunted by the shadowy doubt whether this or that form be a true species. This, I feel sure, and I speak after experience, will be no slight relief. The endless disputes whether or not some fifty species of British brambles are good species will cease." Those disputes nevertheless proceed almost exactly as before. It is true that biologists in general do not, as formerly, participate in these discussions because they have abandoned systematics altogether; but those who are engaged in the actual work of naming and cataloguing animals and plants usually debate the old questions in the old way. There is still the same divergence of opinion and of practice, some inclining to make much of small differences, others to neglect them. Not only does the work of the sytematists as a whole proceed as if Darwin had never written but their attitude towards these problems is but little changed.”

William Bateson (1861–1926) British geneticist and biologist

Source: Problems In Genetics (1913), p. 10

“Undermining experience, embellishing experience, rearranging and enlarging experience into a species of mythology.”

Philip Roth book The Facts: A Novelist's Autobiography

Opening letter to Nathan Zuckerman.
Referring to the life of a fiction writer
The Facts: A Novelist's Autobiography (1988)

“If species had really arisen by the natural selection for impalpable differences, intermediate forms should abound, and the limits between species should be on the whole indefinite. As this conclusion follows necessarily from the premisses, the selectionists believe and declare that it represents the facts of nature. Difference between species being by axiom indefinite, the differences between varieties must be supposed to be still less definite. Consequently the conclusion that evolution must proceed by insensible transformation of masses of individuals has become an established dogma.”

William Bateson (1861–1926) British geneticist and biologist

Source: Mendel's Principles of Heredity (1913), p. 3

“The principle being accepted that all Species of one Genus have arisen from one mother through different fathers, it must be assumed
# That in the beginning the Creator created of each natural Order only one plant with reproductive power.
# That by their various mixings different plants have arisen which belong to the mother's natural order as they are similar to the mother with regard to their fructifications, and are, as it were, species of the order, i. e., genera.
# We may assume that plants have arisen within the orders, i. e. by genera of one order, may mix with each other. In this was there will arise species that should be referred to the mother's genus as her daughters.”

Carl Linnaeus (1707–1778) Swedish botanist, physician, and zoologist

Praelectiones (Lectures, 1744) quoted in Larson (1967:317)

“The history of most fossil species includes two features particularly inconsistent with gradualism: 1. Stasis. Most species exhibit no directional change during their tenure on earth. They appear in the fossil record looking much the same as when they disappear; morphological change is usually limited and directionless. 2. Sudden appearance. In any local area, a species does not arise gradually by the steady transformation of its ancestors; it appears all at once and “fully formed.””

Stephen Jay Gould book The Panda's Thumb

"The Episodic Nature of Evolutionary Change", p. 182
The Panda's Thumb (1980)

“My observation continues to confirm me more and more in the opinion, that to experience religion is to experience the truth of the great doctrines of Divine grace.”

Ichabod Spencer (1798–1854) American minister

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 163.

“A schoolteacher or professor cannot educate individuals, he educates only species.”

Georg Christoph Lichtenberg (1742–1799) German scientist, satirist

J 10
Aphorisms (1765-1799), Notebook J (1789)

“The evolutionary vision is agnostic in regard to systems in the universe of greater complexity than those of which human beings have clear knowledge. It recognizes aesthetic, moral, and religious ideas and experiences as a species, in this case of mental structures or of images, which clearly interacts with other species in the world's great' ecosystem.”

Kenneth E. Boulding (1910–1993) British-American economist

Source: 1970s, Ecodynamics: A New Theory Of Societal Evolution, 1978, p. 20

“Evolution is a theory of organic change, but it does not imply, as many people assume, that ceaseless flux is the irreducible state of nature and that structure is but a temporary incarnation of the moment. Change is more often a rapid transition between stable states than a continuous transformation at slow and steady rates. We live in a world of structure and legitimate distinction. Species are the units of nature's morphology.”

Stephen Jay Gould book The Panda's Thumb

"A Quahog is a Quahog", p. 213
The Panda's Thumb (1980)

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Gregor Mendel11

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