“The supporters of the Development Hypothesis… can show that any existing species—animal or vegetable—when placed under conditions different from its previous ones, immediately begins to undergo certain changes fitting it for the new conditions.”

— Herbert Spencer

They can show that in successive generations these changes continue; until, ultimately, the new conditions become the natural ones. They can show that in cultivated plants, in domesticated animals, and in the several races of men, such alterations have taken place. They can show that the degrees of difference so produced are often, as in dogs, greater than those on which distinctions of species are in other cases founded.
The Development Hypothesis (1852)

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Herbert Spencer 81

English philosopher, biologist, sociologist, and prominent … 1820–1903

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“The supporters of the Development Hypothesis… can show that any existing species—animal or vegetable—when placed under conditions different from its previous ones, immediately begins to undergo certain changes fitting it for the new conditions. They can show that in successive generations these changes continue; until, ultimately, the new conditions become the natural ones.”

Herbert Spencer (1820–1903) English philosopher, biologist, sociologist, and prominent classical liberal political theorist

The Development Hypothesis (1852)
Context: The supporters of the Development Hypothesis... can show that any existing species—animal or vegetable—when placed under conditions different from its previous ones, immediately begins to undergo certain changes fitting it for the new conditions. They can show that in successive generations these changes continue; until, ultimately, the new conditions become the natural ones. They can show that in cultivated plants, in domesticated animals, and in the several races of men, such alterations have taken place. They can show that the degrees of difference so produced are often, as in dogs, greater than those on which distinctions of species are in other cases founded.

“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

“One type of medical research involves ascertaining whether certain pathological conditions in humans can be alleviated or cured by certain drugs. Animals are used as "models" upon which to test these treatments. To do this it is necessary for the animal subject to have the condition in question, and in order to bring this about healthy animals are made sick. … It turns out, however, that the conditions artificially induced have little in common with the naturally occurring diseases in animals (when these exist) and much less in common with the diseases in man.”

Deborah Mayo American philosopher

Source: Against a Scientific Justification of Animal Experiments, pp. 343-344

“So far are they from displaying any overweening love of freedom that they show a singular contentment with a condition of servitorship, often showing a curious canine pride in it, and again often simply unaware that they are existing in that condition.”

Albert Jay Nock (1870–1945) American journalist

Source: Memoirs of a Superfluous Man (1943), p. 314
Context: According to my observations, mankind are among the most easily tamable and domesticable of all creatures in the animal world. They are readily reducible to submission, so readily conditionable (to coin a word) as to exhibit an almost incredibly enduring patience under restraint and oppression of the most flagrant character. So far are they from displaying any overweening love of freedom that they show a singular contentment with a condition of servitorship, often showing a curious canine pride in it, and again often simply unaware that they are existing in that condition.