Quotes about species

A collection of quotes on the topic of species.

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Samuel Johnson photo

„Hope is itself a species of happiness, and, perhaps, the chief happiness which this world affords“

—  Samuel Johnson English writer 1709 - 1784

Letter, June 8, 1762 [to an unnamed recipient], p. 103
Vol I
Context: Hope is itself a species of happiness, and, perhaps, the chief happiness which this world affords: but, like all other pleasures immoderately enjoyed, the excesses of hope must be expiated by pain; and expectations improperly indulged must end in disappointment. If it be asked, what is the improper expectation which it is dangerous to indulge, experience will quickly answer, that it is such expectation as is dictated not by reason, but by desire; expectation raised, not by the common occurrences of life, but by the wants of the expectant; an expectation that requires the common course of things to be changed, and the general rules of action to be broken.

Sigourney Weaver photo
Gregor Mendel photo

„The striking-regularity with which the same hybrid forms always reappeared whenever fertilisation took place between the same species induced further experiments to be undertaken“

—  Gregor Mendel, book Experiments in plant-hybridisation

Introductory paragraph
Experiments in plant-hybridisation (1865)
Context: Experience of artificial fertilisation, such as is effected with ornamental plants in order to obtain new variations in colour, has led to the experiments which will here be discussed. The striking-regularity with which the same hybrid forms always reappeared whenever fertilisation took place between the same species induced further experiments to be undertaken, the object of which was to follow up the developments of the hybrids in their progeny.

Elizabeth Kolbert photo
Citát „Here we are, the most clever species ever to have lived. So how is it we can destroy the only planet we have?“
Jane Goodall photo
Hubert Reeves photo
Alexis Karpouzos photo
Thomas Henry Huxley photo
Prince Philip, Duke of Edinburgh photo

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David Hume photo

„Heaven and Hell suppose two distinct species of men, the good and the bad; but the greatest part of mankind float betwixt vice and virtue.“

—  David Hume Scottish philosopher, economist, and historian 1711 - 1776

Essay on the Immortality of the Soul
Context: Heaven and Hell suppose two distinct species of men, the good and the bad; but the greatest part of mankind float betwixt vice and virtue. -- Were one to go round the world with an intention of giving a good supper to the righteous, and a sound drubbing to the wicked, he would frequently be embarrassed in his choice, and would find that the merits and the demerits of most men and women scarcely amount to the value of either.

Hans-Hermann Hoppe photo
Joaquin Phoenix photo
Lee Kuan Yew photo
Henry Fielding photo
Stephen King photo
Sharon Needles photo
Bill Mollison photo
Ronald Fisher photo

„In organisms of all kinds the young are launched upon their careers endowed with a certain amount of biological capital derived from their parents. This varies enormously in amount in different species, but, in all, there has been, before the offspring is able to lead an independent existence, a certain expenditure of nutriment in addition, almost universally, to some expenditure of time or activity, which the parents are induced by their instincts to make for the advantage of their young. Let us consider the reproductive value of these offspring at the moment when this parental expenditure on their behalf has just ceased. If we consider the aggregate of an entire generation of such offspring it is clear that the total reproductive value of the males in this group is exactly equal to the total value of all the females, because each sex must supply half the ancestry of all future generations of the species. From this it follows that the sex ratio will so adjust itself, under the influence of Natural Selection, that the total parental expenditure incurred in respect of children of each sex, shall be equal; for if this were not so and the total expenditure incurred in producing males, for instance, were less than the total expenditure incurred in producing females, then since the total reproductive value of the males is equal to that of the females, it would follow that those parents, the innate tendencies of which caused them to produce males in excess, would, for the same expenditure, produce a greater amount of reproductive value; and in consequence would be the progenitors of a larger fraction of future generations than would parents having a congenital bias towards the production of females. Selection would thus raise the sex-ratio until the expenditure upon males became equal to that upon females.“

—  Ronald Fisher, book The Genetical Theory of Natural Selection

On natural selection acting on sex ratio: Fisher's principle, Ch. 6, p. 141.
The Genetical Theory of Natural Selection (1930)

Fidel Castro photo

„I would dare say that today this species is facing a very real and true danger of extinction, and no one can be sure, listen to this well, no one can be sure that it will survive this danger.“

—  Fidel Castro former First Secretary of the Communist Party and President of Cuba 1926 - 2016

University of Havana address (2005)
Context: I would dare say that today this species is facing a very real and true danger of extinction, and no one can be sure, listen to this well, no one can be sure that it will survive this danger.
Well, the fact that the species would not survive was discussed about 2,000 years ago. I remember that when I was a student I heard of the Apocalypse, a book of prophesy in the Bible. Apparently, 2000 years ago someone realized that this weak species could one day disappear.

„Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam egestas wisi a erat. Morbi imperdiet, mauris ac auctor dictum.“