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The Conditions of Existence as Affecting the Perpetuation of Living Beings / Lecture V. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species" cover

The Conditions of Existence as Affecting the Perpetuation of Living Beings / Lecture V. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"

The lecturer explains that living beings both tend to reproduce their kind and constantly produce variation, and he distinguishes structural from physiological changes. He argues that artificial selection can generate breeds whose anatomical and behavioral differences rival or exceed those used to define natural species, illustrating this with pigeon and dog varieties. He further examines the limits of selection, noting that while many traits are modifiable, reproductive processes often impose a check: hybrids commonly fail to breed true, so sterility and other reproductive barriers can prevent the formation of new, stable forms by selection alone.

By Thomas Henry Huxley
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Science - Biology

About This Book

The lecturer explains that living beings both tend to reproduce their kind and constantly produce variation, and he distinguishes structural from physiological changes. He argues that artificial selection can generate breeds whose anatomical and behavioral differences rival or exceed those used to define natural species, illustrating this with pigeon and dog varieties. He further examines the limits of selection, noting that while many traits are modifiable, reproductive processes often impose a check: hybrids commonly fail to breed true, so sterility and other reproductive barriers can prevent the formation of new, stable forms by selection alone.

About the Author

Huxley, Thomas Henry portrait

Thomas Henry Huxley

Thomas Henry Huxley (1825-1895) was an English biologist and a prominent advocate of Charles Darwin's theory of evolution. Often referred to as 'Darwin's Bulldog' for his defense of evolutionary science, Huxley made significant contributions to the fields of zoology and paleontology. His works, such as "A Critical Examination of the Position of Mr. Darwin's Work" and "American Addresses, with a Lecture on the Study of Biology," reflect his commitment to scientific inquiry and education. Huxley's writings often explored the relationship between science and religion, and he was instrumental in promoting the importance of scientific literacy in society.

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