Project Gutenberg 2001-11-01 Public domain in the USA. 86 Huxley, Thomas Henry 1825 1895 Huxley, T. H. (Thomas Henry) 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" Produced by Amy E. Zelmer, and David Widger "The Conditions of Existence as Affecting the Perpetuation of Living Beings" by Thomas H. Huxley is a scientific lecture delivered in the mid-19th century, specifically in 1863. It serves as the fifth in a series of lectures aimed at working men, discussing the implications of Darwin's "Origin of Species." The book explores the mechanisms of natural selection and variation in living organisms, examining how structural and physiological characteristics evolve and are perpetuated in species. In this lecture, Huxley outlines the processes behind variation within species, emphasizing the role of selective breeding and natural selection in the perpetuation of these variations. He differentiates between structural changes seen in domesticated breeds, such as pigeons and dogs, and the physiological traits that define their behaviors and instincts. Moreover, Huxley argues that natural conditions can create selective pressures akin to those applied by human breeders, leading to further variations in species over time. He also discusses the limitations of these variations, focusing particularly on reproductive processes and the difference between hybrids and mongrels. Ultimately, the lecture explores how the struggle for existence influences the survival and dominance of certain traits within species, supported by various natural and environmental factors. (This is an automatically generated summary.) Reading ease score: 50.2 (10th to 12th grade). Somewhat difficult to read. en Evolution (Biology) Darwin, Charles, 1809-1882. On the origin of species QH Text Category: Science - Biology 73722 2025-07-02T04:45:16.596025 text/html 68551 2013-01-22T14:31:50 text/html 175048 2025-07-02T04:45:22.304998 application/epub+zip 173641 2025-07-02T04:45:20.058017 application/epub+zip 79932 2025-07-02T04:45:18.804059 application/epub+zip 385867 2025-07-02T04:45:23.867034 application/x-mobipocket-ebook 378033 2025-07-02T04:45:21.547055 application/x-mobipocket-ebook 94599 2022-09-02T06:38:30.022392 application/x-mobipocket-ebook 62912 2025-07-02T04:45:16.353062 text/plain; charset=us-ascii 62897 2009-01-04T11:05:10 text/plain; charset=us-ascii 18894 2025-07-02T04:45:24.158012 application/rdf+xml 24951 2025-07-02T04:45:19.306005 image/jpeg 4571 2025-07-02T04:45:19.055021 image/jpeg 69971 2013-01-22T14:32:42 application/octet-stream application/zip 22796 2009-01-04T11:17:14 application/octet-stream application/zip 172486 2025-07-02T04:45:16.606019 application/octet-stream application/zip Archives containing the RDF files for *all* our books can be downloaded at https://book.klll.cc/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog en.wikipedia