On the Origin of Species By Means of Natural Selection / Or, the Preservation of Favoured Races in the Struggle for Life

Metadata

Gutenberg ID

1228

Title

On the Origin of Species By Means of Natural Selection / Or, the Preservation of Favoured Races in the Struggle for Life

Language

en

Book source

Project Gutenberg

Description max 80 words

Charles Darwin presents his groundbreaking theory of evolution by natural selection, arguing that species evolve through a struggle for existence and the preservation of favored traits. This seminal work challenges the notion of immutable species, offering a scientific explanation for the diversity of life based on descent with modification and the cumulative power of selection.

Summary up to 500 words

In *On the Origin of Species*, Charles Darwin presents a comprehensive argument for the evolution of life through natural selection. He begins by examining variation under domestication, demonstrating how human selection can drastically alter breeds of animals and plants over time. Darwin posits that nature operates similarly through a 'struggle for existence,' where individuals with advantageous variations are more likely to survive and reproduce. He addresses significant difficulties, such as the lack of transitional fossils and the apparent perfection of certain organs, arguing that the geological record is imperfect and that nature does not create perfect forms instantly. Darwin explores the roles of instinct, hybridism, and geographical distribution, showing how isolation and barriers lead to the divergence of species. He emphasizes that all organic beings are connected by a single thread of life, with lower forms changing more slowly than higher ones. The book concludes by recapitulating the evidence supporting descent with modification, asserting that natural selection is the primary mechanism driving the adaptation and diversification of life on Earth, fundamentally reshaping the understanding of natural history. Darwin explains that events in the material world are governed by general laws rather than insulated interpositions of divine power. He details how the power of selection, whether methodical or unconscious, accumulates slight variations over vast periods to produce the complex adaptations seen in nature. He illustrates this with examples from domestic pigeons and cultivated plants, noting that man's selection relies on nature's initial provision of slight deviations. Furthermore, Darwin discusses the importance of geographical barriers and the history of climate changes in shaping the distribution of species. He argues that the inhabitants of oceanic islands are related to those of the nearest mainland, having colonized from there and subsequently modified to fit their new homes. By considering the wide distribution of certain genera and the slow rate of change in lower organisms, Darwin shows how migration and subsequent modification explain the affinities between species across vast distances and deep time. Ultimately, the work establishes that the unity of type and the conditions of existence are best explained by the theory of descent with modification, providing a coherent framework for understanding the diversity of life.

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Categories

• Science
• Biology