WorkHerbert Spencer

The Factors of Organic Evolution

Two magazine essays defending the one part of his evolutionism biology was about to destroy — and the ground he then fought August Weismann over.

by Herbert Spencer82 passages held

English, the original language, and your language

First published: 1886(aged 66)
Original language: English

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Overview

Everything else he had written rested on one assumption about heredity, and in 1886 he set out to defend it. Two essays in The Nineteenth Century, for April and May, argued that natural selection could not do the work being asked of it — and by then, for most people who accepted evolution at all, natural selection was the whole of the mechanism. His objection is a practical one about parts that must change together. Alter the length of a limb bone and the muscles, tendons, nerves and blood supply serving it must alter to match, all at once, or the animal is worse off than before; selection working on separate chance variations has no way of assembling that co-adaptation, and the more complex the creature the worse the difficulty becomes. Something else must be at work, and Spencer's candidate was the one Lamarck had proposed: the effects of use and disuse, acquired in a lifetime, passed on. He collected the essays as a short book and said plainly what was riding on it. If acquired modifications are not transmitted, then his account of mind as the deposited experience of ancestors, and his account of societies adapting to the demands of living together, both lose their engine — which is why the man who gave the age the phrase survival of the fittest spent his last decade arguing that survival of the fittest was not enough. Meanwhile August Weismann was cutting the ground away. His germ-plasm theory held the reproductive material to be sealed off from the body carrying it, so that nothing the body acquires can reach the next generation. The two of them fought it out in the Contemporary Review through 1893 and 1894, Spencer answering and rejoining four times. Biology went with Weismann.

Key concepts

What counts as an acquired modification for Spencer?

An acquired modification is a change produced during an organism’s own lifetime by use, disuse, or changed conditions, rather than a variation present at birth. Spencer’s argument depends on such changes becoming hereditary: otherwise an individual’s adaptation ends with that individual. The distinction lets him treat lived adjustment as an evolutionary cause, not merely a personal effect.

Why does Spencer make heredity central to psychology and sociology?

He makes heredity central because inherited adaptations carry ancestral experience into later minds and societies. His psychology treats mental capacities as accumulated effects of earlier generations, while his sociology treats social arrangements as responses shaped across time. If acquired changes cannot be transmitted, both accounts lose the process that connects individual adjustment with long-term development.

What does Weismann’s germ-plasm theory rule out?

Weismann’s germ-plasm theory rules out the inheritance of changes acquired by the body during its lifetime. It separates reproductive material from the organism that carries it, so exercise, disuse, or altered conditions cannot modify what passes to offspring. Spencer fought this position in four replies published across 1893 and 1894, but biology adopted Weismann’s side.

Why was survival of the fittest insufficient for Spencer?

For Spencer, survival of the fittest could preserve useful variations but could not by itself explain how coordinated changes arise in complex organisms. His earlier phrase therefore failed to name the whole evolutionary mechanism he required. In 1886 he defended heredity through acquired modification because his psychology and sociology depended on more than differential survival.

How does Spencer connect individual adaptation with social progress?

Spencer connects them by treating social development as adaptation to the demands of living together, not as a separate historical process. Changes made in response to conditions must persist and accumulate before they can shape collective life across generations. The same hereditary mechanism therefore supports his biological account and his explanations of civilization, morality, and social organization.

Themes of the book

What this book returns to, gathered into themes and ordered by how much of the text each one occupies.

The Missing Mechanism in Natural Selection

Can chance variations assemble the interdependent changes that complex organisms require, or must inheritance carry the effects of use and disuse? The answer decides more than a biological theory: it supports or threatens Spencer’s accounts of mind and social evolution.

In two 1886 essays, Spencer argued that natural selection could not assemble co-adapted parts such as bones, muscles, nerves and blood vessels, because each had to change together. He revived Lamarck’s claim that acquired modifications pass to descendants, making inheritance the causal engine of adaptation, psychology and sociology. August Weismann opposed him through four exchanges in 1893 and 1894, arguing that germ plasm remained insulated from the body. Biology followed Weismann.

adaptation
natural selection
evolutionary theory
inheritance
use and disuse

Enter a dialogue

Within this work

passages held: 82
distinct concepts: 243
by passages held, corpus-wide: #196

What this book thinks together

Every arc around the wheel is one concept in this book. A ribbon joins two the text reaches for together, and its width is how many of its passages hold both. Strongest: adaptation with social evolution.

Concept co-occurrence, strongest first 8 concepts, joined by 6 pairings. 16 shared passages in all. 16 weaker pairings reach beyond these concepts and are not drawn.
Concept	Paired concept	Shared passages
adaptation	social evolution	5
climate	social evolution	3
climate	demography	2
environmental determinism	social evolution	2
environmental determinism	sociology	2
social evolution	sociology	2

Works held

The author's work in order, this book marked in place. Your-language title first, the original beneath it where the two differ; side chips show which full texts are held.

1850 The Right to Ignore the State
Nowhere else did his individualism go so far in print. A chapter rather than a book — which is why it now travels without the treatise that produced it.
EN
1851 Social Statics
His first book fixed the political position he defended for the next half-century, and the evolutionary reasoning he tried out here on the poor law grew into a philosophy of the universe.
EN
1852 The Philosophy of Style
It sits between his first book and the psychology that broke his health, and it is a single essay of October 1852, printed in a quarterly.
EN
1855 The Principles of Psychology
Fifteen years on it returned, much enlarged, as a volume of the Synthetic Philosophy — so the edition that carried his psychology to readers is not the one that broke him.
EN
1858 Essays: Scientific, Political and Speculative
Read against the Synthetic Philosophy, this is where several of its positions were first stated at magazine length — and where he wrote about music, manners and laughter, which the system had no room for.
EN
1861 Essays on Education and Kindred Subjects
The essays are of the 1850s; the book is of 1911, and Charles W. Eliot, not Spencer, chose its contents — the four on education, set beside pieces on progress, science, manners, laughter and music.
EN
1862 First Principles
Everything else in the Synthetic Philosophy was written to demonstrate the formula set out here, and every later volume argues back to it. Spencer issued it first, when none of what it was meant to govern had yet been written.
EN
1864 Illustrations of Universal Progress: A Series of Discussions
Assembled for America out of the same magazine pieces Spencer was collecting at home in his own Essays, with which it overlaps heavily. It was often the first Spencer an American reader owned.
EN
1873 The Study of Sociology
It stands in front of the three volumes of the sociology as their introduction, arguing that the science is difficult before any of it was attempted. Much the shortest of his sociological writing.
EN
1876 The Principles of Sociology
Three volumes over twenty years, resting on an apparatus Spencer had to build and pay for before he could write them: the Descriptive Sociology tables, which he abandoned before the last volume appeared.
EN
1879 The Data of Ethics
Ethics was where the whole system was meant to arrive, and this is its opening division — issued alone, ahead of the volumes it was supposed to rest on, and later bound in as Part I of The Principles of Ethics.
EN
1886 The Factors of Organic Evolution you are here EN

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