An Essay on the Principle of Population

An Essay on the Principle of Population was first published anonymously in 1798. The author was soon identified as the Reverend Thomas Robert Malthus.

Whilst not the first book on population, it is acknowledged as the most influential.

One impact of Malthus's book was that it fuelled the debate about the size of the population in Britain and led to (or at least greatly accelerated) the passing of the Census Act 1800. This Act enabled the holding of a national census in England, Wales and Scotland, starting in 1801 and continuing every ten years to the present.

1st edition

The full title of the 1st edition of Malthus' essay was "An Essay on the Principle of Population, as it affects the Future Improvement of Society with remarks on the Speculations of Mr. Godwin, M. Condorcet, and Other Writers."

William Godwin had published his utopian work Enquiry concerning Political Justice in 1793, with later editions in 1796 and 1798. Also, Of Avarice and Profusion (1797). Malthus' remarks on Godwin's work spans chapters 10 through 15 (inclusive) out of nineteen. Godwin responded with Of Population (1820).

The Marquis de Condorcet had published his utopian vision of social progress and the perfectibility of man Esquisse d'un Tableau Historique des Progres de l'Espirit Humain (The Future Progress of the Human Mind) in 1794. Malthus' remarks on Condorcet's work spans chapters 8 and 9.

Malthus' essay was in response to these utopian visions, as he argued:

"This natural inequality of the two powers, of population, and of production of the earth, and that great law of our nature which must constantly keep their effects equal, form the great difficultly that appears to me insurmountable in the way to the perfectibility of society."

"Other writers" included Robert Wallace, Adam Smith, Richard Price, and David Hume.

Malthus himself claimed:

"The only authors from whose writings I had deduced the principle, which formed the main argument of the Essay, were Hume, Wallace, Adam Smith, and Dr. Price ..."

Chapters 1 and 2 outline Malthus' Principle of Population, and the unequal nature of food supply to population growth. The exponential nature of population growth is today known as the Malthusian growth model. This aspect of Malthus' Principle of Population, together with his assertion that food supply was subject to an linear growth model, would remain unchanged in future editions of his essay. Note that Malthus actually used the terms geometric and arithmetic, respectively.

Chapter 3 examines the overrun of the Roman empire by barbarians, due to population pressure. War as a check on population is examined.

Chapter 4 examines the current state of populousness of civilized nations (particularly Europe). Malthus criticises David Hume for a "probable error" in his "criterions that he proposes as assisting in an estimate of population."

The poor laws of Pitt the Younger are examined in chapter 5.

Chapter 6 examines the rapid growth of new colonies such as the former Thirteen Colonies of the United States of America.

Chapter 7 examines checks on population such as pestilence and famine.

Chapter 8 also examines a "probable error" by Wallace "that the difficulty arising from population is at a great distance."

Chapters 16 and 17 examine the causes of the wealth of states, including criticisms of Adam Smith and Richard Price. English wealth is compared with Chinese poverty.

Chapters 18 and 19 are largely works of natural theology.

The 1st edition influenced writers of natural theology such as William Paley and Thomas Chalmers.

2nd to 6th editions

Following both widespread praise and criticism of his essay, Malthus revised his arguments and recognised other influences:

"In the course of this inquiry I found that much more had been done than I had been aware of, when I first published the Essay. The poverty and misery arising from a too rapid increase of population had been distinctly seen, and the most violent remedies proposed, so long ago as the times of Plato and Aristotle. And of late years the subject has been treated in such a manner by some of the French Economists; occasionally by Montesquieu, and, among our own writers, by Dr. Franklin, Sir James Stewart, Mr. Arthur Young, and Mr. Townsend, as to create a natural surprise that it had not excited more of the public attention."

The 2nd edition, published in 1803 (with Malthus now clearly identified as the author), was entitled "An Essay on the Principle of Population; or, a View of its Past and Present Effects on Human Happiness; with an enquiry into our Prospects respecting the Future Removal or Mitigation of the Evils which it occasions."

Malthus advised that the 2nd edition "may be considered as a new work", and essentially the subsequent editions were all minor revisions of the 2nd edition. These were published in 1806, 1807, 1817, and 1826.

By far the biggest change was in how the 2nd to 6th editions of the essay were structured, and the most copious and detailed evidence that Malthus presented, more than any previous such book on population. Essentially, for the first time, Malthus examined his own Principle of Population on a region by region basis of world population. With typical 19th century British cultural bias, the essay was organised in four books:

Book I - Of the Checks to Population in the Less Civilized Parts of the World and in Past Times.
Book II - Of the Checks To Population in the Different States of Modern Europe.
Book III - Of the different Systems or Expedients which have been proposed or have prevailed in Society, as They affect the Evils arising from the Principle of Population.
Book IV - Of our future Prospects respecting the Removal or Mitigation of the Evils arising from the Principle of Population.

Due in part to the highly influential nature of Malthus' work (see Main article: Malthus), this approach is regarded as pivotal in establishing the field of demography.

From the 2nd edition onwards - in Book IV - Malthus advocated moral restraint as an additional, and voluntary, check on population. This included such measures as sexual abstinence and late marriage.

Ecologist Professor Garrett Hardin echoes 19th century criticisms of Malthus' hardness of heart in what he termed The Feast of Malthus in the magazine The Social Contract (1998). The offending passage of Malthus' essay appeared in the 2nd edition only, as Malthus felt obliged to remove it.

As noted by Professor Robert M. Young, Malthus dropped his chapters on natural theology from the 2nd edition onwards. Also, the essay became less of a personal response to William Godwin and Marquis de Condorcet.

The 6th edition is the version of the essay that independently influenced both Charles Darwin and Alfred Russel Wallace, co-founders of the theory of evolution.

A summary view

A Summary View on the Principle of Population was published in 1830. The author was identified as Rev. T.R.Malthus, A.M., F.R.S.. Malthus wrote A Summary View for those who did not have the leisure to read the full essay and, as he put it:

"...to correct some of the misrepresentations which have gone abroad respecting two or three of the most important points of the Essay..."

A Summary View ends with a defence of the Principle of Population against the charge that it:

"...impeaches the goodness of the Deity, and is inconsistent with the letter and spirit of the scriptures."

See main article Malthus for more.

This was Malthus' final word on his Principle of Population. He died in 1834.

Other Works that influenced Malthus

Of the Populousness of Ancient Nations (1752) - David Hume (1711-76)
An inquiry into the Nature and Causes of the Wealth of Nations (1776) - Adam Smith (1723-90)
A Dissertation on the Numbers of Mankind in Ancient and Modern Times (1753), Characteristics of the Present State of Great Britain (1758), and Various Prospects of Mankind, Nature and Providence (1761) - Robert Wallace (1697-1771)
Essay on the Population of England from the Revolution to Present Time (1780), Evidence for a Future Period in the State of Mankind, with the Means and Duty of Promoting it (1787) - Richard Price (1723-1791).
Observations concerning the Increase of Mankind, peopling of Countries, etc. (1751) by Benjamin Franklin (1706-1790)

References

An Essay On The Principle Of Population (1798 1st edition) with A Summary View (1830), and Introduction by Professor Anthony Flew. Penguin Classics. ISBN 0-14-043206
An Essay On The Principle Of Population (1798 1st edition, plus excerpts 1803 2nd edition), Introduction by Philip Appleman, and assorted commentary on Malthus edited by Appleman. Norton Critical Editions. ISBN 0-393-09202-X
Malthus, Founder of Modern Demography (1979, 1999) William Peterson. ISBN 0-7658-0481-6
Online chapter MALTHUS AND THE EVOLUTIONISTS: THE COMMON CONTEXT OF BIOLOGICAL AND SOCIAL THEORY from Darwin's Metaphor: Nature's Place in Victorian Culture by Professor Robert M. Young (1985, 1988, 1994). Cambridge University Press.

External links

An Essay on the Principle of Population, 1st edition, 1798. Library of Economics and Liberty. Free online, full-text searchable.
An Essay on the Principle of Population, 6th edition, 1826. Library of Economics and Liberty. Free online, full-text searchable. Malthus published a major revision to his first edition--his second edition--in 1803. His 6th edition, published 1826, and revising his various 2nd-5th editions, became his widely-cited 6th and final revision.

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