ArticleslgStudy

engineering

Leonard Darwin

Leonard Darwin is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Leonard Darwin rather than just read about it. In short: Leonard Darwin (15 January 1850 – 26 March 1943) was an English politician, economist and eugenicist. He was a son of the naturalist Charles Darwin, and also a mentor to Ronald Fisher, a statistician and evolutionary biologist.

Leonard Darwin — main illustration
Leonard Darwin — illustration

Key takeaways

  • Leonard Darwin belongs to engineering; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Leonard Darwin to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Leonard Darwin from memory before moving on to harder problems.

Reference excerpt

Leonard Darwin (15 January 1850 – 26 March 1943) was an English politician, economist and eugenicist. He was a son of the naturalist Charles Darwin, and also a mentor to Ronald Fisher, a statistician and evolutionary biologist.

Biography Leonard Darwin was born in 1850 at Down House, Kent, into the wealthy Darwin–Wedgwood family. He was the fourth son and eighth child of the naturalist Charles Darwin and his wife Emma Wedgwood, and the last of Darwin's immediate offspring to die. He considered himself the least intelligent of their children – brothers Frank, George and Horace were all elected Fellows of the Royal Society. He was sent to Clapham School in 1862. Darwin joined the Royal Engineers in 1871. Between 1877 and 1882 he worked for the Intelligence Division of the Ministry of War. He went on several scientific expeditions, including those to observe the Transit of Venus in 1874 and 1882. In 1890, Darwin was promoted to the rank of major, but soon left the army and from 1892 to 1895 was a Liberal Unionist Member of Parliament (MP) for Lichfield constituency in Staffordshire, where his grandfather, Josiah Wedgwood II, had also been an MP. He wrote vigorously on the economic issues of the day: bimetallism, Indian currency reform and municipal trade. Darwin married Elizabeth Frances Fraser on 11 July 1882. She died 16 years later, on 13 January 1898. On 29 November 1900, he married his second cousin, Charlotte Mildred Massingberd, granddaughter of Charlotte Wedgwood, his mother's sister. Their shared ancestor was Josiah Wedgwood II. His wife Charlotte's paternal grandfather married his paternal aunt, after her grandmother Charlotte's death. Since Leonard's parents were cousins, Charlotte was also a second cousin on his father's side. Leonard had no children from either marriage. He was president of the Royal Geographical Society from 1908 to 1911 and chairman of the British Eugenics Society from 1911 to 1928 – succeeding his half-cousin once removed Francis Galton. He became the society's honorary president in 1928. In 1912 the University of Cambridge conferred on him an honorary doctorate of science. Darwin played an important part in the life of the geneticist and statistician Ronald Fisher, supporting him intellectually, morally and sometimes financially. Fisher, replying to Darwin's congratulations on his election to the Royal Society, replied on 25 February 1929, "I knew you would be glad, and your pleasure is as good to me almost as though my own father were still living." Some years before, Fisher had resigned from the Royal Statistical Society after a disagreement. Darwin regretted this and engineered Fisher's re-entry by making him a gift of a life-time subscription. Fisher's 1930 book The Genetical Theory of Natural Selection is dedicated to Darwin. After Darwin's death in 1943 at the age of 93, Fisher wrote to Darwin's niece, Margaret Keynes, "My very dear friend Leonard Darwin... was surely the kindest and wisest man I ever knew." Darwin retired to Cripps Corner at Forest Row, East Sussex in 1921, with his second wife Charlotte Mildred Massingberd (died 1940), and lived there until his death in 1943. He and Charlotte were buried at Forest Row Cemetery. Leonard Darwin was the last surviving child of Charles Darwin.

In popular culture Darwin was portrayed by Derek Ensor in the 1985 Central Television serial The Last Place on Earth, in his capacity as President of the RGS at the beginning of the Terra Nova Expedition.

Publications

The Need for Eugenic Reform. London: Murray. 1926. What is Eugenics. London: Watts & Co. 1928.

References

Bibliography W. F. Edwards: "Darwin, Leonard", Oxford Dictionary of National Biography (Oxford, UK:Oxford University Press), 2004. Pay-walled Leonard Darwin, Monthly Notices of the Royal Astronomical Society, 04/01/1944, Vol. 104 (2), pp. 89–90 Serpente, Norberto (August 2016). "More than a Mentor: Leonard Darwin's Contribution to the Assimilation of Mendelism into Eugenics and Darwinism". Journal of the History of Biology. 49 (3): 461–494. doi:10.1007/s10739-015-9423-6. PMID 26391791. R. A. Fisher, J. H. Bennet and L. Darwin, Natural Selection, Heredity and Eugenics: Including Selected Correspondence of R. A. Fisher with Leonard Darwin and Others (Oxford, UK: Clarendon Press), 1983 Leonard Darwin, The Need for Eugenic Reform (London, UK: John Murray), 1926

External links

Leonard Darwin at Find a Grave Works by or about Leonard Darwin at the Internet Archive

Illustrations

Leonard Darwin illustration

Worked examples

Example 1 — a first encounter with Leonard Darwin

Start with the simplest possible case. Write down what Leonard Darwin claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Leonard Darwin before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Leonard Darwin ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Leonard Darwin

In research
Leonard Darwin appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Leonard Darwin in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Leonard Darwin is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1850 births, 1943 deaths, 19th-century British Army personnel, so understanding it makes those chapters shorter.
In everyday life
Look for Leonard Darwin outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Leonard Darwin in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Leonard Darwin means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Leonard Darwin out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Leonard Darwin in simple terms?

Leonard Darwin (15 January 1850 – 26 March 1943) was an English politician, economist and eugenicist. He was a son of the naturalist Charles Darwin, and also a mentor to Ronald Fisher, a statistician and evolutionary biologist.

Why does Leonard Darwin matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Leonard Darwin?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Leonard Darwin.

Tags

  • 1850 births
  • 1943 deaths
  • 19th-century British Army personnel
  • Burials in East Sussex
  • Darwin–Wedgwood family
  • English eugenicists
  • Liberal Unionist Party MPs for English constituencies
  • Military personnel from the London Borough of Bromley
  • People from Downe
  • People from Forest Row
  • Presidents of the Royal Geographical Society
  • Royal Engineers officers

Keep exploring