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Mary Somerville

Mary Somerville

Lived 1780 – 1872.

Mary Somerville was a self-taught mathematician and polymath. Today she might be described as a popularizer of science.

But she was more than a popularizer: her acclaimed translation from French to English of Pierre Laplace’s groundbreaking book on celestial mechanics, with her own additions, became a standard university textbook. Her book On the Connexion of the Physical Sciences became one of the best-selling science books of the nineteenth century, highlighting the underlying unity of scientific disciplines.

The word scientist was first used in 1834 in a review of Connexion. The reviewer, William Whewell, was conscious that people working in scientific disciplines needed a more specific word than ‘philosopher’ to describe them: he coined ‘scientist’ by analogy with ‘artist’ and ‘economist.’

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Beginnings

Mary Fairfax was born on December 26, 1780 in the small town of Jedburgh, Scotland, UK. Somerville was her married surname.

Mary’s father, William George Fairfax, had joined the British Navy at age 10. With distinguished service in battle, he eventually rose to the rank of vice-admiral. Mary’s mother was Janet Margaret Charters, daughter of an eminent solicitor. The couple had seven children, three of whom died in infancy. Mary was the second oldest of the survivors.

The family moved to the small coastal town of Burntisland, about 9 miles from the city of Edinburgh – 9 miles of tidal river crossed by ferry. The family lived simply, keeping livestock and growing fruit, vegetables, and flowers – Mary’s father was not yet a senior officer and his pay was modest. Despite this, they could afford a cook, maid, and gardener.

Mary Fairfax had a carefree, if rather lonely childhood living on the coast. She loved wild birds and would feed them crumbs in winter when there was snow on the ground.

Education

Mary learned to read the Bible with her mother’s help, and at age seven began helping with the livestock and vegetables. Her memory for words was poor and she did not enjoy learning the Catechisms – a series of religious questions and answers – for the Church of Scotland. Their minister was a strict Calvinist, and Mary found him too gloomy.

When Mary was 10, her father returned from a long voyage to discover that although Mary could read, she could not write. He sent her to a boarding school on the other side of the river in Musselburgh, near Edinburgh. She hated her loss of freedom, and although her fellow pupils were kind to her, she was often tearful with homesickness.

She returned home after a year, still unable to write or spell adequately. She spent hours roaming the countryside and beaches observing the wildlife. In the evenings she read Shakespeare. After some lessons with a local teacher she became absorbed in astronomy, observing the night sky, and the northern lights.

Let’s Get Serious

In 1794, at age 13, Mary received formal school lessons in Edinburgh – she learned arithmetic and how to write properly. She began applying herself more intently to learning.

In Burntisland she started teaching herself Latin. For the most part she kept quiet about this – one of her aunts had told her in no uncertain terms to stop reading Shakespeare and spend her time on needlework. However, Mary told her uncle, Thomas Somerville, about her studies. He was delighted and started giving her Latin lessons every day before breakfast.

Mary Somerville’s Lifetime in Context

Mary Somerville's lifetime and the lifetimes of related scientists and mathematicians.

Mary Somerville’s lifetime and the lifetimes of related scientists and mathematicians.

Mathematics

A friend of Mary’s mother gave Mary a fashion magazine. On its final page Mary saw a puzzle featuring numbers mixed with letters – her first encounter with algebra. Strangely intrigued, she tried to find out more, but nobody she knew could help.

At that time, Mary was teaching herself Greek. She had learned the Ancient Greeks were brilliant at geometry, and the greatest book on the subject was Euclid’s Elements. She asked one of her brother’s tutors to buy her books about algebra and geometry in Edinburgh, which he did. She was pleased to see one of the books was Euclid’s Elements.

By day, she was now spending her time learning the socially desirable skills of painting, dancing, and playing piano. She went further, learning cookery and how to tune a piano. By night she studied mathematics, which her father feared could drive her mad:

“I sat up very late reading Euclid. The servants, however, told my mother… whereupon an order was given to take away my candle as soon as I was in bed. I had, however, already gone through the first six books of Euclid, and now I was thrown on my memory, which I exercised by beginning at the first book, and demonstrating in my mind a certain number of problems every night, till I could nearly go through the whole. My father came home for a short time, and, somehow or other, finding out what I was about, said to my mother, “Peg, we must put a stop to this, or we shall have Mary in a strait jacket one of these days.”
Mary Somerville
Personal Recollections, Published 1874
 

The removal of candles is reminiscent of Sophie Germain’s experience in Paris in the same era when she tried to learn mathematics.

“I was intensely ambitious to excel in something, for I felt in my own breast that women were capable of taking a higher place in creation than that assigned to them in my early days, which was very low.”

Mary Somerville
Personal Recollections, Published 1874
 

In 1797, when Mary was 17, her family’s social status rose markedly when her father was knighted by the king and promoted to colonel of marines after he served with distinction in a celebrated British naval victory over the Dutch fleet.

Marriage, Motherhood, and Mathematics

In 1804, age 23, Mary married her cousin Samuel Greig, the Russian consul for Britain. She moved to his home in London. There she continued studying mathematics independently and also learned French. In 1807, Samuel died.

Mary returned to Burntisland with two children. She was financially independent with an inheritance from Samuel. Rising very early each day before her children awoke, she felt ready to tackle “the big one” – Isaac Newton’s Principia.

“I think it was immediately after my return to Scotland that I attempted to read Newton’s Principia. I found it extremely difficult, and certainly did not understand it till I returned to it some time after.”

Mary Somerville
Personal Recollections, Published 1874
 

When she returned to Principia, she studied the Jesuit Edition. This version contained notes and comments longer than Newton’s original text, helping her to understand fully the challenging masterpiece second time around.

Mathematician and Marriage

Mary began exchanging mathematics problems and solutions by letter with William Wallace, also self-taught in mathematics. Wallace was editor of a mathematical journal and later became Professor of Mathematics at the University of Edinburgh.

In 1811, age 30, she was awarded a silver medal for her solution to a Diophantine mathematical problem.

Wallace was a brilliant if relatively unknown mathematician – one of the best in the world at the time. He directed Mary towards the style of mathematics pioneered in continental Europe, which had diverged from the British school. Mathematicians such as Leonhard Euler and Joseph Lagrange had made enormous progress using analysis – a purely algebraic approach to calculus. Lagrange was proud that his great work of 1788, Analytical Mechanics, did not feature a single diagram – it was pure analysis.

In 1812, age 31, Mary married her cousin Dr. William Somerville, a medical man, Inspector of the Army Medical Board. William had spent most of his life overseas and was deeply interested in the natural world. On marriage, Mary took the name Mary Fairfax Somerville.

In 1814, age 33, Mary told William Wallace she wanted to learn cutting-edge mathematics. Wallace recommended a selection of appropriate books to her. It was fortunate she had learned French, because all the books were in French, authored by mathematicians such as Pierre Laplace, Joseph Lagrange, and Siméon Poisson.

Although she was now financially independent, some members of her own family continued to discourage her mathematical studies. Her husband, on the other hand, was fully supportive, and would visit libraries on her behalf to seek out the books and papers his busy wife had requested.

Amid a sometimes hectic daily schedule, Mary always found time for her children. Her daughter Martha recalled:

“When my sister and I were small children, although busily engaged in writing for the press, she used to teach us for three hours every morning.”

The Works of Mary Somerville

In 1819, Mary’s husband began working at London’s Chelsea Hospital and the couple moved to London with their children. Mary continued her mathematics, and in the style Newton, Euler, Lagrange, and Laplace, she applied her mathematics to physical science.

She became Ada Lovelace’s tutor and friend.

In 1826, age 45, Mary published her first scientific paper in Proceedings of the Royal Society: The magnetic properties of the violet rays of the solar spectrum.

The Mechanism of the Heavens

In 1831, age 50, Mary published her glorious The Mechanism of the Heavens. This was her translation of the first two volumes of Pierre Laplace’s Mécanique Céleste. Laplace was a difficult author of whom the mathematician W. W. Rouse Ball wrote:

“Laplace on the other hand explains nothing, is indifferent to style, and, if satisfied that his results are correct, is content to leave them either with no proof or with a faulty one.”

“Diagrams are not employed in Laplace’s works, being unnecessary to those versed in analysis; some, however, will be occasionally introduced [in my translation] for the convenience of the reader.”

Mary Somerville
Introduction to The Mechanism of the Heavens, 1831
 

Mary enhanced, explained, and added to Laplace’s original work. Her translation became the University of Cambridge’s recommended textbook on celestial mechanics. Laplace offered the opinion that Mary was the only woman who ever understood his work. In Britain’s parliament, Mary was described as:

…one of the only six persons in England who understands Laplace.

The British government, in a desire to advance the cause of mathematics and science, awarded Mary an immediate pension of £200 a year in recognition of the importance of her work.

“I translated Laplace’s work from algebra into common language… I was astonished at the success of my book; all the reviews of it were highly favourable ; I received letters of congratulation from many men of science. I was elected an honorary member of the Royal Astronomical Society at the same time as Miss Caroline Herschel… It was unanimously voted by the Royal Society of London, that my bust should be placed in their great Hall… Our relations and others who had so severely criticized and ridiculed me, astonished at my success, were now loud in my praise.”

Mary Somerville
Personal Recollections, Published 1874
 

On the Connexion of the Physical Sciences

On the Connexion of the Physical Sciences was Mary’s next book. Published in 1834, its 500 pages ran to 10 editions, was translated into French, German, and Italian, and was one of the most popular scientific books of the nineteenth century.

Mary shared current developments in modern science with her readers, drawing scientific strands together to highlight an underlying unity of Nature.

“Dr. Faraday found that, when the electricity flowed through the spiral in one direction, the rotation of the plane of polarization was right-handed; and when it flowed in the other direction, the rotation of the plane of polarization was left-handed, the rotation increasing with the length of the prism and the intensity of the electricity… Thus Dr. Faraday’s experiment not only shows the increasing connexion between the sciences, but the tendency of all the forces of nature to merge in one great and universal power.”
Mary Somerville
On the Connexion of the Physical Sciences, Published 1834
 

“Dr. Young observes that the effect of radiant heat in raising the temperature of a body upon which it falls, resembles the sympathetic agitation of a string when the sound of another string which is in unison with it is transmitted through the air. Light, heat, sound, and the waves of fluids are all subject to the same laws; their undulatory theories are perfectly similar… darkness results from the interference of two undulations of light, silence ensues from the interference of two undulations of sound, and still water or no tide is the consequence of the interference of two tides.”
Mary Somerville
On the Connexion of the Physical Sciences, Published 1834
 
“It was one of those suggestive books which put into definitive, intelligible and communicative form the guiding ideas that are already working in the minds of men of science, so as to lead them to discoveries…”

James Clerk Maxwell
1870
 

Physical Geography

Mary’s published her next major work Physical Geography in 1848 when she was 67 years old. Again it was over 500 pages long, highly regarded, and popular with both scientists and the public. The great German geographer and explorer Alexander von Humboldt read it twice, then wrote to Mary:

“I do not know of a work of Physical Geography in any language that one could compare to yours… No facts, no grand views of nature escape you… You dominate in this as you do in astronomy, meteorology, and magnetism.”

Letter from Alexander von Humboldt
1849
 

In 1869, Mary was awarded the Royal Geographical Society’s most prestigious honor – the Victoria Gold Medal – for her work.

Molecular and Microscopic Science

Mary published her final scientific book Molecular and Microscopic Science in 1869 when she was 88 years old. It took her a decade to write and was composed of two volumes containing 180 illustrations. She covered three major fields: atoms and molecules; plant life; and animal life.

Staurastrum

Mary’s drawings of different species of Staurastrum – green algae.

Women’s Suffrage

In 1842, Mary encountered the unusual situation that the Royal Society would not accept her as a member, because she was a woman, but honored her by placing a marble bust of her in their great Hall.

In the nineteenth century, British women did not have the vote. In 1866, John Stuart Mill, the eminent philosopher, organized a petition to Parliament requesting voting rights for women. Mary Somerville’s was one of the 1,521 signatures on the petition. The petition was unsuccessful.

Honoring Mary Somerville

In 1819, Sir William Edward Parry named an island in Barrow Strait, Nunavut Somerville Island.

In 1879, the University of Oxford opened its first women’s colleges: Somerville Hall, named for Mary, and Lady Margaret Hall. Somerville Hall is now named Somerville College.

In 2017, the Royal Bank of Scotland replaced its paper £10 bills with polymer bills featuring Mary Somerville.

Mary Somerville bills

A Royal Bank of Scotland £10 bill featuring Mary Somerville.

Family and the End

In 1804, age 23, Mary married her Russian cousin Samuel Greig. In 1807, Samuel died. The couple had two sons, one of whom died in childhood. The eldest, Woronzow Greig, became a lawyer.

In 1812, age 31, Mary married her cousin Dr. William Somerville, a medical man. They had four children, two of whom survived to adulthood: Martha and Mary.

Mary loved to socialize. Her daughter Martha wrote:

“Gay and cheerful company was a pleasant relaxation after a hard day’s work. My mother never introduced scientific or learned subjects into general conversation. When they were brought forward by others, she talked simply and naturally about them, without the slightest pretension to superior knowledge.”

Mary and her family moved to Italy in the mid-1830s. Her husband, who was in his sixties, had retired. His doctor advised him to seek a warmer climate for the sake of his health. Moreover, the cost of living was lower in Italy than Britain, meaning their pensions and Mary’s royalties from book sales went further.

Mary Fairfax Somerville died peacefully in her sleep, age 91, on November 29 1872 in Naples. She was buried in the city’s English Cemetery. She was survived by Martha and Mary. Her husband, William, died in 1860.

In her final year, she wrote:

“I am now in my ninety-second year, still able to drive out for several hours. I am extremely deaf, and my memory of ordinary events, and especially of the names of people, is failing, but not for mathematical or scientific subjects. I am still able to read books on the higher algebra for four or five hours in the morning, and even to solve the problems.”
Mary Somerville
Personal Recollections, Published 1874
 
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Further Reading
Mary Somerville, Pierre Simon Laplace
Mechanism of the heavens
John Murray, London, 1831

Mary Somerville
On the Connexion of the Physical Sciences
John Murray, London, 1834

Mary Somerville
Physical Geography
John Murray, London, 1848

Mary Somerville
On molecular and microscopic science
John Murray, London, 1869

Mary Somerville & Martha Charters Somerville
Personal recollections, from early life to old age, of Mary Somerville
Roberts Brothers, Boston, 1874

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Comments

  1. Izzy says

    October 3, 2019 at 7:29 pm

    Did Mary Somerville ever invent something that mad a HUGE impact on the world. If so I would like to know it’s for a school project.

    Reply
    • Niamh says

      November 29, 2019 at 12:26 am

      She led John Couch Adams to look for and discover Neptune

      Reply

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