Lunar Society of Birmingham

• 1. Introduction

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  The Lunar Society of Birmingham earned its name from the full moon. Each month, a group of some of the most remarkable minds in Britain timed their meetings to coincide with the lunar cycle, so the moonlight could guide them safely home along roads that had no street lighting. They called themselves "lunaticks" - a cheerful play on the contemporary spelling of lunatics - and the joke suited them well. These were people who made gunpowder and pottery, designed engines and botanical classifications, wrote poetry and preached sermons, all while swapping letters and arguments about electricity, geology, and the nature of gases. How did a loose circle of friends in the English Midlands become the engine room of the British Enlightenment? And what happened when the same politics that fired their curiosity finally tore their world apart?

• 2. A Web of Friendships

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  Matthew Boulton and Erasmus Darwin first met sometime in 1757 or 1758, possibly because Boulton's mother's family were patients of Darwin, or possibly through their shared admiration for the printer John Baskerville and friendship with the astronomer John Michell. The two men could hardly have come from more different backgrounds. Darwin had studied medicine at Cambridge and Edinburgh. Boulton had left school at fourteen and entered his father's metalworking business in Birmingham by the age of twenty-one. Yet their complementary talents - Darwin's theoretical learning and Boulton's practical invention - turned out to be exactly what each needed.

  By 1758 a Derby-based clockmaker named John Whitehurst had joined their orbit, drawn in through his business supplying clock movements to Boulton's ormolu manufacturing operation. Whitehurst was already writing to Boulton that year with excitement about a pyrometer he had built, and expressing his eagerness to come to Birmingham "to spend one day with you in trying all necessary experiments".

  John Michell connected the group with Benjamin Franklin when Franklin visited Birmingham in July 1758, travelling with the stated aim of improving and increasing acquaintance among persons of influence. Franklin returned in 1760 to run experiments with Boulton on electricity and sound. Even after Michell moved to Thornhill near Dewsbury in 1767 and drew back from the group somewhat, Franklin remained a common thread linking many of its early members.

• 3. The Catalyst Named Small

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  William Small arrived in Birmingham in 1765, and nothing was quite the same afterwards. Small was a Scottish physician who had previously been Professor of Natural Philosophy at the College of William and Mary in Williamsburg, Virginia, where one of his students had been Thomas Jefferson. He came to Birmingham carrying a letter of introduction to Matthew Boulton from Benjamin Franklin, and that letter proved to be a catalyst. The loose circle of friends that had been forming around Boulton and Darwin began to cohere into something more deliberate.

  Josiah Wedgwood entered the picture that same year. He had struck up a close friendship with Darwin while campaigning for the construction of the Trent and Mersey Canal, and he went on to model his large new pottery factory at Etruria in Staffordshire closely on Boulton's Soho Manufactory. Richard Lovell Edgeworth appeared the following year through a shared enthusiasm for carriage design, and he brought along his friend Thomas Day, with whom he had studied at Corpus Christi College, Oxford and whom he had bonded over a shared admiration for Rousseau.

  James Keir visited Darwin in Lichfield in 1767, met Boulton, Small, Wedgwood and Whitehurst there, and subsequently decided to relocate to Birmingham. Joseph Priestley, then living in Leeds, became associated with the circle in 1767 when Darwin and Wedgwood grew interested in his electrical experiments. James Watt also visited Birmingham that year on the advice of his business patron John Roebuck, and was shown around the Soho Manufactory by Small and Darwin while Boulton was away. By 1768 the nine individuals who would form the nucleus of the Lunar Society had gathered, with Small at their centre. They called themselves, variously, "Birmingham Philosophers" or simply "fellow-schemers".

• 4. Moonlight Meetings

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  Small's death in 1775 - probably from malaria - forced the group to rethink how it held itself together. He had been the connective tissue between members, and in his absence those who remained placed the group on a more organised footing. Meetings would now be held on the Sunday nearest the full moon, running from two o'clock in the afternoon until eight o'clock in the evening. The first gathering under these new arrangements was probably held on the 31st of December 1775, and the name "Lunar" appears in the written record for the first time in 1776.

  Matthew Boulton was the driving figure behind this more formal structure. His home at Soho House in Handsworth became the principal meeting venue, and in 1776 he was recorded as planning "to make many Motions to the Members respecting new Laws, and regulations, such as will tend to prevent the decline of a society which I hope will be lasting." Yet Boulton's dominance also became a vulnerability. This period coincided with the peak demands of his steam engine business, and he was frequently absent. Meetings that had been regular in 1775 had become infrequent by the end of the decade.

  The society's geographic reach during this era extended well beyond Birmingham itself. No constitution, membership list, or minutes were ever maintained, and the evidence for what happened inside those meetings comes only from the private letters and notes of those involved. Members who lived near Birmingham were in almost daily contact with one another. Those further away corresponded at least weekly. The meetings, despite giving the society its name, were less central to its work than the constant exchange that happened between them.

• 5. Peak Years and New Voices

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  Joseph Priestley's move to Birmingham in late 1780 marked the beginning of what would become the society's most productive era. He had been involved with the group's work for over a decade before he arrived in person, and once there he brought a new level of energy to its activities. To accommodate his duties as a clergyman, Lunar meetings shifted from Sunday afternoons to Mondays. The dependence on Soho House also eased, with meetings rotating among several members' homes.

  Samuel Galton Jr. was an unusual presence among the Lunaticks: a Quaker who was also a gun manufacturer. Letters from other members document his attendance at meetings from July 1781. His daughter, Mary Anne Schimmelpenninck, later provided one of the very few first-hand accounts of what the society's gatherings were actually like. Jonathan Stokes, a botanist and physician who had known William Withering since childhood, began attending from 1783 after moving to Stourbridge. His time with the society was significant but short: after collaborating with Withering on his Botanical Arrangement of British Plants, the two fell into a bitter quarrel, and Stokes had severed his connections with the main group by 1788.

  These gains were offset by departures. Richard Lovell Edgeworth returned to Ireland in 1782 and stepped back from regular involvement. John Whitehurst died in London in 1788, and Thomas Day died the year after. Erasmus Darwin relocated to Derby in 1781, complaining of being "cut off from the milk of science", though he continued to attend meetings at least until 1788.

• 6. Revolution, Riots and Ruin

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  The French Revolution reached Birmingham not as an idea but as violence. The Priestley riots of 1791 inflicted direct damage on the Lunar Society's world. Joseph Priestley, whose support for the revolution had made him a target, was driven from the city and eventually left England for the United States in 1794. William Withering's home was invaded by rioters. Matthew Boulton and James Watt had to arm their employees to defend the Soho Manufactory.

  The society did not dissolve overnight. A younger cohort, drawn from the families of original members - including Gregory Watt, Matthew Robinson Boulton, Thomas Wedgwood, James Watt junior and possibly Samuel Tertius Galton - kept meetings going into the nineteenth century. Eight meetings are recorded in 1800, five or six took place before August 1801, and at least one is documented in 1802. As late as 1809, a visitor named Leonard Horner described "the remnant of the Lunar Society" as "very interesting".

  The end came unmistakably in August 1813, when Samuel Galton Jr. won a ballot for possession of the scientific books from the society's library. That single transaction, more than any formal declaration, marks the close of an era. In August of that year the library was distributed and the last trace of institutional continuity was gone.

• 7. Legacy and Later Societies

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  Birmingham has kept the Lunar Society's memory in stone and bronze. Among the memorials are the Moonstones, two statues of Watt, and a statue of Boulton, Watt and Murdoch by the sculptor William Bloye. Soho House is now a museum. A new Lunar Society was established in Birmingham by a group led by Dame Rachel Waterhouse, with the aim of playing a leading role in the development of the city and its wider region; Clive Stone was elected its Chair in July 2023, and the society was still active in 2024.

  The original society's ambiguous membership has prompted real debate among historians. A paper read at the Science Museum in London in 1963 argued that the old Lunar Society had been "the most important" of all the provincial philosophical societies in Britain, "perhaps because it was not merely provincial." The paper's claim was that all the world came to Soho to meet Boulton, Watt and Small, who were themselves acquainted with the leading figures of science across Europe and America.

  Some historians have pushed back, warning that the society's legend has led people to confuse its particular achievements with the broader intellectual and economic growth taking place across the English provinces during the eighteenth century. The University of Birmingham's Lunar Society, which evolved through several forms before being rebranded as the Devil's Advocate Society in 2019, continued to meet and debate in the spirit of the original, with membership open to undergraduates, graduate students and professional academics alike.