Research Brief - History of Epsom Salts Discovery in Epsom, England

Key Facts: History of Epsom Salts Discovery

Discovery and Origin Story

1618 - Traditional Discovery Date: - By tradition, the discovery of Epsom spa water is attributed to Henry Wicker, a local farmer - In 1618, Wicker noticed that his cows refused to drink from a slow spring on Epsom Common - A well was dug by the farmer on Epsom common, half a mile west of Epsom, Surrey, after his cattle refused to drink from surface water in the area - Source: Wikipedia Epsomite page and Epsom page

Earlier Recognition (Pre-1618): - The distinct chemical properties of the local water had already been recognised in preceding decades - In 1603, local physicians had noted that the local water contained "bitter purging salt" - In late-Elizabethan times, it was thought that bathing in a pond to the west of the town centre could cure ulcers and other disorders - Source: Wikipedia Epsom page

The Mineral Spring and Well Development

1621 - First Facilities: - The first facilities for visitors were provided in 1621, when a wall was built around the spring and a shed erected for invalids - Source: Wikipedia Epsom page

1629 - First Authentic Account: - The first authentic account of the spa dates from 1629 - Abram Booth, of the Dutch East India Company, visited Epsom and described: "People coming there took a few glasses of the mentioned water – which has a taste different from ordinary water – after which walking up and down, these had in our opinion very good effect" - Source: Wikipedia Epsom page

Scientific Analysis and Identification

1654 - John Aubrey's Observation: - John Aubrey visited in 1654 and boiled some of the water - He noted that a "flakey" sediment, "the colour of bay-salt", was left behind - Source: Wikipedia Epsom page

1695 - Dr. Nehemiah Grew's Published Study: - Dr. Nehemiah Grew published his study on the water's composition in 1695 - This established Epsom salts as a medical remedy - Grew's work "Nature and Use of the Salt contained in Epsom and such other Waters" was published in 1697 (a rendering of his Tractatus de salis from 1693) - Source: Wikipedia Epsomite page and Nehemiah Grew page

1806 - Systematic Description: - Epsom salts were later systematically described in 1806 - Source: Wikipedia Epsomite page

Chemical Composition

Formula and Name: - Chemical formula: MgSO4·7H2O (magnesium sulfate heptahydrate) - The mineral is called epsomite (also known as Epsom salt or magnesium sulfate heptahydrate) - Source: Wikipedia Epsomite page

Natural Occurrence: - Epsomite forms as encrustations or efflorescences on limestone cavern walls and mine timbers - The Epsom spring arises "where the porous chalk of the North Downs meets the impervious London Clay" - Source: Wikipedia Epsomite page and Magnesium Sulfate page

17th Century Spa Town Context

Royal and Notable Visitors: - Charles II was a regular visitor after the Restoration of the monarchy; it was at Epsom that he met Nell Gwyn, who became his mistress - Samuel Pepys visited in both 1663 and 1667 - John Aubrey visited in 1654 - Celia Fiennes visited and noted that Epsom was "not a quick spring", that it was often "drank drye" - Prince George of Denmark (prince consort of Queen Anne) was also a royal patron - Source: Wikipedia Epsom page

Development as Spa Resort (1690s): - In the 1690s, John Parkhurst, Lord of the Manor of Epsom, began to develop the town into a spa resort - The Assembly Rooms in the High Street were constructed in 1692 - A new well was sunk to the west of South Street - By 1707, John Livingstone (local apothecary) had opened a bowling green, gaming rooms, and a ballroom - Regular coach service from London was established in 1684 - Source: Wikipedia Epsom page

Decline of the Spa (1720s)**

• In the mid-1720s, the popularity of Epsom experienced a rapid decline
• Driven partly by the economic consequences of the South Sea Bubble collapse
• Also due to competition from other spa towns including Bath and Tunbridge Wells
• By the 1750s, synthetic Epsom salts were being manufactured commercially
• Source: Wikipedia Epsom page

Historical Context - 17th Century Spa Culture

Broader Spa Town Era: - The 17th century saw the rise of spa towns across England - Thomas Guidott set up a medical practice in Bath in 1668 and wrote about the hot waters in 1676, bringing purported health-giving properties to aristocratic attention - Epsom was part of this broader movement of spa culture that spread across Europe - Source: Wikipedia Spa Town page

Geological Context: - Epsom is a spring line settlement where the permeable chalk of the North Downs meets the impermeable London Clay - Several tributaries of the Hogsmill River rise in the town - The geology creates conditions where mineral-rich springs emerge - Source: Wikipedia Epsom page

Themes/Angles

1. Cow Pasture Origin Story: The serendipitous discovery attributed to Henry Wicker in 1618, when cattle refused to drink from a spring on Epsom Common—a classic example of folk discovery of mineral waters.

2. From Folk Remedy to Medical Science: The transition from anecdotal use (1603 physicians noting "bitter purging salt") to systematic analysis (Nehemiah Grew's 1695 study), illustrating the emergence of experimental chemistry and medicine in the 17th century.

3. 17th Century Spa Culture: Epsom as a fashionable spa destination in the Restoration period, frequented by Charles II, Samuel Pepys, and other notable figures—part of the broader European spa town phenomenon.

4. Commercialization and Decline: The rapid rise and fall of Epsom as a spa town (1618-1720s), with the advent of synthetic Epsom salts manufacturing in the 1750s undermining the local monopoly.

5. Chemical Identity: The identification of Epsom salts as magnesium sulfate heptahydrate (MgSO4·7H2O), and its ongoing use in medicine and domestic remedies.

6. Geological Determinism: How the specific geology of the North Downs-London Clay interface created the mineral spring that gave rise to Epsom's brief fame.

Sources

1. https://en.wikipedia.org/wiki/Epsomite - Provided discovery date (1618), Henry Wicker story, 1695 Nehemiah Grew publication, chemical formula, and systematic description date (1806).

2. https://en.wikipedia.org/wiki/Epsom - Detailed historical account including 1603 physician observations, 1621 first facilities, 1629 first authentic account, royal visitors (Charles II, Pepys, Aubrey), 1690s development by John Parkhurst, 1692 Assembly Rooms construction, and 1720s decline.

3. https://en.wikipedia.org/wiki/Nehemiah_Grew - Confirmed Grew's 1695 study on Epsom water composition and his 1697 publication "Nature and Use of the Salt contained in Epsom and such other Waters."

4. https://en.wikipedia.org/wiki/Magnesium_sulfate - Chemical properties, natural occurrence as epsomite, and historical context of the name deriving from Epsom, Surrey.

5. https://pmc.ncbi.nlm.nih.gov/articles/PMC5377747/ - Medical journal article "The Waters of Epsom Spa" by Alex Sakula (1982) in Journal of the Royal College of Physicians of London—provides historical medical perspective.

6. https://en.wikipedia.org/wiki/Spa_town - Broader historical context of 17th century spa culture and Thomas Guidott's role in promoting Bath waters in 1676.