Reconstruction
On 20 May 1747, according to the account he published six years later, Royal Navy surgeon James Lind selected twelve sailors suffering from scurvy aboard HMS Salisbury. He placed them in the same part of the ship, gave them a common diet, and divided them into six pairs receiving different proposed remedies. This was an unusually systematic attempt to compare treatments under broadly similar conditions, although it was neither randomized nor blinded and was far smaller than a modern clinical trial.
Lind described the patients’ ordinary food as water gruel sweetened with sugar, mutton broth, puddings, boiled biscuit with sugar, and suppers such as barley with raisins, rice with currants, or sago and wine. These provisions supplied energy but little dependable vitamin C after weeks at sea. The treatment pairs received cider; dilute sulfuric acid known as elixir of vitriol; vinegar; seawater; a medicinal paste containing garlic, mustard seed, dried radish root, balsam of Peru, and myrrh; or two oranges and one lemon daily. The citrus supply lasted only six days, but Lind reported that it produced the quickest visible improvement: one recipient became fit for duty, while the other recovered enough to nurse the remaining sick.
The experiment is known principally from Lind’s 1753 A Treatise of the Scurvy. Surviving ship records confirm his service and help reconstruct Salisbury’s movements, but the muster roll records almost no sickness until the vessel returned to Plymouth. Historians disagree over whether this reflects deficient official recording, an institutional reluctance to acknowledge illness, or grounds for doubting details of Lind’s retrospective account. The comparison should therefore be described as reported rather than independently documented in every particular.
Lind neither discovered citrus as a scurvy remedy nor identified a nutritional deficiency. Mariners had used citrus before him, and vitamins were unknown. His explanations mixed environmental, digestive, and putrefactive theories. He also proposed preserving citrus as a concentrated syrup, or rob, made with heat—processing now known to destroy much of its vitamin C. These complications, together with cost, storage problems, competing remedies, and ambiguous institutional evidence, help explain why his publication did not immediately transform naval provisioning.
The Royal Navy adopted a general lemon-juice issue in 1795 after later naval experience and the advocacy of physicians including Gilbert Blane. Scurvy is now understood as vitamin C deficiency, which impairs collagen formation and weakens gums, skin, blood vessels, and wound healing. Lind’s defensible legacy lies not in a solitary discovery but in comparing treatments, recording a striking dietary response, and exposing a food-system problem: preserved provisions could sustain calories while losing an essential nutrient.
Historical context
Britain was fighting France and its allies in the War of the Austrian Succession, and naval patrols protected commerce, blockaded ports, and searched for enemy shipping across the Channel approaches and Bay of Biscay. HMS Salisbury was a 50-gun fourth-rate warship with an official complement of roughly 300 men. Long-distance fleets could remain away from reliable fresh produce for weeks or months, depending on salted meat, ship’s biscuit, grains, dried fruit, beer, and other durable stores. European maritime trade already connected Atlantic ports with the Caribbean, Africa, and Asia, but preservation science could not yet explain why heating and prolonged storage made some foods ineffective against scurvy. The chemical identification of vitamin C remained nearly two centuries away.
Evidence
Written sources
ModerateLind’s 1753 Treatise directly reports the twelve-patient comparison, common diet, six treatment arms, and citrus response, but it appeared six years after the reported event and no contemporaneous medical case record is known.
Food identification
StrongThe Treatise explicitly names the common foods and proposed remedies, including oranges, lemon, cider, vinegar, seawater, and the medicinal paste.
Dating
ModerateLind explicitly dated the beginning of the comparison to 20 May 1747, and naval records confirm that he served aboard Salisbury during the relevant patrol, although the experiment itself is not independently entered in the surviving ship records.
Preparation method
ModerateLind reports treatment quantities and describes the shared shipboard diet, but these details depend on his retrospective published account.
Geographic attribution
LimitedLind stated only that the experiment occurred aboard Salisbury at sea. Reconstruction from the captain’s log places the ship in the Bay of Biscay and near the Loire approaches around the trial’s beginning, rather than at the supplied English Channel coordinates.
Historical interpretation
LimitedThe experiment is widely interpreted as an early controlled therapeutic comparison, but its historicity and exact conduct have been questioned because the ship’s muster roll records almost no sickness during the relevant period.
Visual reconstruction
InterpretiveNo known contemporary image depicts the experiment. Scenes showing Lind distributing citrus or observing paired patients are later artistic reconstructions.
Sources
- 1.James Lind (1753). A Treatise of the Scurvy, in Three Parts. Edinburgh: Printed by Sands, Murray and Cochran for A. Kincaid and A. Donaldson. library.si.edu/digital-library/book/treatisescurHistorical primary source
- 2.Graham Sutton (2003). Putrid gums and ‘Dead Men’s Cloaths’: James Lind aboard the Salisbury. Journal of the Royal Society of Medicine 96: 605–608. pmc.ncbi.nlm.nih.gov/articles/PMC539665/Scientific literature
- 3.Ulrich Tröhler (2005). Lind and scurvy: 1747 to 1795. Journal of the Royal Society of Medicine 98: 519–522. doi:10.1258/jrsm.98.11.519Scientific literature
- 4.Jeremy Hugh Baron (2009). Sailors’ scurvy before and after James Lind—a reassessment. Nutrition Reviews 67: 315–332. doi:10.1111/j.1753-4887.2009.00205.xScientific literature
- 5.Iain Milne (2012). Who was James Lind, and what exactly did he achieve?. Journal of the Royal Society of Medicine 105: 503–508. doi:10.1258/jrsm.2012.12k090Modern synthesis
Limitations
- majorcoordinates
The supplied coordinates and description place the experiment in the English Channel, but reconstruction from Salisbury’s captain’s log places the ship in the Bay of Biscay and around the Loire approaches when the experiment reportedly began on 20 May 1747. No precise experimental coordinate is securely documented.
- moderateconfidence
A confidence of 10 overstates the evidence. Lind’s 1753 account is the principal direct report, while the surviving muster roll records almost no sickness during the relevant period; historians dispute whether this reflects poor official recording or raises doubts about the trial’s exact conduct.
- moderatedescription
The phrase linking scurvy to missing fresh foods expresses modern nutritional understanding more clearly than Lind did. He demonstrated a reported therapeutic advantage for citrus but did not identify vitamin C deficiency and retained broader, partly incorrect theories of scurvy.
