Based on Sherlock Holmes, Arthur Conan Doyle is a real-life Scottish surgeon who used deduction to diagnose patients and investigate crimes.

A new book details the work of Joseph Bell, the Edinburgh lecturer whose lessons sparked the creation of the world's most famous detective.

| Author, Sleuth-Hound: The Case of the Real Sherlock Holmes

It was still dark on a winter morning in 1878 when a pair of chestnut horses, hitched to a beautiful carriage, began their journey through the cobbled streets of Edinburgh. A cold front gripped the city like a steel glove, and every hour passed, it tightened. In the high driver's seat sat a coachman, his whip gently in hand, guiding two animals—Major and Minor—to the city's oldest hospital. Under the folding roof of the carriage was its only passenger, a stout man with a face fringed with gray moustaches. His steely blue eyes scanned his surroundings for anything out of the ordinary.

The carriage drove through the narrow lanes of the old town of the Scottish capital, where chimneys belched plumes of coal smoke into the still air, and ramshackle houses rose ten stories or higher. Every now and then, a hunched figure would emerge from a doorway, wander down the street, and disappear down the next road. But for the most part, the city was still asleep.

Finally, Major and Minor passed through the decorated gates, which form the main entrance of the old hospital. The coachman gave a gentle tug on the reins and the horses slowly stopped. Joseph Bell - chief surgeon at Edinburgh Royal Infirmary - got out of the carriage and nodded his thanks to the driver. He pulled his coat tighter and strode towards the hospital doors, eager to know what new mysteries the day would bring.

Sleuth-Hound: The Case of the Real Sherlock Holmes

The untold story of the Edinburgh doctor who became Arthur Conan Doyle's model for Sherlock Holmes and his adventures in the criminal world of Victorian Britain

The Royal Hospital Amphitheater contained a stage partially enclosed by a semicircle of stairwells rising to a large skylight, which illuminated the area below. In the center of the room was a wooden operating table with a tall tray filled with sawdust underneath to collect blood and other fluids. However, on this occasion, to the relief of some of the younger attendees, the table was not covered for the surgical demonstration.

The wooden stilts groaned under the weight of the medical students waiting in the room for training. When Bell came in, he was gone. He picked up his hat and coat, handed them to his devoted young clerk, and walked to the center of the circular room. Then he sat in a chair while a patient was brought into the room. Belle pressed her slender fingertips together as she studied the dress, the mannerisms, the features. The man's expressions and traits were presented to her. The audience fell silent and thrilled at the prospect of another sight, like the one that had made Bell such a famous figure in the medical world.

"Of course, gentlemen, he was a soldier in a Highland regiment," he said, breaking the silence that had suffocated the room.

Bell then confidently pointed out that the man's short stature meant he was probably a musician in a band, and that he was pointing to someone playing the harp as he walked. When the surgeon finished sharing his assessment, he turned his attention to the visitor who—to Bell's surprise—shaken his head in disagreement. In fact, the man said, he had never served in the armed forces. He was just a shoemaker with no military background.

"It was more of a floor covering," Bell later recalled, "but since I was pretty sure I was right, and seeing something come up, I did something very interesting." He ordered two strong assistants to take the patient and strip him to the waist. A lie was certainly exposed. On the man's chest, a letter "D" was clearly visible, tattooed on his skin using a spring-loaded tool covered with ink-covered needles. The tattoo was well-known - and embarrassing - to all audiences.

"Of course, the reason for his evasion was immediately apparent," Bell noted. The professor was not well received by anyone—least of all an army deserter. Little remains of what happened to the patient next, and Bell didn't think it was worth recording. The deception, once revealed, was the end of the story.

In routine performances like this, Bell turned the business of recognition into electrifying theater. His disciples were astonished, and nothing more than a plump young man with a bushy mustache who always sat in front of the audience. Under the lights of the amphitheater, Arthur Conan Doyle absorbed the details of every feat performed by the man, which in time inspired him to create Sherlock Holmes.

Since its first publication in late 1887, and in the 59 adventures that followed, Conan Doyle has become undeniably the most iconic and beloved fictional detective of all time. He was so popular in the late 19th and early 20th centuries that many people believed he was a real person. Holmes has been portrayed over 250 times in film and television, earning him the Guinness World Record for being the most visited human literary character in history.

The popular image of Holmes is so clear - wearing a deerstalker cap and tweed cloak, brandishing a cottage pipe and a magnifying glass - that you don't need to know the story to recognize the character. However, much less is known about the history of the man Conan Doyle cites in interviews and newspaper letters as the inspiration for Holmes the Great. In addition to his work as a surgeon, Bell assisted Police Scotland with numerous criminal investigations and made significant contributions to the growing field of forensic science.

In an 1893 interview with the Pall Mall Gazette, Bell downplayed his role in solving cases such as the 1878 murder of Elizabeth Chantrell.

As Surgeon explained, "The only credit I can give myself is that I always impressed over and over again on all my scholars—Conan Doyle among them—the immense importance of small differences, the infinite importance of small things."

Ever since Canon Doyle began studying under Bell at the University of Edinburgh in 1878, he was impressed by his professor's superhuman diagnostic methods, immortalized in many anecdotes told among students. When a young doctor diagnosed a patient with a limp as suffering from hip disease, Bell immediately scoffed, "Hip - nothing!" He continued: If you were careful, you will see that there are slits cut with a knife in the parts of the shoe where the pressure of the shoe on the foot is more, the men are suffering from corns.

But Bell instinctively knew that this patient had not come to the hospital to get help for his legs. "It's a case of chronic alcoholism," he explained. A red nose, a swollen and puffy face, bloodshot eyes, trembling hands, and twitching facial muscles all indicate this. However, inferences, gentlemen, must be confirmed by absolute and concrete evidence. "In this case, my diagnosis was confirmed by seeing the neck of a whiskey bottle protruding from the patient's right coat pocket."

For Bell, every patient was a text to be studied. Symptoms can reveal personal secrets, gestures can reveal clues, and the smallest details can help him decipher a medical mystery. This way of thinking—medical treatment as the science of reading signs—fascinated Conan Doyle. This showed him that diagnosis and recognition required almost the same skills. Both required a keen eye for hidden details and the ability to weave observations, inferences, and deductions into a coherent story.

Among those who knew him, Bell was a legend. He entertained the dinner guests with captivating stories. On the train, she entertained her children with insights into where the other passengers in the carriage were from, where they were going, their occupations and habits. "All this without him talking to them," his daughter recalled. When he confirmed his observations, we thought he was a magician. Bell made a lasting impression on everyone he met. As the historian Z.M. Hamilton, who studied at Edinburgh College, commented: "Bell was a favorite with his students and was responsible for creating almost an entire generation of amateur detectives."

The years that Conan Doyle spent under Bell provided the budding writer with plenty of fuel for his literature. The Creations Conan Doyle later wrote, "It is all very well to say that he is a clever man, but the reader wants to see examples of it—such as Bell gave us every day in the chapters."

Bell's influence on Holmes' law was profound. A former student once observed, "After Dr. Watson, no physician is more affectionate to Holmes than Dr. Joseph Bell, and very little is known of his private life." Bell provided the touchstone feature that set Conan Doyle's creation apart from other fictional detectives of the era. By scrutinizing a scratch on a desk, a trail of cigarette ash, or the gutter of a tallow candle, Holmes—and Bell—could make a case out of something seemingly insignificant. Their genius was not in knowing everything, but in noticing what others have overlooked and discovering its meaning.

Without Bell, it is unlikely that the world would know or even exist Sherlock Holmes. But the fictional work of the Baker Street detective has overshadowed the life, work, and humanity of a real-life bloodhound whose talents have shaped the minds of generations of medical students, cracked countless criminal cases, and diagnosed mysterious illnesses that afflicted both young and old under his care.

For all his achievements, Bell himself is largely absent from the history of forensic medicine and criminology. His contributions to these fields are not recorded in textbooks and are commemorated on a plaque at Scotland Yard. Yet for those who know how to look, his fingerprints are everywhere. His belief that the smallest material artifact could point to a deeper truth was not confined to the lecture hall: when Jack the Ripper began stalking London's Whitechapel district in 1888, Bell followed the murders from Edinburgh with professional fascination. He even claimed to have identified the killer, although the identity of his proposed suspect is unknown.

Case by case, Bell's forensic reputation was forged against the backdrop of a city engulfed in sensational crimes. There was the infamous poisoner Eugene Marie Chantrell, whose story so unsettled his drinking partner, the Scottish author Robert Louis Stevenson, that it later inspired The Curious Case of Dr. Jekyll and Mr. Hyde. Jesse King was the "baby farmer" whose trial for the murders of two infants in his care put Bell himself in the witness box. And there is the mysterious death of a young nobleman at the country estate of Ardelmont, a murder case so confusing that Bell's expertise is drawn into a courtroom saga worthy of Holmes himself.

Again and again, Bell and Little John helped create the template that Conan Doyle would later use to shape his fictional detective. Bell's tools of the trade? A sharp eye and a disciplined mind guided by the unwavering belief that the body always gives up its secrets.

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Author of Sleuth-Hound: The Case of the Real Sherlock Holmes, The Facemaker, and The Butchering Art: Joseph Lister's Quest to Transform the Grisly World of Victorian Medicine, winner of the PEN/E.O. Wilson Prize for Literary Science Writing. His television series "The Strange Life and Death of..." appeared on the Smithsonian Channel. He regularly contributes to the Wall Street Journal, Scientific American, and other publications, and holds a PhD in the history of medicine from Oxford University.

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