The Spirit Photographer of Beacon Hill

• Chapter 1 Silver Nitrate and Sorrow
• Chapter 2 The Studio on Beacon Hill
• Chapter 3 The First Anomaly
• Chapter 4 Emulsion of the Unseen
• Chapter 5 A Parlor of Whispers
• Chapter 6 The Widow's Double Exposure
• Chapter 7 Shadows in the Wet Plate
• Chapter 8 Spectral Anatomy
• Chapter 9 The Boston Athenaeum Manuscripts
• Chapter 10 The Silhouette in the Darkroom
• Chapter 11 Not the Departed
• Chapter 12 Teeth in the Chemical Bath
• Chapter 13 The Gilded Mourners
• Chapter 14 Lanterns Over the Common
• Chapter 15 The Murrain of 1862
• Chapter 16 Collodion and Carrion
• Chapter 17 The Shape of Apoplexy
• Chapter 18 A Séance in Louisburg Square
• Chapter 19 Parasites of the Ether
• Chapter 20 Through the Ground Glass
• Chapter 21 The Cold Lens
• Chapter 22 Consumed from Within
• Chapter 23 The Hunter's Portrait
• Chapter 24 The Long Exposure
• Chapter 25 Shattered Plates
• Chapter 26 The Lingering Shutter

The smell of ether and acetic acid was the true scent of Boston in the winter of 1869, at least inside the top-floor studio at number forty-two Charles Street. To the uninitiated, the room smelled like a physician’s surgical theater crossed with an apothecary’s cellar. To Silas Thorne, it was simply the smell of work.

Silas stood in the amber glow of his darkroom, his fingers dipped into a porcelain tray of iron sulfate. The skin of his thumbs and index fingers was stained a deep, indelible black—a permanent mantle of silver nitrate that no lye soap or pumice stone could scrub away. Photographers called it the mark of the trade. If you worked with the wet collodion process long enough, the sun turned the silver lodged beneath your epidermis into a permanent shadow. You carried your occupation on your hands until you died.

He rocked the porcelain tray with a steady, rhythmic wrist movement. On the glass plate submerged beneath the yellow liquid, an image slowly bloomed out of the milky gray emulsion. First came the dark, high-collared coat, appearing as a pale phantom against the dark glass; then the pale expanse of the forehead; and finally the hollow, unblinking eyes of a young man who had died three days prior in a drafty boarding house near the docks.

Silas watched the face emerge with neither revulsion nor reverent awe. He was thirty-four years old, though the hair at his temples had turned the color of damp ash during his three years with the Army of the Potomac. Down in Virginia, he had cleared dead men out of muddy trenches so he could set up his tripod. In comparison, the warm parlors and quiet bedchambers of Beacon Hill were a quiet mercy.

He lifted the glass plate by its edges, rinsed it in a bucket of well water, and stepped through the heavy black felt curtain into the main studio.

The afternoon light falling through the broad, north-facing glass roof was cool and flat. Sitting in the cast-iron posing chair at the center of the room was Mrs. Harriet Vance. She was dressed in the heavy, lusterless silk of deep mourning. A veil of black crape was pinned to her bonnet, thrown back over her shoulders to reveal a face worn thin by five months of sleepless grief.

"Is it... is he clear, Mr. Thorne?" she asked. Her voice was barely louder than the rustle of her silk skirts.

Silas slid the wet plate into a bath of sodium thiosulfate to fix the image. The yellow halides dissolved, leaving behind a sharp, permanent monochrome portrait on the glass. He brought the wet plate to the daylight and held it over a piece of black velvet so she could see the positive image.

"It is as clear as the glass allows, Mrs. Vance," Silas said gently. He spoke with the matter-of-fact tone of a craftsman who respected his client's pain too much to decorate it with false sentiment. "Your brother sat—or rather, remained—in good light. The features are sharp."

Mrs. Vance leaned forward, her gloved fingers clutching a silver-headed cane. She stared at the likeness of the deceased man. The corpse had been leaned against a heavy iron head-rest, his eyes carefully shut by the undertaker, his hands folded across his lap. In the photograph, he looked less dead than merely exhausted, resting between long engagements.

"He looks peaceful," she whispered. "When Arthur fell at Wilderness, we had no likeness to keep. Mother died holding a empty frame. I could not let William go into the earth without a face."

"It is a proper keepsake," Silas said. He placed the glass plate onto a wooden drying rack over a small alcohol stove. Once the water evaporated, he would varnish the collodion layer with gum sandarac to protect it from the damp salt air of the bay. "Give it twenty minutes to dry and take the varnish. You may wait in the parlor downstairs if the fumes are too strong."

"No," she said, her eyes fixed on the drying plate. "The smell does not bother me. It smells of clean things. Chemical things."

Silas understood. In the years following the war, Boston had become a city of ghosts and memory. Every third woman on Beacon Hill wore black crape. The parlors of the North End and the brownstones of the Back Bay were filled with framed tintypes of boys who had vanished into the red clay of Georgia or the fever wards of Washington. When a body was available to be photographed—even a cold one—it was treated as a precious, final opportunity to tether a soul to the physical world before the earth claimed it entirely.

Silas wiped his hands on his canvas apron. The black silver stains on his palms caught the dim afternoon sun. He walked over to his primary camera, a heavy mahogany box fitted with a brass-bound view lens manufactured by Voigtländer in Vienna. It was a fine piece of German engineering, but Silas had spent the past six months altering it.

He had removed the internal stops and re-ground the secondary glass element himself, using fine emery powder and rouge on a lead lap. Where standard portrait lenses favored a smooth, flattering soft-focus across the subject’s face, Silas’s modified optics possessed an unnatural, almost razor-sharp depth of field. It brought out every pore, every hairline fracture in the skin, every minute fiber of a wool coat. Some of his wealthier clients complained that his portraits were too harsh—that he showed the age in their eyes and the gray in their skin with an unchristian clarity. But Silas did not care for flattery. Light was a physical fact, like lead or gravity, and he believed the lens should record it without lying.

"Mr. Thorne?" Mrs. Vance broke the silence. She was looking at a shelf along the wall where several dozen glass negatives were stacked in grooved pine boxes. "Do you believe they know?"

Silas turned from his lens, a brass lens cap held loosely in his stained fingers. "Believe who knows, madam?"

"The ones who have passed," she said, looking down at her hands. "The spiritualists in Cambridge say the dead remain near the glass. They say the sun catches more than just the flesh. Mrs. Higgins in Louisburg Square has a parlor photographer from New York who claims to capture the blue aura of the departed standing behind the chair."

Silas let out a short, quiet breath—not quite a laugh, but the dry reaction of a man who had seen too many frauds to take them lightly. During his time in the field, he had seen spirit photographers double-expose plates with faint images of painted angels or masked assistants behind translucent screens. It was a lucrative business in a nation mourning three hundred thousand dead sons.

"Mrs. Higgins is paying for theatricals, Mrs. Vance," Silas said plainly. "A double exposure is easily accomplished. If I take a plate, expose it for three seconds on a sheet hanging in the closet, and then expose it again while sitting you in that chair, you will have a ghost shoulder-to-shoulder with you. It requires no help from the spirit world—only a careless hand with the brass shutter."

Mrs. Vance’s pale mouth tightened slightly, a mixture of disappointment and relief crossing her features. "I suppose so. It is a comforting thought, though. To think they are leaning over us, watching."

"If they are watching," Silas said, stepping back toward the small alcohol stove to check the plate, "I doubt they care to be caught on a collodion plate. The varnish is set. I shall encase it for you now."

He retrieved the finished glass plate, backing it with black velvet and securing it inside a small, embossed leather case lined with red silk. When closed, it resembled a pocket-sized testament. Mrs. Vance took it with hands that trembled slightly, paid him his two dollars in minted silver coins, and left the studio with the slow, measured tread of someone carrying an urn.

When the heavy oak door closed behind her, the silence of the top floor settled back down like dust.

Silas walked to the high window and looked down at Charles Street. Below, the iron-rimmed wheels of hansom cabs and coal wagons ground through the slush of gray snow. Men in tall beaver hats moved briskly against the bitter wind blowing off the Charles River Basin. Across the street, the bare, black branches of the Boston Common reached up into a sky the color of dirty pewter.

Boston in November was a city carved from cold granite and damp brick. It was a place of intellectual high-mindedness and deep, unspoken grief. The war had ended four years ago, but the city had not finished burying its dead. The memory of it hung over the city like the coal smoke spewing from the chimneys of the textile mills in Lowell and Lawrence.

Silas returned to his darkroom. He lit the small kerosene lamp fitted with a thick ruby-glass globe. The amber red light washed over the narrow room, casting long, sharp shadows across the shelves lined with chemical bottles.

He pulled a wooden box from beneath the workbench. Inside were his private plates—exposures he did not sell to clients, nor show to the curious onlookers who occasionally visited his shop. They were experimental test plates, made using his modified optics and a new collodion emulsion he had been compounding late at night.

Standard collodion was made by dissolving guncotton—nitrocellulose—in a mixture of ether and alcohol, then adding potassium iodide and bromide. Silas had begun adding minute quantities of cadmium salts and an extract of distilled coal-tar distillate that a chemist at Harvard had sent him in a sealed lead bottle. The mixture was unstable, volatile, and smelled foully of sulfuric acid and dead vegetation, but it increased the plate's sensitivity to light by half again as much as standard formulas.

He picked up a plate he had exposed the previous evening. It was a simple shot of the empty studio, looking toward the north skylight after sunset.

He held it up to the ruby light.

In the center of the frame, where the sunlight had faded into absolute dark, there was a strange, milky occlusion. It was not a flare from the brass casing of the lens; Silas knew the optical geometry of his equipment too well to mistake a internal reflection. Nor was it a fingerprint or an oil stain on the glass. The mark had a distinct, granular structure—a dense, thread-like network of gray filaments that gathered around the base of the iron posing chair, curling upward like the roots of a dried water-lily.

Silas traced the edge of the glass with a black-stained thumb.

He had noticed these marks on three different plates over the past fortnight. Always in the shadows. Always concentrated around the places where people sat or stood for long periods.

He did not believe in spirits. He had watched men die in mud-filled ditches while artillery shells tore through the pine woods of Chancellorsville, and he had never seen a soul rise from a torn chest. Death, in Silas's experience, was an immediate, brutal cessation of mechanics. When the machine broke, the light simply went out.

Yet the marks on the glass were real. They were physical deposits of metallic silver, reduced from the nitrate bath by the action of light. Something had acted upon the sensitive emulsion during those long, ten-minute night exposures. Something had left a shadow where there should have been only black glass.

He laid the plate down on a soft linen cloth, pulled a magnifying glass from his waistcoat pocket, and leaned down under the red lamp to look closer.

The thread-like filaments were not smooth like vapor or soft like fog. Under five times magnification, they possessed sharp, barbed edges, twisting around one another in tight, convoluted knots. They looked remarkably like the microscopic structures he had once seen in a medical text on vascular diseases—the choked, calcified arteries of an old man’s heart.

Silas set the magnifier down. The room was cold, the iron stove in the corner slowly losing its heat as the afternoon faded into twilight. Outside, the streetlamps were being lit along Charles Street, their gas jets flickering into small yellow points against the darkening brick façades.

He reached for a fresh glass plate, his fingers moving with practiced, automatic precision. He picked up the heavy bottle of collodion, poured a amber pool onto the center of the clean glass, and tilted it expertly back and forth until the viscous liquid covered every corner in a smooth, flawless film.

He waited ten seconds for the collodion to set to the touch—just sticky enough to hold the silver—and then lowered the plate into the dark dipping bath of silver nitrate.

Down on the street, a heavy carriage rumbled past, its iron tires striking the cobblestones with a dull, rhythmic clatter. Silas counted sixty seconds in the dark, listening to the drip of chemical solution inside the box.

Whatever was leaving its mark on his glass, he would find the optical reason for it. He was a photographer, not a mystic. Light was a wave, or a particle, or a master of chemistry, but it was always bound by natural law. If an image appeared on the silver, it was because something was there to reflect the light.

Silas pulled the sensitized plate from the bath, locked it into the light-tight wooden holder, and stepped back out into the darkening studio.

He set the heavy camera on its oak tripod, pointed the wide, brass-bound lens toward the dark corner where the iron posing chair stood, and pulled the black velvet focus cloth over his head.

Through the ground glass back of the camera, the world appeared upside down and reversed. The chair sat inverted, its cast-iron legs pointing up into the dark ceiling, its velvet back hanging down into the floorboards like a tongue.

Silas adjusted the brass rack-and-pinion thumb-screw. The image sharpened until every crack in the leather padding of the chair was visible in reverse. He clamped the focus lock, removed the ground glass, and slid the plate holder into position.

He took out his pocket watch, popped the silver case, and held the dark brass lens cap over the mouth of the lens.

With his left hand, he pulled the dark slide out, exposing the wet silver plate inside the dark interior of the box.

"Ten minutes," Silas murmured to the empty room.

He lifted the lens cap. The dark mouth of the brass tube opened, swallowing the gray twilight of Beacon Hill. Silas stood motionless beside the tripod in the quiet room, his watch ticking in his hand, his black-stained fingers resting lightly against the mahogany wood of the camera.

The winter wind howled down the chimney, carrying with it the faint, bitter scent of coal smoke and the cold, salt breath of the sea. Silas watched the dark corner of the studio, waiting for the light to do its work.

The studio at number forty-two Charles Street had not always belonged to Silas Thorne. Before the war, it had been the workshop of a French clockmaker who had eventually succumbed to the wet air of the Back Bay and returned to Paris, leaving behind a drafty, high-ceilinged room with three structural iron beams and a north-facing glass skylight that leaked whenever the snow thawed too quickly.

Silas had taken the lease in the spring of 1866, using the last of his back pay from the Quartermaster General and a modest sum saved from his pre-war work as a printer's assistant in Salem. The studio sat on the top floor of a four-story brick building tucked into the slope where Beacon Hill descended toward the salt marshes and timber wharves of the Charles River. Below him lived a dry-goods merchant, a cobbler who smelled perpetually of boiled leather, and an elderly widow whose black cat spent its days sunning itself on the shared landing of the narrow spiral staircase.

The location was strategic. Charles Street was the spine that connected the respectable brownstones of Mount Vernon and Chestnut Streets to the bustling commercial arteries of the city. Wealthy families from Louisburg Square could step down the hill without venturing into the noisy chaos of the docks, while modest clerks from the West End could save up their three dollars for a cabinet portrait without feeling intimidated by the grand parlors of Tremont Street.

Every morning at six, before the sun had cleared the top of the State House dome, Silas was awake. His living quarters were modest to the point of monasticism—a narrow camp cot tucked behind a tall wooden drying screen in the back of the studio, a washstand with a cracked tin basin, and a cast-iron stove that consumed three scuttles of anthracite coal a day merely to keep the collodion chemicals from freezing solid in their stoneware jars.

"Mr. Thorne?"

The voice came from the landing, accompanied by the dull thud of heavy wooden crates bumping against the handrail.

Silas opened the door to reveal Josiah, a sixteen-year-old boy from the Irish tenements of Fort Hill whom Silas paid four dollars a week to haul water, scrub floorboards, and clear ash from the stoves. Josiah was out of breath, his woolen cap pulled down over ears red from the river wind. He carried a wooden box bound with iron straps and stamped with the stencil of H.V. Davis & Co., Manufacturing Chemists, Cambridgeport.

" Ether and glass, sir," Josiah said, wiping his nose with the back of a woolen mitten. "The carter brought them down from the bridge. He wouldn't haul them up four flights. Said the ether smells like a hospital and he had a load of salt pork that shouldn't catch the taste."

"Set them by the sink, Josiah," Silas said, stepping aside. "Mind the corner. The glass is thin."

Josiah carried the heavy crate across the wide pine floorboards, which were stained with circular black rings where liquid silver nitrate had dripped from decades of plates. The room was cold enough that their breath puffed out in small gray plumes, but the light was beginning to fill the high space—a flat, shadowless illumination that only a true northern skylight could provide.

Photography was as much an exercise in manual labor as it was an art of shadow and optics. Before a single shutter could be tripped, the studio had to be prepared with absolute, almost surgical cleanliness. A single speck of coal dust landing on a wet collodion plate during exposure would create a starburst flare called a "comet," ruining five minutes of careful work.

Silas poured cold water from a stoneware pitcher onto a sheet of heavy German glass, sprinkled it with powdered rottenstone, and began scrubbing the surface with a rag made from unbleached cotton. He worked in slow, circular motions, his calloused thumbs sliding across the cold edge of the glass.

"Did you fill the water butt on the landing?" Silas asked without stopping his rhythm.

"Aye, sir. Two buckets from the pump on River Street. The water’s thick with ice this morning. Had to break the top with a hatchet." Josiah unbuttoned his coat and set to work with a stiff broom, sweeping the dried slush and mud left behind by yesterday’s grieving clients toward the threshold.

"Keep the dust down," Silas reminded him calmly. "Damp the broom."

"Always damp the broom," Josiah muttered, though there was no malice in it. The boy had learned early that Silas was not a harsh master, merely an exacting one. Silas spoke little of his time in Virginia, but Josiah had seen the faint, purple puckering of bullet wounds on Silas's shoulder when he washed at the basin, and he knew better than to push the photographer when his grey eyes were fixed on his work.

By eight o’clock, the room was prepared. The glass plates were polished until they showed no rainbow film under the light; the silver nitrate bath was filtered through fine Swedish paper to remove any floating particulate; and the coal stove in the center of the studio was roaring, filling the space with a dry, metallic heat that raised the ambient temperature to sixty degrees—the optimal heat for wet collodion to dry evenly without blistering.

Silas stood before his main camera, wiping the brass barrel of the Voigtländer lens with a soft piece of chamois leather. The camera was a masterpiece of Joiner's work—a heavy, double-extension box of dark Honduran mahogany, fitted with brass rack-and-pinion gears that groaned softly when turned. It sat on a tripod carved from solid walnut, its three legs ending in sharp iron spikes that bit into the floorboards to prevent the slightest vibration.

It was this machine that was Silas’s absolute master. It dictated his hours, his posture, and the chemical smell that seemed permanently lodged in the back of his throat.

The door down on Charles Street clicked shut, followed by the heavy, deliberate footfalls of someone wearing thick-soled boots ascending the stairs.

Silas did not look up from his lens cap. He knew the tread. It belonged to Dr. Elihu Sterling, a member of the Massachusetts Medical Society and an occasional lecturer on morbid anatomy at Harvard College. Sterling was one of the few men in Boston who visited Silas not to seek comfort for a lost child or a fallen brother, but to discuss the cold mechanics of visible light.

"You keep this stairwell colder than the vault at Mount Auburn, Thorne," Sterling said as he pushed open the frosted glass door. He was a tall, angular man in his early fifties, wearing a sharp-cut coat of dark beaver cloth and carrying a polished brass-capped cane. His white beard was trimmed close in the modern style, framing a long, intellect-driven face that rarely smiled.

"Cold keeps the collodion from boiling off its ether, Doctor," Silas replied, setting the chamois down. "If the room is too warm, the emulsion dries before I can get the plate from the bath into the camera back."

"Always the chemist," Sterling said. He walked directly to the high skylight, turning his back to the room as he peered out over the slanted slate roofs of Beacon Hill toward the gray streak of the Charles River. "I saw Harriet Vance leaving your studio yesterday afternoon. She was carrying one of your red velvet cases like it was the Holy Grail."

"She was taking her brother home," Silas said. "William Vance. Died of the throat distemper down by the docks."

Sterling sighed, a sound that rustled his stiff linen collar. "A waste. The man had good lungs until three weeks ago. It is an unmerciful winter. I buried four children in the North End this week alone. The air in this city is sour, Silas. It’s full of coal smoke, night soil, and the damp off the flats."

"The air is the air," Silas said, pulling a glass bottle of collodion from the shelf. "We have to live in it."

"Or die in it," Sterling corrected. He turned around, his sharp gray eyes landing on the rows of glass negatives stacked in their grooved boxes along the back wall. "I came to see the plates from the anatomical theater. Have you printed them yet?"

Two days prior, Sterling had paid Silas ten dollars to bring his field equipment to the Harvard Medical School classroom on North Grove Street. Silas had set up his tripod over the zinc-lined dissecting table while Sterling and his assistants demonstrated the arterial pathways of a fresh cadaver for forty medical students sitting in the stepped gallery above.

"They are printed," Silas said. He reached into a flat drawer beneath the workbench and pulled out three salt prints—photographic paper coated with egg whites and sodium chloride, sensitized with silver, and exposed to sunlight under the glass negatives.

Sterling took the prints and walked over to the north window, holding them up to the cool daylight.

The prints were stark, brilliant, and utterly unforgiving. Every incision made by Sterling's scalpel was rendered in crisp, silver-gray tones. The dark, retracted muscles of the subject's thigh looked like bundle of wet cords; the pale, exposed bone of the femur shone with an almost porcelain density.

"Remarkable," Sterling whispered, his thin fingers tracing the edge of the paper. "The medical illustrators at the hospital spend three days drawing what your lens catches in three seconds. Look at that—the bifurcation of the femoral artery is as clear as a diagram in Vesalius. You can even see the small calcifications in the vessel wall."

"It requires proper exposure," Silas said dryly. "And a subject that doesn't breathe during the ten-second count."

Sterling chuckled, though it was a dry, clinical sound. "Yes, the dead are famously good sitters. They never twitch their eyelids or shift their shoulders." He lowered the print and looked directly at Silas over his spectacled nose. "Have you thought any more about my offer?"

"Which offer?"

"The lantern slides for the lecture circuit. The Dean wants to compile a complete photographic atlas of human pathology. Tumorous growths, gangrene, the late stages of consumption. We would pay you two dollars per subject, plus expenses for your chemicals. It would require you to spend three mornings a week in the dissecting room."

Silas picked up a clean rag and began wiping down his work table. "I have enough dead flesh in this studio, Elihu. Half the people who walk up those four flights are carrying a cold child or waiting for me to go down to their parlors to photograph a husband before the coffin lid is screwed down."

"This is different," Sterling insisted, stepping closer. "This isn't for private grief. It's for science. It’s for understanding the physical causes of corruption. If we can see the exact structural changes that disease leaves on the organs, we can learn to fight it."

"Light shows what is there," Silas said. "It doesn't fight anything."

"It illuminates," Sterling said firmly. "And illumination is the first step toward mastery." He paused, looking down at his own leather-gloved hands, then looked back at Silas's stained, black-tipped fingers. "Speaking of illumination... Harriet Vance told my wife last night that you scoffed at her spiritualist friends."

"I told her the truth," Silas said. "Mrs. Higgins's spirit photographs are made with double exposures and zinc white paint on silk screens. I've seen the tricks. A photographer in New York named Mumler was dragged into court for it just last year. It’s a confidence game worked on people who are too sick with grief to use their common sense."

Sterling nodded slowly, though his eyes remained curious. "Mumler is a fraud, certainly. But there are men in Cambridge—serious men, physical scientists from the Scientific School—who are beginning to wonder if the silver emulsion doesn't possess a broader sensitivity than the human eye. The eye sees only the narrow band of the visible spectrum. But the silver plate responds to the ultra-violet, to rays we cannot perceive. Who is to say what light is cast off by the human organism when the blood stops moving?"

Silas set his rag down with a deliberate snap. He thought of the plate sitting in his darkroom from the night before—the granular, barbed filaments that had emerged from the black glass around the legs of the iron chair. He had not shown that plate to Sterling. He had not shown it to anyone.

"If there is light," Silas said, "it is physical. It obeys the laws of refraction and chemical reduction. If it doesn't leave a silver deposit on the glass, it doesn't exist."

"You are a stubborn man, Silas Thorne," Sterling said, though he pulled his purse from his coat pocket and counted out three five-dollar gold pieces onto the table. "That is for the dissecting room plates. Keep the negatives stored safely. I may need further prints for the medical journal next month."

"They will be in the grooved box under the sink," Silas said, sliding the coins into his waistcoat pocket.

"Good. Now, I must leave you to your living trade. I see Mrs. Appleton’s carriage pulling up down on the street. She will want her daughters photographed for the Boston assembly, and she will expect you to make them look like angels, regardless of what your lenses say about their complexions."

Sterling pulled his gloves tight, tipped his hat, and made his way back down the dark wooden stairs, his cane clicking against the steps with rhythmic precision.

Silas stepped back to the high window. Down on Charles Street, a double-horse carriage had indeed pulled up to the curb. A liveried footman opened the door, and a heavy-set woman in blue velvet stepped out, followed by two young women with pale, nervous faces wrapped in furs.

Behind them, across the wide expanse of the Common, the tall, bare elms stood like black iron skeletons against the white sky.

Silas turned back into the warmth of the studio. Josiah was already clearing away the wet polishing cloths, his face red from the heat of the coal stove.

"Josiah," Silas said.

"Sir?"

"Get two clean plates from the shelf. The thin ones from the German glass shipment. We have live subjects coming up."

"Aye, Mr. Thorne."

Silas walked to the side table where his chemical bottles were arranged in strict order of their density: ether, alcohol, guncotton, cadmium bromide, silver nitrate. He reached past them to the small, unlabelled amber glass jar that contained the dark coal-tar distillate he had received from the Harvard chemist.

The liquid inside was thick, dark, and viscous, catching the morning light with a strange, iridescent green sheen, like the wing of a beetle.

He touched the glass stopper, held it for a moment, then withdrew his hand without opening it.

Not for the living. The living were simple enough to capture—they squirmed, they blinked, they breathed, and their flesh reflected the daylight with a dull, familiar opacity.

He picked up the standard collodion jar, tipped the amber fluid across a polished square of glass, and watched it flow into the corners like clear honey, waiting for the chemical transformation to begin.