Josiah Meredith was a textile merchant. He was not a surveyor, nor an engineer, nor a man given to crawling through underground waterways in the dark. But he was a letter writer, and in November 1860 he wrote to his brother-in-law in Caldwell about a business matter that took him to the brewery district — and, almost incidentally, described the thing beneath it.

“I was taken to see the cistern beneath the old brewery,” Meredith writes, in letter number twenty-one of the thirty-six discovered behind a false wall panel in the Harker Street warehouse in March, “where the water is drawn for the malting. It is a vaulted chamber of stone, circular in form, perhaps twelve feet across, with channels converging upon a central basin. The water is very cold and very clear. I was told it has run since the building of the brewery, which is to say nearly a hundred years.”

The chamber Meredith describes — circular, vaulted, with converging channels and a central basin — is the same structure that municipal surveyor Pella Strand entered on 17 March 2026 through the flooded cellar of The Old Cooperage on Cooperage Lane. Strand measured it at approximately four metres in diameter, with a vaulted ceiling of 1782 limestone and three brick channels meeting at a central stone distribution basin. The water, on the day Strand found it, was fifteen centimetres deep, very cold, and very clear.

One hundred and sixty-six years separate the two descriptions. They could be paragraphs in the same report.

Dr Emmeline Furness, who is assessing the Meredith letters at the Polytechnic, presented the finding to the Heritage Committee on Monday. “Josiah Meredith described the cistern in 1860,” she said. “Pella Strand crawled through it in 2026. The city forgets its infrastructure. The water does not forget.”

The letter adds independent historical confirmation to Strand’s archaeological findings, strengthening the case for heritage listing of the entire Lower Conduit system. The Heritage Committee already has Strand’s sixty-page survey report (947 metres mapped, forty-seven maps, twelve cross-sections, seventeen notebooks) and the mason’s guild mark dating the oldest section to the 1760s. Meredith’s letter confirms that the system was known and in active use as recently as 1860 — and that its purpose as a water supply for the Cooperage Lane breweries was understood at the time.

Separately, the letter’s reference to a “second visitation of the fever” aligns with Furness’s earlier finding, in letters thirteen through eighteen, that a second fever outbreak struck Bobington in November 1860. Leonard Hewitt — the retired mathematics teacher who offered Furness three folders of transcribed parish data at her April lecture — has now provided detailed mortality figures from St Cuthbert’s and St Anne’s parishes.

The numbers are stark. Fourteen deaths in three weeks at St Cuthbert’s alone during November 1860. The total across both parishes exceeds twenty. The 1859 fever, which has been the sole epidemic in Bobington’s accepted public health history, was evidently not a single event. It was the first of at least two — and possibly more, pending further letters.

Furness has assessed twenty-four of the thirty-six letters. Twelve remain, covering the period from December 1860 to Meredith’s death in 1871. Full assessment is expected in early May.

“Every letter,” Furness said, “tells us something the city decided to forget. The cistern. The fever. The people who lived in the buildings we are now demolishing to find what they left behind.”

The Heritage Committee’s decision on the Lower Conduit listing is expected in early May.