#On the Survey and the Diagnosis
This entry surveys the record of the Mainz Correction as it stands in A.S. 201. It covers what three Bureaus hold in their files and what one road still holds. It does not date the Correction. The year in which Severian of Mainz opened the city does not appear in any folio I have been allowed to handle, nor in several I was not. Records holds the sequence, Purity holds the sentence, and the road holds the rest. The calendar holds nothing. I can only admire an atrocity that loses track of its own birthday while keeping perfect count of its parishes.
Mainz lies in Zone 2 on the Rhine. It is a city of bridges and toll books, where barge cargo, pilgrim columns and the road toward Strasbourg meet under supervision. Everything that crosses Mainz is counted. Severian held two styles, Grand Inquisitor and Inquisitor-General of the Bureau of Purity, and both name the same man. He took the city's habit of counting, applied it to the city's soul, and found the total short.
His sentence survives in the Purity file without variant: This place is a single heretic body. By the Bureau's own wording the declaration covered the city and its province. The file does not say where the provincial boundary ran on the day he spoke, and I will not draw it for him.
The consequence was procedural before it was theological. An ordinary inquisitor proves one offence against one person and then knocks at the next door. Severian's diagnosis did away with the door. If Mainz was one body, then parish, street, guild and household were its organs. Guilt could be assigned by function: what a person belonged to, served, sheltered or was related to. Individual proof became a clerical courtesy. The finding that the Great Deceiver had settled into the city's structure is Purity's finding, and the Codex records it as such. Whether Mainz had in fact become heresy's flesh is a question the Bureau answered by operating, which is how the Bureau prefers to close questions.
#On Processing by Parish, Street, and Guild
Civic primers once taught the Correction as a scatter of local trials. They were wrong and have been told so.
Civic primers formerly described the Mainz Correction as a sequence of unrelated prosecutions triggered by local Rationalist sympathies.
Corrected. The prosecutions formed one Purity operation under Severian's command, carried out in sequence across the city. A scatter of trials implies a scatter of guilty men. Purity had diagnosed one body, and it treated that body once.
The work went parish by parish, street by street, guild by guild. Each unit of civic life was taken as an organ: the parish with its rolls, the street with its doors, the guild with its ledgers and seals. Houses were opened. Families were separated "according to doctrinal function." The file uses that phrase without defining it, and I repeat it without improving it.
Borrowed psalmists tuned the confession chambers. They were singers lent from the liturgy at a time when Brand-Singer work had no licence, no schools and no throat inspections. Their sustained note kept the confessor's breath steady while the Lictors of Purity inscribed the confession into flesh, with word and clause legible on the skin. Clerks of the Bureau of Records followed with quills. They copied what the iron had written, so the city's guilt existed in two media and one of them could be filed.
The work has two names. Public instruction calls it "sectoral correction." The sealed Purity appendix calls it "systematic vivisection." These are one operation described in two registers. The sealed phrase is no evidence of a second, more surgical campaign hidden behind the first. It is the same campaign, described for readers who were not expected to faint. Sectoral correction was written for primers, pulpits and travel permits. Systematic vivisection was written for the cabinet, where Purity speaks plainly about its anatomy because everyone in the room already owns a knife.
#On the Sentence Extended Along the Road
Severian's objections to ordinary punishment are better preserved than his calendar. A pyre consumes the evidence. A beheading ends too quickly. A prisoner who vanishes leaves only rumour, and rumour files itself badly. Any sentence that ended at the scaffold let the city forget it by the next market day. The Correction needed the opposite: a punishment that kept working after the trial, after the branding, and after the clerk had blotted the last line.
That need produced the Iron Choir of Mainz. Iron stanchions went up beside the Mainz road toward Strasbourg. Narrow cages hung from them, and the condemned were held upright inside. Their voices were already wounded, and they were made to sing hymns anyway. When a voice failed, a bell was made to answer in its place. The cage did not finish the sentence. It kept the sentence audible.
The placement did the rest. The road runs through the toll approaches, and the toll approaches are where Mainz makes everyone wait. A merchant whose cargo is being assessed, a pilgrim whose papers are being inspected, a carter queued behind them both: each was given an interval with nothing to do but listen. The city supplied the audience without being asked, because it had always made traffic stop and be counted. Severian only arranged for something to be heard during the counting. Bargemen, pilgrims and quartermasters' carts all passed the same rows, and none of them had to be summoned. Attendance was guaranteed by commerce, the one congregation Mainz has never failed to gather.
The full catalogue of the installation belongs to the Choir's own entry and should stay there: its rows, its fittings, its schools of singers and its maintenance quarrels. What belongs here is the change of function. The Correction processed a city parish by parish. It left behind a road that processes every traveller who uses it. The condemned stopped being defendants and became a lesson, hung at the height of a cart and timed to the pace of a toll queue.
#On the Surviving Record and Its Audience
The Correction's annex is filed with the civic record of Mainz. It survives as Purity likes its documents to survive: every heading complete, every place a reader might want a number blacked out.
PURITY ANNEX — MAINZ CORRECTION, SEVERIAN SEQUENCE Parishes processed: ███ Cages raised: ████ Voices retained past third day: 17% Children routed past installation under Little Witness pilot programme: █████ After-action note: "City compliance improved beyond ordinary human expectation." Attached witness drawing removed after paper began humming in storage.
The one figure that escaped the censor is the least useful. Seventeen percent of voices were retained past the third day. The annex does not say seventeen percent of what, by what measure, or what "retained" means for a throat held in iron. A reader who turns it into a death rate or a share of the city has supplied a denominator the Bureau withheld. Anyone who multiplies it by a guess at the blacked-out cage figure is writing an annex of their own, and should seal it under their own name.
The children's line needs a separate caution. The Little Witness programme later marched schoolrooms past the cages, and the annex lists it as a pilot attached to the installation. The file shows the programme using the Choir. It does not show children being led past the Correction while the parishes were still being opened, and I will not put them there. Records reports that the programme raised confessional punctuality in Mainz by sixty percent. That is Records' figure, about Records' preferred outcome, assessed by Records. No independent office has checked it, and none has been asked to.
The after-action note is the best sentence in the annex. "Beyond ordinary human expectation" is what a clerk writes when he has seen something and wants the paper to take responsibility for it. The removed drawing appears here only because the annex mentions it. Its subject is not recorded, and nothing of its contents is restored in this entry.
#On Present Custody
As of this survey, the Choir is active. Its custody is divided the way Mainz divides everything, by office and by fee. Purity keeps sentence authority over every cage. The Bureau of Orison and Song maintains the installation and its sound. Records keeps the documentation. Orison did not build the cages. It inherited the job of tuning them, and it repeats that distinction at every audit. That the punishment continues tells us about the institution and nothing about the people. No file says whether anyone processed under Severian's diagnosis still hangs on the road, and the files decline to say either way.
Severian's later course belongs to his dossier: his congress, his catechism, and the conflicting accounts of his end. Article 19 was added in A.S. 134, after the Correction. It carried his habit of civic suspicion into the household, but it is later work and authorised nothing that had already been done in Mainz.
The hum continues. On windless days the stanchions and crossbars sound with no visible cause, and empty cages have been reported answering occupied ones. The Engineers attribute the sound to vibration from the bellways. Purity says it is the murmuring of saints. Orison classifies it as residual liturgical resonance, Category Three, beneficial at approved distance. That makes three Bureaus and three explanations for one road. The Codex adopts none of them. Mainz has never waited for an adoption, and it goes on listening.

