Annex of Historical Necessity

The Annex of Historical Necessity is neither an annex nor, in the strict sense, a document, and the discrepancy has been the subject of continuous procedural objection since 1904. It is a standing instruction of the Third Concordance, held to apply automatically to any event that the archive has already recorded before the event occurred. The Annex occupies no floor. Its administration is assigned to the Historical Commissioner, a post whose tenure under the Third Concordance (Annex Ω) is itself reckoned retroactively, which is the source of most of the difficulty.

Origin and the winter of the missed sheet

The Annex arose from an incident on Floor 2,214 on the fourth of February 1897, during the survey season that later fed The Partial Survey. A recording clerk of the Guild of Archivists, Sennet Ardo, entered the floor's day-ledger in the morning and discovered by noon that the ledger already contained the same entry in his own hand, dated that evening, describing a fire in the map press that did not occur until the seventeenth. Ardo reported the discrepancy rather than reconciling it. His report survives in two versions: the copy he wrote on the fourth and the copy he wrote on the eighteenth, and the Bureau of Historical Paradox has declined to say which is original.

The Ruling of 1897 held that Ardo had not erred, having recorded accurately an event that had not yet happened. The difficulty was that no instrument existed to say so formally. Annex ⁴⁴ was drafted to close the gap and then abandoned; what was inscribed instead was a short subsidiary annex, later numbered in the sequence of the Third Concordance, which ordained that where the record precedes the event, the record governs.

"Where the sheet is written and the deed is not yet done, the deed shall be done in the manner of the sheet, and the sheet shall not be amended to suit the deed."

— Third Concordance, Annex 12, clause 2

Operation and the Priority Registry

In practice the Annex requires the Historical Commissioner to maintain the Priority Registry, a running ledger of events already recorded. An event entered in the Registry acquires necessity, meaning it must be permitted to occur and may be supervised but not prevented. Most entries in the Registry are trivial: a Visiting Inspector's arrival on a given date; the annual re-registration of the Lateral Stairwell; a scheduled loss of pressure in the eastern stacks. The Registry's first volume contains an entry for a single bell-ringing on Floor 881 in the year 1901, and the bell has rung on that floor every year since, though no mechanism has been located.

The Annex is administratively distinct from the Doctrine of Practical Necessity, though the two are constantly confused in the correspondence of the period. The Doctrine licenses acts already required; the Annex requires acts already licensed. The distinction was settled in the arbitration of 1911, whose record occupies four volumes in the Registry's second series and concludes that both instruments apply, "and that no further arbitration on the point will be received," a ruling that has generated eleven further arbitrations.

A record of difficulty

The Bureau of Historical Paradox has certified seven paradoxes arising from the Annex's operation, each of which proceeds under the Bureau's accelerated retro-identification pathway. The most persistent concerns Floor 1,900, where a sealed room was recorded as empty in 1908 and as containing a chair in 1909, but where the 1909 entry was found to predate the 1908 entry in the binding sequence. The Bureau's 1962 ruling holds that both entries are correct, the room is empty, the chair is present, and no one is to enter. A maintenance order of 1974 requiring the room's lock be oiled was returned unopened.

Scholarly disagreement turns on whether the Annex makes events inevitable or merely obligatory. The School of Historical Geomorphology maintains, on the strength of its chartered method (Annex 17-δ of the Third Concordance), that the Annex records only such events as the Tower's gradient of continuity would have produced unaided, and that the Priority Registry is therefore descriptive at heart. The School of Operational Necessity rejects this, noting that the Registry's 1904 volume contains an entry for the school's own founding dated a year after it was founded, and that no adequate account of the discrepancy has been offered by either side. The Principle of Contained Vericity, which both schools accept, forbids them from settling the matter by examining the relevant sheets.

Relationship to adjacent instruments

The Annex has been invoked to justify the Ruling of Proportional Necessity and has been cited against it, in the same clause, in Annex 12's notorious sixth paragraph, which reads: "the necessary is the recorded, and the recording of the necessary is itself recorded." The Algorithm of Harmonic Necessity was partially constructed to resolve this sentence and has not run to completion; the Annex's administrators regard its silence as an affirmation and the Schools regard it as an unresolved computation.

The contentious Annex Γ-12 has claimed, on the strength of the Annex's precedent, authority over other designations bearing the Gamma letter, an argument the Annex's own custodians have declined to endorse on the grounds that the Annex of Historical Necessity holds no holdings to be contested.

Administration

Entries in the Priority Registry are entered by hand in ink, in duplicate, one copy to the Commissioner and one to the Guild of Archivists. Both copies are retained and neither may be consulted before the entry is made. Visitors to the Registry are permitted during the hours after the closing of the ledger but not before, as a preceding entry would constitute a record of their visit. In 1931 a Visiting Inspector who arrived early was recorded entering eleven times and leaving twice; the discrepancy was absorbed into the Registry and added to the count of certified paradoxes without comment.

The Tier VI: Historical Continuity archive contains the Annex's full recension history, which runs to twenty-two file boxes, nine of which appear in the catalogue before they were written.