Purgatorial Stack

The Purgatorial Stack is the administrative designation for a Stack whose holdings have been collectively placed under a state of suspended valuation by the sustained application of Purgatorial Wax to its shelf-seals, catalogue boards, and (in cases of severe decay) the bindings themselves. It should not be confused with the Möbius Stack, which is defined by its classification as both Central and Sealed, nor with a Sealed Stack proper, which is closed by ordinary prohibition. A Purgatorial Stack is open, staffed, and visited daily. Nothing in it may be appraised.

The distinction is procedural rather than physical, and this has caused more difficulty than any other feature of the designation. A reader may withdraw a volume from a Purgatorial Stack, read it in full, and return it; what the reader may not do is say what it is worth. This prohibition is enforced by the Department of Stack Integrity and was upheld as recently as the Provisional Stack Relocation (1952-1954), during which three floors of a Purgatorial Stack were moved intact rather than sorted, on the grounds that sorting is a form of appraisal.

Origin and the Doctrine of Suspended Valuation

The designation derives from the practice of large-scale archival stabilization during the Purgatorial Period (Recorded Cycle 1,204–1,311), when holdings were sealed against deterioration in numbers that no subsequent recension has been able to establish. The official doctrine of the period held that sealing a holding with Purgatorial Wax created a "state of suspended valuation," a phrase recorded in Annual Reckoning 671 and never since repealed. What the Reckoning intended as a temporary measure — a holding suspended, corrected, and returned to circulation — became permanent wherever the Wax was applied at scale, because the seals could not be lifted without a corresponding act of appraisal, which the seals themselves forbade.

The formulation of the Wax is fixed by the Third Concordance (Clause 19, Subsection D), and its properties are set out in the Annex on Restricted Materials appended to the Sixth Concordance. Neither document addresses the question of duration. The Fifth Concordance prescribes the mandated procedure for application but is silent on removal, a silence that the Archive Stack has twice petitioned to have read as an oversight and twice been refused.

Floor 88-J and the Spill

The best-documented Purgatorial Stack occupies floors 88-J through 88-M, though the numbering of the constituent floors is not consecutive and one of them, 88-K, appears on no plan drawn after the spill. The incident in question occurred in the winter of Recorded Cycle 1,288, when a cask of Purgatorial Wax stored in the Restricted Materials Annex was breached during a routine inventory and ran along the shelf-channel of 88-J for a distance later measured at forty-one paces. Every holding the flow touched entered suspended valuation simultaneously and without individual review.

The resulting dispute between the Department of Stack Integrity and the office of the West Stack Brief is the longest continuous correspondence in the archive. The Department maintains that a spill is not an application and therefore creates no valid suspension; the West Stack office maintains that the holdings are suspended regardless of how the Wax arrived, and that the Department's position would require an appraisal to settle, which the Wax forbids. Neither office will put its argument in writing twice, and the file is now consulted chiefly as a precedent for how not to proceed.

"Where the seal is present, the suspension obtains. The manner of its arrival is a matter for the Annex and not for us."

— West Stack Brief, memorandum of 88-J

Scholarly Disagreement

There is no settled account of how many Purgatorial Stacks exist. The count depends on whether one reckons by floor, by shelf-run, or by holding, and the three methods give figures that differ by a factor of nine. Aris of the West Stack argued in the Annex Alpha recension that the designation attaches to the Stack and not to its contents, so that a single sealed shelf-run renders an entire floor Purgatorial; the Department has never accepted this and continues to record suspensions shelf by shelf.

A second disagreement concerns Cedric of the Wax Seal, who refined the Wax to mechanical correction after the Purgatorial Period and whose notes are the only working account of how a suspension might be lifted. Cedric's notes describe a resonant frequency at which the seal releases, but the Fifth Concordance's procedure does not mention frequency, and the Sixth Concordance's Annex treats the Wax as thermally activated only. Whether Cedric's method was ever performed is unknown. The Stabilization record lists no instance of a completed release.

Access and Maintenance

Readers entering a Purgatorial Stack are asked to leave their valuation slips at the threshold desk. The request is not enforced, but the Department notes that slips carried within the Stack have on four occasions returned with figures entered on them that no clerk wrote, and prefers not to discuss the matter further. Withdrawals are recorded in the ordinary way, by grey cylinder where the Stack's own fittings remain serviceable, and by hand where they do not.

Maintenance on a Purgatorial Stack is confined to the shelving, the lighting, and the floor itself. The Vertical Vector is checked annually against the plumb-line at 88-L; the check has failed twice in forty cycles and both failures were attributed to the Wax. Repairs to bindings, dust-jackets, and catalogue boards are prohibited without a waiver from the Department, which has issued eleven waivers since Recorded Cycle 1,290 and revoked nine of them. The remaining two are held by the same clerk, whose name is not recorded, and who has not been seen on floors 88-J through 88-M in some time.

Inventory of the 88-J Stack

The threshold board at 88-J lists the following, in the order the board gives them:

• Forty-one paces of shelving under seal, content unlisted.
• One hundred and six catalogue boards, valuation columns struck through.
• Four casks of Purgatorial Wax, three sealed and one accounted for by the spill.
• Two copies of Annual Reckoning 671, both annotated in the same hand.

The board does not list 88-K. Visitors are advised to consult the plank-map at the head of the stair before descending, as the stair serves 88-K whether or not the floor is there, and the Department has declined to rule on what a reader should do if it is.