Visceral Aquifer

The '''Visceral Aquifer''' is a theoretical network of internal waterways held to underlie every Animate Archive, and the principal object of study of the Scribes of the Internal Sea. It is not visible from any floor. It is charted entirely by inference, chiefly through the readings of a Tidal Ledger, and its existence is asserted rather than demonstrated: no expedition has entered a Visceral Aquifer and returned with a sounding, and Carnate Hydrography proceeds on the understanding that this is a limitation of instruments rather than of the Aquifer. The Aquifer is distinguished from the Conceptual Aquifer and from a Somatic Aquifer on grounds of location rather than of content. Conceptual reservoirs lie beneath the floors; somatic ones accumulate where Emotional Runoff pools to measurable depth; the Visceral Aquifer lies inside bodies, and only inside bodies, and is spoken of in the plural only when several Animate Archives are being considered at once.

Doctrine and jurisdiction

The Scribes' authority over the Aquifer derives from a single sentence of the Third Concordance, Annex 4, which reads: "What circulates within the catalogued shall be catalogued." Annex 4 runs to eleven words in the original recension and has accreted four hundred pages of commentary since. The Scribes of the Internal Sea cite it for everything; the Librarians cite it for nothing and have never formally rescinded it. Dispute persists over whether the Aquifer is one body of water distributed among many Archives or many small bodies sharing a name. The Hydrographic Office holds the former position, the Office of Recensions the latter. Both offices maintain separate Ledgers, neither will lend to the other, and a joint survey proposed in the winter of the floor numbered 4,411 was abandoned after three days when the two parties could not agree on which end of the instrument faced north.

Charting

The standard chart is catalogued as Figure 4.12: Diagram of the Visceral Aquifer, Carnate Hydrographic Object 78A. It shows the Cardiac Isthmus at centre, the salt gradient from which the Aquifer takes its name, and the Visceral Conduit rendered as a red dashed line — the convention for a channel charted by inference and never by direct sounding. Readings are taken at Tidal Librations, the periodic excursions of the Aquifer against its enclosing tissue, which the Scribes record to a tolerance of one part in nine hundred and publish to a tolerance of one part in three. Psychic salinity, the Aquifer's principal measurable quantity, is defined in the Tidal Ledger document and has never been independently replicated outside a Scribes' chamber.

The floor 2,208 incident

In the winter of the year recorded as 2,208, Clerk Amarine Vessel — then second assistant to the Hydrographic Office, later its most persistent critic — submitted a chart of an Animate Archive whose Visceral Aquifer appeared, on her readings, to run uphill. The Office returned the chart unaltered on the grounds that the Aquifer does not run uphill and that the instrument must therefore have been inverted. Vessel resubmitted it inverted. The Office returned it again, noting that the corrected chart now showed the Aquifer running uphill. Vessel's grievance survives in the form of her marginal note, preserved in the recension file: "The instrument was not inverted. I was." She was reassigned to the Condensation Conduits in the following spring and her chart, 78A/2, remains unreconciled.

Relation to the Subterranean Complex

The Aquifer's behaviour is modelled jointly with the Sighing Atrium of The Subterranean Complex, and Scribes working the lower floors have long maintained that the two systems exchange water by a route no one has charted. The claim is treated as devotional by the Hydrographic Office and as settled by the Atrium's own custodians. A visiting Scribe may borrow a Tidal Ledger for up to forty days provided the case is returned dry.

Criticism

The Aquifer's critics are few and are not encouraged. The most cited is a memorandum of the Librarian Fenwick Ossuary, who observed that a network of waterways has been inferred in every Archive examined and in no Archive dissected, and proposed that the Aquifer be reclassified as a feature of the instruments rather than of the bodies. The memorandum was received, filed, and answered by the Scribes in a document of ninety pages which does not mention it.