LIBER LUNATICUS

In the phase of the new moon, when the disk is entirely in shadow and no reflected light falls upon the terrestrial surface, the lunaticus enters a state of profound withdrawal. The vital spirits, which under normal celestial conditions circulate freely through the ventricles of the brain, become sluggish and thickened. The patient reports a sensation of heaviness behind the eyes, as though the humors have pooled in the anterior chamber and cannot be moved by the animal spirits into their proper channels.

Observation across seventeen cases confirms a consistent pattern: speech slows, appetite diminishes, and the patient shows an aversion to candlelight or any artificial illumination. It is as though the absence of lunar light creates a sympathetic darkness within the cranium itself. The melancholic humor predominates. The blood cools. The physician must not mistake this state for ordinary despondence — it is a celestially induced condition that will resolve of its own accord when the moon returns.

As the moon waxes from new toward full, the lunaticus experiences a corresponding increase in vital activity. The animal spirits, which had been dormant during the new-moon withdrawal, now circulate with increasing vigor. The patient becomes restless, talkative, and prone to sudden enthusiasms that may appear rational in the moment but prove, upon examination, to lack proportion. A minor observation — the pattern of frost on a window, the shape of a cloud — triggers elaborate speculative constructions that the patient presents with absolute conviction.

The waxing phase is particularly dangerous because the patient does not appear ill. The increase in energy and verbal fluency may be mistaken for recovery. However, the experienced physician recognizes the signs: the speech accelerates over days, the ideas become more grandiose, and the patient begins to sleep less. The vital spirits are being heated by the returning lunar light, and the sanguine humor rises. The brain's middle ventricle, the seat of cogitation, becomes overactive while the posterior ventricle, the seat of memory and judgment, remains cold from the preceding phase.

The full moon is the crisis. All preceding symptoms reach their maximum expression. The vital spirits, now fully heated and expanded by the complete lunar illumination, overwhelm the brain's regulatory capacity. The patient may experience vivid hallucinations — typically involving transformation (the sensation of becoming an animal, of growing fur or feathers, of one's teeth lengthening) — which the ancients termed "lycanthropy" and attributed to the same celestial mechanism that governs the tides.

Clinical observation, however, reveals that the full-moon crisis is more often characterized by sleeplessness than by violence. The lunaticus cannot close their eyes. The light penetrates even shuttered rooms — or rather, the patient perceives light that is not objectively present, as the overheated spirits in the anterior ventricle generate their own internal illumination. The eyes remain open. The pupils dilate. The patient stares at nothing, or at everything, with equal intensity. This is the state the Romans called furor — not rage but an overwhelming fullness of perception that the mind cannot organize or diminish.

The crisis typically lasts two to three nights. The physician's role during this period is custodial rather than therapeutic. Restrain the patient gently if necessary. Ensure hydration. Do not attempt to reason with the patient or to correct their perceptions — the ventricles are temporarily beyond the reach of rational discourse. Wait for the moon to wane.

The waning phase is the aftermath. The vital spirits, which burned at their highest during the full moon, now cool rapidly — too rapidly for the body to adjust. The lunaticus enters a state that resembles convalescence but is not recovery: it is a deflation. The grandiose constructions of the waxing phase and the perceptual crisis of the full moon give way to a flat, exhausted clarity in which the patient sees everything exactly as it is and finds it insufficient.

This is the most melancholic phase. The patient remembers, with growing precision, the things they said and did during the crisis, and the memory is unbearable. The physician's task here is not pharmacological but rhetorical: to persuade the patient that the celestial cause of their condition absolves them of responsibility for its symptoms. The moon moved through them. They were the instrument, not the musician. This distinction, though philosophically debatable, is therapeutically essential.