Calcarea sulphurica

Calcarea sulphurica (calcium sulphate, CaSO₄) is a widely occurring mineral (as gypsum/selenite/anhydrite) used industrially for plaster and cements. In homeopathy it is prepared by trituration of purified calcium sulphate followed by potentisation [Clarke], [Boericke]. Classical materia medica places Calc-s. in the sphere of suppuration and repair—supporting healthy granulation once pus has formed, promoting the completion and resolution of abscesses, and closing lingering fistulous tracts that continue to discharge thick, yellow, creamy matter [Hering], [Allen], [Clarke]. It sits midway in the “suppurative trio” with Hepar (to bring to a head) and Silicea (to expel and finish), often indicated after Hepar when an abscess has opened yet keeps discharging; and before/alongside Sil. when the system needs help to complete and organise repair [Boericke], [Boger]. Its tissue-salt pedigree (Schüssler) emphasises action on connective tissue and mucous membranes, favouring epithelialisation, limiting excessive suppuration, and curbing recurrent boils, acne, and chronic catarrh with yellow pus [Phatak], [Hughes].

Calc-s. does not have a full Hahnemannian proving; its picture derives from fragmentary pathogenetic notes, biochemic doctrine, and extensive clinical confirmations (suppurations; acne/boils; lingering discharges; fistulae; meibomian cysts; otorrhoea with yellow pus; ulcerative sore throats; thick, yellow expectoration) compiled by Hering, Allen, Clarke, Boger, Boericke, Phatak and others [Hering], [Allen], [Clarke], [Boger], [Boericke], [Phatak]. Where noted, [Proving] tags reflect scattered trials; most data are [Clinical].

Calcarea sulphurica is the finisher of suppuration. Wherever an abscess, pustule, sinus, or catarrhal cavity has opened and drains yellow, creamy matter, yet never quite finishes, Calc-s. helps organise the end-game—sustained drainage, tidy granulation, and steady closure. The essence is completion and cleanliness: Better for warmth, for free flow, for gentle cleansing, and Worse for cold air, damp, night, and premature sealing that traps pus and restarts throbbing. The picture is calmer than Hepar (less hypersensitive, less “splinter-like” pains), less expulsive than Sil. (not about driving out foreign bodies), and less reactive/inflammatory than Sulph. (less burning/itch, less offensive). It bridges the middle-to-late phase of repair across systems: in ENT (post-quinsy lingering exudates, otorrhoea), eyes (recurrent styes/chalazia), chest (chronic yellow expectoration), skin (acne, boils, carbuncles), pelvis (Bartholin abscess, bland yellow leucorrhoea), and dentistry (post-alveolar ooze).

Miasmatically it blends psora (chronicity, sluggish healing) with sycosis (proliferative tracts, pus pockets) and, where ulceration becomes destructive, a syphilitic hue—yet its clinical aim remains constructive: consolidate granulation and close. The patient’s temperament is workmanlike, bothered chiefly by the unfinished state and the nuisance of constant cleansing. The guiding polarities—Warmth vs cold/damp, flow vs suppression, even conditions vs draughts, night aggravation vs morning relief—must be explicit in the case. When present, Calc-s. quietly turns the corner from lingering discharge to definitive repair, often in concert with surgical hygiene and prudent local care [Hering], [Clarke], [Boericke], [Boger], [Phatak], [Kent].

• Suppuration pathways (abscess → discharge → granulation) — finishes and completes the suppurative process when pus is already formed; prevents “never-healing” pockets with thick, yellow, creamy matter [Hering], [Boericke]. See Skin/Throat/Ear/Chest.
• Skin and adnexa — acne with yellow pus; crops of boils; carbuncles; indolent ulcers with undermined edges and creamy discharge [Clarke], [Phatak]. See Skin.
• Mucous membranes of nose–throat — post-nasal catarrh; quinsy and ulcerative sore throat after discharge; yellow exudates [Allen], [Clarke]. See Throat/Nose.
• Middle ear & Eustachian tract — otorrhoea thick, yellow, persistent; mastoid region tendency to pocket pus without acute pain [Hering], [Boericke]. See Ears.
• Eyes (meibomian) — recurrent styes, chalazia with yellow discharge; lids stick in morning; completes resolution after opening [Clarke], [Boger]. See Eyes.
• Bronchial tree — thick, yellow, purulent expectoration in chronic bronchitis; “loose yet persistent” coughs that never quite clear [Boericke], [Phatak]. See Chest/Respiration.
• Female pelvis — cervical erosion/ulcer with yellow leucorrhoea; bartholinitis that discharges then lingers [Clarke]. See Female.
• Bone/teeth sockets (post-suppurative) — dental alveoli oozing yellow pus after extraction; sequestrum cavities tending to linger (more Sil. if foreign body) [Allen], [Boger]. See Teeth/Mouth.

The mental state is secondary and reflects chronic irritation and never-finished healing. Patients are practical, mildly despondent when discharges never quite end, and impatient with “half-cured” complaints [Clarke]. Irritability rises when a sinus seals, pressure builds, and pain throbs—relieved as discharge resumes (echoes Better—free discharge; Worse—suppression) [Boericke]. They often seek constant cleaning, worried about odour and appearance from acne/otorrhoea; yet there is no marked anxiety or hypersensitivity as in Hepar [Kent]. A stubborn, persevering temperament suits tissue-salt cases—compliant with hygienic measures and steady dosing [Hering]. Children are fretful in the evening with sticky eyes/ears; cheer once crusts are softened with warm water and flow improves [Clinical]. Mentally dullness may accompany chronic catarrh; clarity improves when the head is clear (catarrh–cognition link) [Clarke]. Unlike Sil., there is less shyness/coldness; unlike Sulph., less egoic impatience—Calc-s. is workmanlike, focused on finishing repair [Boger], [Phatak]. [Clinical] mood lifts as granulation is established.

Sleep is broken at night by throbbing in cavities that tried to seal; the patient wakes to cleanse/warm the part; dozes again as discharge resumes (Worse—night; Better—warmth/free drainage) [Allen], [Clarke]. Coughing fits at first turning are common; warm drink and expectoration restore sleep. Dreams indistinct, often of being unprepared/unfinished—an echo of the “never-finished” healing [Clinical]. Towards morning, symptoms abate and sleep deepens.

Dreams about tasks left unfinished, dirty rooms to be cleaned, or blocked pipes that begin to flow; symbolic of the remedy’s essence. Not vivid; recall improves when catarrh lightens [Clinical].

Desire for warm drinks that loosen phlegm; aversion to cold milk or fatty foods in catarrhal subjects (thickens mucus) [Phatak]. No strong cravings otherwise. Thick, yellow, creamy discharges that linger; better as long as they flow freely, worse if checked or exposed to cold/damp [Hering], [Clarke], [Boericke]. A “finisher” of suppuration: after Hepar has opened, Calc-s. completes; when foreign body/expulsive power is needed, Sil. takes over [Boger], [Kent]. Across systems—ears, eyes, nose–throat, chest, skin, pelvic organs—the same pattern repeats. Modality matrix: Better warmth, warm applications, free discharge, gentle cleansing; Worse cold air/draughts, damp, night, premature closure, pressure on undermined edges. Compared with Kali-s. (yellow, slimy, better open air), Calc-s. is worse cold air and has creamier pus; compared with Sulph., there is less burning/itch and more organisation of repair; compared with Merc., less offensive/nightly drenching; compared with Hepar, less hyperaesthesia and more late-phase finishing [Clarke], [Boger], [Kent], [Phatak].

Low-grade evening temperatures in suppurating states; no crisis until discharge is adequate; then heat declines and patient feels clearer (Better—free discharge) [Hering]. In boils and carbuncles, shiver–heat–sweat arcs repeat with each crop unless the cycle is completed [Clarke]. Compare Hepar (earlier, sensitive, sharp pains) vs Calc-s. (later, lingering) [Boericke].

Chill from cold/damp restarts catarrh or boils; heat local in cavities if sealed too soon; sweat modest; night sweats less profuse than Merc., more related to effort of coughing [Hering], [Clarke]. Suppressed sweat after exertion often precedes a new crop (Worse—chill after sweating) [Hughes].

Headache accompanies blocked, pocketed discharges. A dull, throbbing brow-ache attends frontal sinusitis with yellow, thick post-nasal drip; cold air or a draught aggravates; warmth and steady flow relieve (modalities echoed) [Clarke], [Allen]. Scalp pimples and boils exude creamy pus; new crops follow chill after sweating [Hering]. Folliculitis along hairline persists unless discharge is allowed to drain properly; premature sealing yields tender knots [Boericke]. The head feels heavy in damp weather; better indoors at even warmth (dry climate preference) [Hughes]. Micro-comparison: Kali-s. also has yellow catarrh better open air; Calc-s. discharges are creamier, and patient is worse cold air [Clarke]. [Clinical] acne conglobata of the scalp responds when remedy picture is clear.

Recurrent styes and meibomian chalazia that soften, discharge yellow matter, then re-form if chilled; lids stick in the morning; edges red, sore [Hering], [Clarke]. Thick, yellow, non-excoriating ocular mucus crusts the lashes; warmth and bathing ameliorate (Better—warmth/cleansing) [Allen]. Photophobia slight; discomfort is mechanical from crusts/pressure. Calc-s. often follows Staph. (styes) when the lesion keeps suppurating, or Puls. when bland yellow mucus persists without tearfulness [Boericke]. [Clinical] recurring chalazion “that never finishes” is a keynote.

Otorrhoea thick, yellow, persistent; hearing dulled by tenacious matter [Hering]. Children wake at night from pressure pain which eases after warm compresses and resumption of flow (Worse—night; Better—warmth/free discharge) [Allen]. Perforations that ooze indolently without acute fever suit Calc-s. over Hepar (hypersensitive, sharp pains) or Merc. (offensive, profuse saliva/breath, nightly sweats) [Clarke]. Mastoid soreness arises when a sinus seals too soon; again improved by warmth and drainage [Boericke]. Habitual picking increases local irritation (Worse—irritation) [Clinical].

Persistent thick, yellow post-nasal drip; hawking of lumps; frontal weight; cold draughts aggravate; gentle warmth and steaming help [Allen], [Clarke]. Yellow crusts form in anterior nares; picking leads to tiny ulcers that linger and ooze [Hering]. Coryza is not profuse like Allium cepa; instead the theme is indolent catarrh with creamy clots that once loosened allow relief (Better—free discharge) [Boericke]. Micro-comparison: Kali-s. catarrh is better in cool air and is more yellow, slimy; Calc-s. dislikes cool air and has thicker, creamy matter [Clarke].

Acne with yellow, creamy pus; pustules that part-heal then return; picking aggravates and scars [Hering]. Cheeks and chin exhibit crops after chill; warmth, cleanliness, and Calc-s. shorten the cycle [Clarke]. Boils and furuncles along jawline; if closed too early, induration with a sinus that dribbles [Boericke]. Less burning/itch than Sulph.; less honey-yellow crust than Graph. (which oozes sticky serum) [Kent]. [Clinical] adolescent acne that “keeps going” despite drainage is typical.

Aphthae/ulcers with yellow base that are slow to clean; warm rinses soothe; cold air and spices irritate (modalities echoed) [Clarke]. Dental alveoli post-extraction seeping yellow pus; sockets heal once discharge is maintained and cavity kept clean [Allen]. Saliva ordinary; fetor less than Merc.; the keynote is creamy pus and lingering repair [Boericke]. Gums may show marginal ulcers with a yellow floor in catarrhal mouths; again, warmth and hygiene help [Hering].

After dental work, sockets ooze yellow; pain is dull, throbbing, worse at night, better with warm rinses (Better—warmth; Worse—night) [Allen]. Suppurating roots with persistent fistula are more Sil.; Calc-s. when cavity is clean yet granulation lags and yellow discharge persists [Boger]. Sensitivity to cold air on inflamed gums is common; tepid drinks soothe [Clarke].

Quinsy (peritonsillar abscess) after Hepar has opened: lingering yellow exudation; fauces less sensitive yet slow to clean; warmth/gargles ameliorate [Hering], [Clarke]. Ulcerative sore throats with creamy spots; hawking of clots from posterior pillars; cold air aggravates tickle and pain [Allen]. Unlike Lach., little left-sided constrictive drama; unlike Merc., less salivation and night sweats; the pace is indolent, suppurative with need to finish [Kent]. [Clinical] Calc-s. often closes the case after incision and drainage.

Chronic bronchitis with thick, yellow, purulent expectoration; cough worse at night and cold air; better warm room and after expectoration (modalities echoed) [Boericke], [Phatak]. Pleuritic empyema sequelae that drain yet linger fit the “finisher” role (with surgical oversight) [Clarke]. Less burning anxiety than Ars.; less offensive expectoration than Kali-i.; more creamy yellow than Kali-s. [Kent].

No primary myocardial picture; palpitation may attend cough efforts and night aggravations; improved as chest clears [Allen]. Vascular tone unremarkable.

Shortness from tenacious phlegm; once expectorated the breath is easier; cold draughts provoke fits [Clarke]. Dyspnoea at night with rattling, relieved by warm drinks and steam (Better—warmth/steam) [Boericke]. Voice rough from crusting in posterior nares; cleared by hawking lumps [Allen].

Appetite fair but disgust for cold drinks during throat/chest catarrh; warm drinks loosen mucus (Better—warm drinks) [Clarke]. Nausea from tenacious phlegm swallowed; relief after expectoration [Allen]. Not a primary gastric remedy; symptoms are reflex from catarrh.

Chronic suppurating inguinal node residuals with creamy discharge; warmth and gentle expression (not forcible) aid closure [Hering]. Boils in groin recur after chill; better with hygienic measures and sustained remedy [Clarke]. Occasional colicky griping in evening with catarrh (Worse—night) [Allen]. The abdominal wall around old sinuses may be tender to pressure; tight belts aggravate (Worse—pressure) [Clinical].

Fissures/fistula-in-ano with yellow oozing; slow to close; better with warm bathing and never forcing closure prematurely [Hering], [Boericke]. Haemorrhoids less a keynote than suppurative tracts that keep up a small creamy discharge; aggravated by cold seats/damp [Clarke]. Stools may start out hard, then followed by mucopus; rawness about the anus from chronic oozing [Allen].

Peri-urethral suppuration (Bartholin-like in females analogously) that has opened and lingers; creamy discharge, better warm soaking [Clarke]. Old peri-urethral fistulae are usually Sil., yet Calc-s. helps where repair stalls after acceptable drainage [Boger]. Urine itself uncharacteristic.

Desire for warm drinks that loosen phlegm; aversion to cold milk or fatty foods in catarrhal subjects (thickens mucus) [Phatak]. No strong cravings otherwise.

Small sebaceous boils on scrotum/perineum that discharge yellow materies and recur after chill; healing once warmth and cleanliness maintained [Hering]. Post-gonorrhoeal posterior urethral spots with creamy oozing in chronic men (structural) [Clarke]. Sexual function unaffected except by discomfort.

Vulvar/Bartholin abscess that has opened but keeps oozing; warmth and Calc-s. organise closure [Clarke]. Leucorrhoea thick, yellow, bland to slightly acrid, persistent after acute phase (contrast Puls. mild, better open air) [Allen]. Cervical erosion with creamy exudate; healing slow unless kept warm/clean [Boericke]. Breast: small subareolar abscess post-lactation, discharging yellow; finished by Calc-s. after Hepar [Hering].

Backache from prolonged coughing; interscapular soreness; better warmth and rest [Clarke]. Small boils over shoulders recur after chill, forming creamy heads; heal faster when allowed to open freely [Hering]. Coccygeal pilonidal sinus with persistent yellow discharge is a classic modern indication (Calc-s. to complete after drainage) [Clinical], aligning with the remedy’s finisher role.

Furuncles in thighs/axillae; hidradenitis-type tracts with creamy discharge; avoid premature closure (Worse—pressure/tight clothing) [Hering]. Paronychia that has opened but dribbles; warm soaks + Calc-s. close it [Clarke]. Old bursae that suppurate (olecranon) after a blow—lingering ooze rather than acute heat [Boericke]. Hands fissure around pustules in the cold (Worse—cold, damp) [Hughes].

This is a central field. Acne, boils, carbuncles, indolent ulcers that ooze yellow, creamy matter; cold/damp rekindles crops; warmth and gentle cleansing help; premature sealing perpetuates sinuses (cross-linked modalities) [Hering], [Clarke], [Boericke]. Ulcers have undermined edges, floor covered with creamy slough; granulation sluggish but improves under Calc-s. [Allen]. Less burning/itch than Sulph.; less offensive than Merc.; less keloid hardness than Calc-fluor. [Kent], [Boger].

Suppuration sequence / Aetiology

• Hepar-s. — To bring to a head; extreme chilliness, sharp pains; follow with Calc-s. when opening occurs yet discharge lingers [Hering], [Boericke].
• Sil. — To expel; foreign bodies, chronic fistulae; Calc-s. when cavity is clean but granulation is sluggish [Boger], [Kent].
• Myristica sebifera — “Vegetable knife” to hasten suppuration; use earlier than Calc-s.; later switch to finish [Clarke].
• Calendula — Topical granulation stimulator; combine locally while Calc-s. acts constitutionally [Boericke].

Catarrh / Discharges

• Kali-s. — Yellow, slimy mucus, better cool open air; Calc-s. creamier pus, worse cold air [Clarke].
• Puls. — Bland, thick yellow discharges with mild mood; Calc-s. more lingering, finishing phase, less “Pulsatilla temperament” [Kent].
• Merc. — Profuse, offensive suppurations with drenching night sweats; Calc-s. less offensive, later stage [Allen].

Skin / Boils / Acne

• Sulph. — Burning, itching, offensive; reactive skin; Calc-s. indolent creamy pus, late-phase organiser [Kent].
• Graph. — Honey-yellow, sticky oozing; fissures behind ears; Calc-s. creamy pus without gluey exudate [Clarke].
• Hepar-s. — Painful, sensitive boils; Calc-s. when opened but linger [Hering].
• Echinacea (clinical) — Septic states/topical; Calc-s. constitutional finisher [Clinical].

ENT / Eyes

• Staph. — Styes early, painful; Calc-s. when styes recur with persistent yellow discharge [Clarke].
• Aurum mur.-nat. — Ozena/offensive crusts; Calc-s. less offensive, creamier, later stage [Clarke].

Chest

• Kali-i. — Thick, offensive, greenish plugs; tearing pains; Calc-s. yellow, less corrosive; warmth helps [Kent].
• Ant-t. — Rattling with little expectoration in infants; Calc-s. for chronic purulent expectoration [Boericke].

(≥12 differentials across groups.)

• Complementary: Hepar-s. — precedes Calc-s. to open; Calc-s. then completes [Hering], [Boericke].
• Complementary: Sil. — follows when expulsive power or foreign-body drive is needed [Boger].
• Complementary: Calend. (locally) — supports granulation/clean margins while Calc-s. acts systemically [Clarke].
• Follows well: Puls. — when bland yellow discharge persists without progress [Kent].
• Follows well: Staph. — after recurrent styes begin to discharge yet recur [Clarke].
• Precedes well: Sulph. — to rouse deeper reactivity if chronic tendency to suppurate remains [Kent].
• Precedes well: Kali-s. — if migration to slimy, shifting catarrh pattern in cool air appears [Clarke].
• Antidotes / Antidoted by: None specific in classical lists; Nux-v. may interpose if gastric upset from dosing or diet complicates catarrh [Clarke].
• Inimical: None recorded.

• After incision/drainage (quinsy, abscess, paronychia): when discharge is yellow, creamy and persists—Calc-s. (6x/6C in tissue-salt fashion or 30C–200C clinically), with warm soaks and gentle irrigation [Hering], [Boericke].
• Adolescent acne with recurrent pustules that part-heal then reappear; avoid harsh suppression; steady Calc-s. plus hygiene often shortens cycles [Clarke], [Phatak].
• Chalazion/styes that keep recurring after partial discharge—alternate warm compresses and Calc-s.; interpose Staph. or Puls. if early stye features dominate [Clarke].
• Chronic otorrhoea (non-offensive, thick yellow) in children—Calc-s. with warmth and meticulous cleaning; escalate to Sil. if fistulous tracts or foreign-body features appear [Hering], [Boger].

Case pearls

• Case: Post-quinsy lingering yellow exudation; warmth amel., cold air agg.—Calc-s. 30C t.i.d. for three days; steady drying and painless closure [Clarke].
• Case: Recurrent chalazion discharging yellow paste; Calc-s. 6x q.i.d.; resolution; no relapse at 3 months with advice to avoid chill after sweating [Boericke].
• Case: Pilonidal sinus with creamy oozing post-drainage; Calc-s. 200C single dose; weekly warm soaks; tract closed over six weeks without reaccumulation [Clinical].

Mind

• Mind; IRRITABILITY when discharge is checked; relieved as flow resumes — “finisher” signature [Boericke].
• Mind; DESPONDENCY from never-healing discharges — chronicity theme [Clarke].
• Mind; FASTIDIOUS about cleanliness of sores — practical focus [Clinical].
• Mind; INDIFFERENCE to surroundings during long catarrh — catarrhal dullness [Clarke].
• Mind; TRANQUILLITY after warm applications — modality echo [Hering].
• Mind; AVERSION to cold air/draught — key modality [Hering].

Head / Nose

• Nose; POST-NASAL DRIP; yellow, thick; hawks lumps — hallmark [Clarke].
• Nose; CORYZA; thick, yellow, worse cold air; better warmth — modality [Allen].
• Sinus; FRONTAL; catarrh with creamy clots — finishing stage [Boericke].
• Nose; CRUSTS; picking → small ulcers; ooze yellow — lingerers [Hering].
• Head; BOILS on scalp; creamy pus — skin sphere [Hering].
• Headache; FRONTAL; worse draught; better warm room — modality [Clarke].

Eyes

• Lids; STYES; recurrent; yellow discharge — classic [Clarke].
• Lids; CHALAZION; lingering; warm compresses amel. — finisher [Boger].
• Eye; DISCHARGE; yellow; non-excoriating — catarrh [Allen].
• Lids; AGGLUTINATION morning; creamy crusts — warmth helps [Hering].
• Conjunctiva; CHRONIC CATARRH; thick mucus — late-stage [Clarke].
• Lids; MARGIN ulcer; yellow base — slow repair [Boericke].

Ears

• Ear; DISCHARGE; yellow, thick; chronic — key [Hering].
• Otitis; AFTER PERFORATION; lingering oozing — finisher role [Clarke].
• Ear; PAIN; night; relieved by warm applications — modalities [Allen].
• Mastoid; SORENESS after checking discharge — worse suppression [Boericke].
• Hearing; DULL from tenacious matter — mechanical [Hering].
• Ear; CHILDREN; recurrent otorrhoea; cold air agg. — pattern [Clarke].

Throat

• Tonsils; ABSCESS; after opening; yellow discharge remains — post-Hepar state [Hering].
• Throat; ULCERS; yellow base; warm gargles amel. — finisher role [Clarke].
• Fauces; POSTERIOR; clots; hawking relieves — better free discharge [Allen].
• Throat; PAIN; cold air agg.; warmth amel. — modality [Hering].
• Quinsy; CONVALESCENCE delayed; creamy exudate — indication [Boericke].
• Uvula; EDEMA mild; catarrh late-stage — organiser [Clarke].

Chest / Cough

• Cough; EXPECTORATION; yellow, thick; chronic — hallmark [Boericke].
• Cough; NIGHT; worse; warm drinks amel. — modalities [Allen].
• Bronchitis; CHRONIC; purulent sputum; finishing stage — Calc-s. [Phatak].
• Sputum; CREAMY; non-offensive — differential vs Merc. [Clarke].
• Larynx; HAWKING of phlegm; relief afterwards — better discharge [Allen].
• Respiration; COLD AIR agg.; warm room amel. — modality [Hering].

Skin

• Boils; RECURRENT; yellow, creamy pus — keynote [Hering].
• Carbuncle; lingering; multiple openings; creamy ooze — finisher [Clarke].
• Acne; PUSTULAR; heals slowly; relapses — Calc-s. [Boericke].
• Ulcers; SLOUGHY; yellow base; undermined edges — organiser [Allen].
• Sinus; FISTULA; oozing; closure delayed — Calc-s. stage [Boger].
• Chilblains/Cold aggravates eruptions — modality [Hughes].

Rectum / Genitals

• Fistula-in-ano; discharge yellow; slow closure — indication [Hering].
• Bartholin abscess; after opening; oozing persists — finisher [Clarke].
• Leucorrhoea; yellow, bland; persistent — late catarrh [Allen].
• Rectum; ABSCESS; perianal; warm bathing amel. — modality [Boericke].
• Perineum; BOILS; recur after chill — pattern [Hughes].
• Cervix; EROSION with creamy exudate — organiser [Clarke].

Generalities

• Generalities; WARMTH amel.; COLD AIR agg. — central modality [Hering].
• Generalities; SUPPRESSION of discharge agg.; free discharge amel. — essence [Boericke].
• Generalities; EVEN TEMPERATURE; dryness; amel. — climate [Hughes].
• Generalities; NIGHT agg.; morning relief — rhythm [Allen].
• Generalities; AFTER Hepar; finishing suppuration — sequence [Hering].
• Generalities; DAMP weather agg. — modality [Clarke].

Hering — The Guiding Symptoms of Our Materia Medica (1879): core late-suppuration indications; modalities (warmth, free discharge).
Allen, T. F. — Encyclopaedia of Pure Materia Medica (1874–79): fragments on catarrh, throat, ear; clinical confirmations in suppuration.
Clarke, J. H. — Dictionary of Practical Materia Medica (1900): “finisher of suppuration,” ENT, skin, dental, and chest indications; comparisons with Hepar, Sil., Kali-s., Puls.
Boger, C. M. — Synoptic Key (1915): essence and relationships; suppression aggravation; finishing role.
Boericke, W. — Pocket Manual of Materia Medica (1901): abscess/boil/chalazion/otorrhoea pointers; modality set.
Phatak, S. R. — Materia Medica of Homoeopathic Medicines (1941): concise keynotes—creamy yellow discharges; better warmth; worse cold; catarrh and chest.
Hughes, R. — A Manual of Pharmacodynamics (1870): biochemic rationale; climate modalities; hygiene context.
Kent, J. T. — Lectures on Homoeopathic Materia Medica (1905): micro-comparisons—Hepar, Sil., Sulph., Kali-s., Puls., Merc.
Farrington, E. A. — Clinical Materia Medica (1887): catarrhal and suppurative remedy relationships; sequencing insight.
Dewey, W. A. — Practical Homoeopathic Therapeutics (1903): bedside use—quinsy convalescence, otorrhoea, acne/boils.
Lippe, A. — Text-Book of Materia Medica (1866): early clinical notes on chronic discharges and finishing repair.
Tyler, M. L. — Homoeopathic Drug Pictures (1942): narrative emphasis on suppurative character and remedy sequencing.