• Larynx & Trachea — extreme dryness (“as if a plug”), saw-like, barking cough, crowing inspiration, nightly suffocative paroxysms; pain and fear on inspiration (see Throat/Respiration/Sleep). [Hering], [Kent], [Clarke].
• Thyroid & Cervical Glands — goitre, throbbing, choking, sensitive neck; iodic–bromic glandular reactivity; hyper/hypo pictures by alternation (see Neck/Face/Generalities). [Clarke], [Hughes], [Boericke].
• Heart & Valves — palpitation, angina, loud valvular murmurs, fear of suffocation, dyspnoea worse lying, better sitting up; reflex cough from cardiac irritation (see Heart/Chest/Respiration). [Farrington], [Boger], [Kent].
• Male Genitalia — orchitis/epididymitis (esp. after mumps), indurated testes, drawing cord pains (see Male). [Hering], [Clarke].
• Mucosae (dry) — dryness of larynx, trachea, mouth; harsh, rasping breathing; voice hoarse/aphonic (see Mouth/Throat/Voice). [Allen], [Boericke].
• Anxiety / Night terrors of suffocation — wakes gasping, springs up to breathe; child clutches larynx (see Mind/Sleep). [Hering], [Kent].
• Croup / Laryngitis / Laryngotracheitis — the middle stage: hot, dry, barking; no rales; sound as of sawing wood (see Respiration). [Boger], [Farrington].
• Asthma (laryngeal, dry) — dry, whistling, worse before midnight; better warm drinks; worse cold air (see Respiration/Generalities). [Clarke], [Phatak].
• Hoarseness of singers/speakers — dry, scraping, voice tires easily (see Voice). [Allen].
• Gouty/Scrofulous habit — enlarged glands, goitrous neck, dry catarrhs (see Generalities). [Clarke].
• Pain pattern — cutting, raw, sawing sensations in larynx on breathing/coughing; relieved by food/warm drink (see Throat/Stomach). [Hering], [Boericke].
• Circulatory throbbing — carotids, thyroid, precordium throb with nervousness and heat (see Heart/Neck). [Clarke].

• Eating or drinking warm things — cough and laryngeal dryness ease after warm drinks; a few mouthfuls may abort a paroxysm (Throat/Respiration). [Hering], [Boericke].
• Sitting up / bending slightly forward — dyspnoea and heart oppression lessen; child wants to be held erect (Respiration/Heart). [Kent], [Clarke].
• Warm room / warm, humid air — mitigates dryness; avoids cold drafts (Generalities/Respiration). [Phatak], [Farrington].
• Slow, quiet breathing — patient self-paces to avert the sawing spasm (Mind/Respiration). [Allen].
• Covering the neck/throat warmly — reduces rawness (Throat). [Clarke].
• After sleep interruption (brief) when sits up and sips warm water—paroxysm passes (Sleep/Respiration). [Hering].
• Gentle pressure on the larynx (some cases) relieves tickle (Throat). [Boger].
• Chewing/swallowing — transiently oils the dry windpipe (Throat/Stomach). [Boericke].
• Time: toward morning — spells abate after the long midnight aggravation (Sleep/Respiration). [Hering].
• Between attacks — open air (mild, not cold) can soothe (Respiration). [Clarke].
• Warm applications over thyroid/testis in glandular cases (Neck/Male). [Clarke].
• Distraction/quiet reassurance — reduces panic loop in children (Mind).

• Before midnight (esp. ~11 p.m.) — croupy attacks, suffocative wakings, dry sawing respiration (Sleep/Respiration). [Hering], [Boger].
• Inspiration / deep breathing — worse on drawing breath; inspiration noisy, crowing; cough provoked by inhaling cold air (Respiration). [Kent], [Allen].
• Cold air / wind / uncovering throat — renews spasm and dryness (Generalities/Throat). [Clarke], [Phatak].
• Lying down, especially with head low — suffocation, must sit up (Respiration/Heart). [Hering], [Farrington].
• Talking, reading aloud, singing — hoarseness and cough (Voice/Throat). [Allen].
• Sudden fright / excitement — heart palpitates; breathing catches (Mind/Heart). [Kent].
• Exertion — palpitations, breathlessness, cardiac anxiety (Heart/Respiration). [Farrington].
• Dryness (heated rooms) without humidity — larynx “sticks” (Throat). [Clarke].
• Waking out of first sleep — bolt upright, grasps throat (Sleep/Mind). [Hering].
• Head turned back (extension) — tightens windpipe (Respiration). [Boger].
• After exposure to iodic sea-air (some goitre cases) — throbbing neck (Neck/Generalities). [Clarke].
• Swallowing saliva (empty) — scrapes larynx; provokes cough (Throat). [Allen].

Fear of suffocation dominates; the patient startles from first sleep with a conviction of impending choking, springs up, grasps the throat, and cries for warm drink or fresh—but not cold—air [Hering], [Kent]. Anxiety is physical rather than ideational: air won’t go in unless I sit up and drink something warm. Children are clingy, panicky on waking, with an anxious, red face and dry, whistling inspiration; they plead not to be laid down again (Mind ↔ Sleep ↔ Respiration) [Hering], [Boger]. Irritability follows paroxysms; they become peevish, refuse to speak lest the voice fail or cough awaken (Voice link) [Allen]. Over-sensitive to fright or excitement: heart flutters, breath catches, and a dry fit threatens (Mind ↔ Heart). Unlike Acon., the fear is not burning restlessness but air-hunger from laryngeal spasm; unlike Samb., there is dry barking noise, not silent suffocation [Kent], [Farrington]. During the day the mood may be cheerful; anticipatory anxiety at bedtime is strong—child begs for warm drink “so I won’t cough.” Adults dread to retire for the same reason. A characteristic “I must swallow often to oil my pipe” behaviour appears—sips and swallows to stave off the rasp (Throat/Stomach). Consolation helps little during an attack; physical measures (upright posture, warm drink) quiet the mind because they relieve the organ cause. Improvement in voice and ease of inspiration reduces anxiety in lockstep—good tracking sign (Voice/Respiration). Case [Clinical]: Child with nightly bolt-upright terror, saw-like breathing relieved at once by warm milk and Spong. 200C—sleeps thereafter till morning [Hering], [Farrington].

Light, hot head during paroxysm; face flushed or alternately pale with choking; carotids throb synchronously with thyroid pulsation (Face/Neck) [Clarke]. Headache from straining cough—vertex sore, temples beat; worse talking, better quiet warmth. Vertigo on looking up (laryngeal stretch reflex aggravates) [Boger]. Scalp sensitive to drafts. Head clears after warm drink and recumbent rest when the spasm passes. Compare Bell. (hot head with throbbing but moist mucosa), Acon. (hot fear with fever and dry skin) [Kent].

Lachrymation from strangling cough; lids red-rimmed after nights of wake; conjunctival injection with thyroid throbbing (iodic complexion) [Clarke]. Vision swims when gasping; transient blur resolves with calmer breathing. No specific photophobia; glare of lamplight excites cough in performers (Voice link) [Allen].

Roaring in ears with carotid/thyroid throbbing; momentary deafness during violent gasps. Eustachian tickle can provoke cough on swallowing (rare) [Allen].

Dryness; cold air in the nose provokes cough; sneezing ends in barking spasm [Hering]. Little discharge; if any, it is scant, thick after the dry stage (transition toward Hepar). Nose feels open yet air “saws” within (Respiration link). Odours of smoke or cold air from doorways trigger fits [Clarke].

Flushed, hot during attacks; then pallor; lips dry; child’s face anxious, chin moist with warm drink [Hering]. Goitrous neck may visibly throb, jaw tight with fear. Submaxillary nodes enlarged in scrofulous types (Glandular affinity) [Clarke]. Cyanosis rare; if present, severe spasm/heart involvement (Heart/Respiration).

Dry tongue, parched mouth; wants warm sips. Voice hoarse, husky, “leather-like” tonality; speech tires the larynx (Voice) [Allen]. Saliva scant; efforts to moisten the larynx with swallowing are characteristic. Teeth/jaws otherwise not central.

Toothache during catarrhal states. Teeth feel elongated or sore from jaw tension. Grinding teeth during sleep in children with respiratory distress.

Larynx and trachea are exquisitely dry—as if air passes through a dry sponge; tickle or plug sensation; sawing, barking cough; crowing inspiration; rawness and pain on talking [Hering], [Boericke], [Allen]. Warm drinks give instant lubrication; cold air or inspiration rekindles the tickle (Modalities). Voice breaks; aphonia in morning, better later (Voice). Child grasps larynx during fit; touching trachea can be painful [Hering]. Tonsils usually not the seat; the windpipe itself is. Compare Acon. (first, hot, restless), Spong. (second, dry sawing), Hepar (third, rattling, sensitive, yellow expectoration) in croup chronology [Boger], [Farrington]. Micro-note: this tallies with the general Better warm and Worse cold inspiration modalities.

Craves warm drinks; warm milk/water checks cough (Better warm drink) [Hering]. Nausea rare; when present, from gagging cough. Swallowing food oils the larynx; a few bites can abort a paroxysm—an important cross-modality (Stomach ↔ Throat) [Boericke]. Aversion to cold water during the dry stage. Anxiety worsens when the stomach is empty at night (Mind link).

Drawn from coughing; muscle soreness; umbilical aching during paroxysms. Thyroid-portal interactions (iodine states) may bring light looseness in mornings [Clinical] [Clarke]. Liver not a keynote. Abdominal support comforts a child during coughing.

Urine scanty, dark, and hot during cough episodes. Frequent urging with small quantities. Burning at neck of bladder. Involuntary urination in children during coughing spells. Irritation of bladder in thyroid disorders.

Constipation with hard, dry stool. Urging with ineffectual straining. Rectal pain after cough. Tenesmus in children with obstructive coughs. Rarely indicated unless secondary to constitutional sluggishness.

Orchitis/epididymitis (esp. post-mumps): swollen, hard, tender, drawing up the cord; better warm applications; worse jarring/walking [Hering], [Clarke]. Indurated testis with lingering hardness—Spong. rivals Clem., Rhod., Puls. per constitution [Farrington]. Sexual excitement aggravates palpitations and laryngeal tickle (Heart/Throat).

Thyroid fluctuations around menses—neck throbs, choking, heat flushes (Thyroid affinity) [Clarke]. Laryngeal hoarseness premenstrually; voice fails under strain. Pregnancy with laryngeal spasm at night points to Spong. if dry, barking, better warm drinks, worse lying [Farrington].

Pathognomonic: dry, hoarse, barking cough with crowing, sawing inspiration “as if a saw going through pine-wood” [Hering], [Boger]. Worse before midnight, worse lying, worse on inspiration, better warm drinks, better sitting up. Sense that air is too scant in the larynx, not the bronchi; laryngeal spasm dominates. Voice husky/aphonic; each word may start a fit. No expectoration or scanty, tough threads in transition (towards Hepar). Whooping-cough episodes with crowing inspiration and dryness (consider alongside Dros., Cocc.) [Clarke], [Farrington]. Asthmatic breathing with dry whistle in thyroid subjects; sea-air winds provoke (Generalities).

Palpitation with suffocative fear; loud valvular murmurs; angina with choking in throat; cannot lie down; must sit up; better warmth [Farrington], [Clarke], [Boger]. Sensation as if heart stopped and started, or beats shake the whole body; carotids and thyroid throb; anxiety compels quiet sitting (Mind ↔ Heart). Spong. suits valvular disease with rough systolic quality and laryngeal dryness (cardio-laryngeal reflex cough). Compare Digitalis (slow, intermittent pulse with nausea from least motion), Cactus (iron band), Spigelia (stitching neuralgia to left arm) [Kent], [Farrington]. Cross-links: Better sitting up, Worse exertion, Worse night repeat the respiratory modalities.

Chief sphere of action along with throat. Cough is dry, barking, hollow, and metallic, like a saw through pine wood—a keynote [Clarke]. Worse at night, before midnight, or on waking from sleep. Inspiration is difficult, laboured, or crowing, with fear of suffocation. No expectoration or only in small hard pellets. Painful dryness and rawness in trachea. Respiration anxious, short, and stridulous. Palpitations violent and audible, worse from excitement or exertion. Sensation as if the heart would stop. Must sit up in bed and grasp for air [Hering].

Cervical stiffness; neck fulness with thyroid throbbing; must loosen collar (Neck/Thyroid) [Clarke]. Inter-scapular ache after paroxysms; dorsal muscles sore. Warmth to the back soothes general stiffness.

Trembling of hands during heart or respiratory complaints. Coldness in feet, hands, or legs. Numbness or tingling during palpitations. Restlessness before coughing. Weakness in limbs from poor circulation or hormonal depletion.

Dry, rough skin. Eruptions suppressed or sluggish to resolve. Iodine-related pigmentation in chronic cases. Glands indurated. Sweat suppressed during fever or excitement. Cold, clammy skin during cardiac collapse.

First sleep is treacherous: soon after dropping off, the patient starts, springs up, grasps the throat, and gasps with crowing, sawing respiration; the room must be warm, and warm drink must be administered to re-lubricate the larynx [Hering], [Boger]. Sleeping flat is impossible; sits up, bends forward, clings to the carer (Respiration ↔ Mind). Attacks cluster before midnight; if the first hours pass quietly after Spong. and warm sips, the rest of the night may be fair [Hering]. Anxiety anticipates sleep; children beg not to be laid down. Dreams of choking and of falling into water (air-hunger symbolism) are reported; the bed feels too hard from muscular soreness after coughing (Back). Sweating is moderate; heat relieves, cold air from a window worsens. Waking in the small hours, dryness may be less; a warm sip prevents a late fit. After several nights, when the voice holds in the morning and the first sleep passes quietly, convalescence has begun (Voice/Sleep cross-trend). Compare Samb. (after-midnight suffocation, profuse sweat, but no barking/sawing), Dros. (paroxysmal cough worse after midnight with gagging without sawing on inspiration) [Farrington], [Kent].

Of strangulation, tight collars, smoke in the throat; anxious, startle-laden; children scream and sit up in fear. Dreams abate as the laryngeal dryness is controlled by regimen and the remedy [Hering], [Allen].

Often a dry, hot febrile state in croup/laryngitis, with flushed face, hot head, dry skin; no sweat in the dry stage; later, as expectoration begins (transition to Hepar), temperature may fall [Hering], [Boger]. Thirst for warm drinks rather than cold distinguishes the Spong. stage (Food & Drink). Pulse can be sharp from anxiety; carotids and thyroid throb (Heart/Neck).

Chill: from exposure to cold air or drafts on the neck, immediately exciting the dry stage; child shivers at the door-crack (Throat/Modalities) [Clarke].
Heat: dry heat with laryngeal burning; heat of bed better, if air is warm/humid; dry heat of room without humidity worse (dryness).
Sweat: moderate after paroxysm; not as profuse as Samb.; sweat does not, per se, relieve unless dryness has been broken (Generalities) [Hering].

Craves: warm drinks, warm milk, soft food
Aversion: cold drinks, meat, cold foods during the dry stage
Worse from: cold water, milk, ice, and eating before bedtime. Salted sea-foods sometimes aggravate iodic subjects
Better from: warm drinks, eating lightly

Spong. is the archetype of dry spasm: dry larynx, dry trachea, dry, barking cough, sawing/crowing inspiration, suffocative first sleep, better warmth and warm drinks, worse cold air and inspiration, worse lying, better sitting up [Hering], [Boger], [Farrington]. The organ logic is coherent: an iodic/bromic animal substance with glandular (thyroid/testis) and mucosal tropism induces a dry, irritable, spasmodic state; the patient self-treats by warming and lubricating (“I must drink to oil it”). The croup triad (Acon.→Spong.→Hepar) encodes the temporal march: Acon. (hot, anxious outset), Spong. (dry, sawing mid-stage), Hepar (rattling, sensitive, suppurative stage) [Boger], [Farrington]. In adults, the same logic serves dry laryngitis, performer’s hoarseness, asthma with laryngeal spasm, and cardio-laryngeal reflex coughs in valvular disease (Heart ↔ Respiration). Thyroid affinity yields goitre with throbbing choking and intolerance of collars; testicular affinity yields indurations post-mumps—both in the sycotic matrix [Clarke], [Hughes]. Thermal state: seeks warmth; cold drafts and cold inhaled air are enemies; warm humidity is a friend—this aligns with the Better warm drink, Better warm room modalities. Reactivity is high (spasm) in the dry stage, then shifts to secretory (Hepar) if unchecked. Differential pace: Samb. suffocates in silence with profuse sweat; Dros. paroxysms have gagging without sawing; Brom. tends to membranous obstruction with cyanosis; Kali-br. yields loose, rattling croup later; Phos. has laryngeal pain and haemorrhagic tendency but craves cold (opposite) [Farrington], [Kent]. Clinical progress is marked by: (1) first sleep unbroken, (2) inspiration quietens, (3) voice holds, (4) child tolerates lying—the Spong. state is then receding.

Croup / Laryngotracheitis

• Aconitum — First stage: high fever, burning restlessness, fear of death; cough may be dry but less sawing; often precedes Spong. [Boger], [Farrington].
• Hepar sulph. — Later: rattling, moist, exquisitely sensitive, slightest draft provokes; wants very warm; Spong.: dry, sawing, mid-stage. [Kent], [Hering].
• Bromium — Membranous croup: rattling, cyanosis, suffocation on entering warm room; Spong.: prefers warmth, no marked membrane picture. [Farrington].
• Sambucus — After-midnight spells, profuse sweat, almost silent closure; Spong.: barking, crowing noise. [Kent].
• Drosera — Deep spasmodic whoop-like cough, gagging/vomiting, worse after midnight; not especially better warm drinks; no sawing inspiration. [Farrington].
• Kali-bich. — Tough ropy mucus, stringy expectoration; Spong.: dry stage before secretion. [Clarke].
• Phosphorus — Laryngeal pains, haemorrhagic tendency, craves cold drinks (opp. Spong.); voice husky but respiration less sawing. [Kent].

Cardiac / Valvular

• Digitalis — Slow, intermittent pulse, nausea from least motion, organ-fear to move; Spong.: laryngo-cardiac cough, sawing breath, thyroid throbbing. [Farrington], [Kent].
• Cactus — “Iron band,” constriction, congestive headache; Spong.: choking in throat with laryngeal dryness; warmth helps. [Kent].
• Spigelia — Knife-like left chest/arm pains; palpitation; less laryngeal picture. [Farrington].
• Aurum — Hypertrophy, depression; not a dry laryngeal spasm leader. [Kent].

Thyroid / Goitre

• Iodum — Emaciation with ravenous hunger, heat, anxiety; craves cold air; Spong.: better warmth, dry larynx; both goitrous. [Clarke], [Hughes].
• Bromium — Left-sided glandular enlargement, hard, stony; laryngeal catarrh worse warm room; Spong. prefers warmth. [Farrington].
• Lycopus — Functional hyperthyroid tachycardia; little laryngeal dryness. [Clarke].

Hoarseness / Voice strain

• Arum-t. — Acrid coryza, picking nose, voice loss; Spong.: dry larynx, better warm drinks. [Allen].
• Causticum — Raw voice, better cold drinks (opp. Spong.); chronic paresis. [Kent].
• Phosphorus — Over-use voice, burning; craves cold; bleeding. [Kent].

Orchitis / Induration

• Clematis — Spermatic cord pains, swelling, sensitive to touch; Spong. when hardness and dry spasm temperament coexist. [Farrington].
• Rhododendron — Testicular pains before storms; Spong.: less weather-linked, more induration. [Clarke].
• Pulsatilla — Mild, weepy, shifting; likes open cool air (opp. Spong.). [Kent].

• Complementaries: Acon. (ushers in; clears hot panic so the dry sawing stage emerges) [Boger]; Hepar (follows Spong. when secretion appears) [Hering]; Iodum/Bromium (glandular/thyroid adjuncts per thermal craving) [Clarke].
• Follows well: Bell. in acute laryngitis when delirious heat subsides to dry larynx [Kent]; Ars. when burning anxiety yields to local dryness but cold air aggravates.
• Precedes well: Hepar (transition to moist); Kali-bich. (stringy expectoration stage); Phos. (laryngeal erosions).
• Compatible: Ant-t. (when rattling supervenes); Dros. (residual paroxysms without dryness).
• Antidotal (functional): Cold air is inimical; warm room, warm drinks synergise with its direction.
• Inimical: None emphasised; avoid rotating with Brom. on mere similarity unless thermal modalities line up.

• Croup ladder: Acon. (feverish onset) → Spong. (dry, sawing, better warm drinks) → Hepar (rattling, sensitive). Do not wait for rattling if the sawing is present; dose 200C or 30C in quick repetition until the first sleep passes unbroken [Boger], [Hering], [Farrington].
• Performer’s laryngitis: Spong. 30C before performance; sip warm water between sets; strict no cold air/ice exposure; compare Phos./Caust. by drink preference [Allen], [Kent].
• Cardio-laryngeal reflex: In valvular murmurs with laryngeal dry cough and thyroid throbbing, Spong. intercurrently settles the cough; then address the myocardium (e.g., Crataegus, Digitalis) as needed [Farrington], [Clarke].
• Goitre with choking: Spong. in low to medium potencies over weeks; thermal guidance (better warmth) differentiates from Iod. (hot, hungry, likes cold) and Brom. (worse warm room) [Clarke], [Hughes].
• Post-mumps orchitis: Spong. 30C–200C for hard, indurated testes with drawing cord pains; warm support; compare Clem., Rhod., Puls. by temperament [Hering], [Farrington].
• Pearl cases

• • Child, 10 p.m., bolt upright, crowing inspiration, barking cough, instantly better from warm milk → Spong. 200C; slept through thereafter [Hering].
  • Singer with dry, leather-like voice, cough on inspiration, relieved by warm drinks → Spong. 30C t.i.d. for a week; voice serviceable [Allen].
  • Goitre with throbbing thyroid, choking on collars, prefers warmth → Spong. 6C b.i.d.; follow with Iod. if heat/hunger picture emerges [Clarke].

Mind

• Mind — FEAR — suffocation — on waking from first sleep (night terrors of choking) — organ-driven anxiety. [Hering], [Kent].
• Mind — ANXIETY — with palpitation and choking in throat — cardio-laryngeal link. [Farrington], [Clarke].
• Mind — STARTS — from sleep — grasps throat. [Hering].
• Mind — AVERSION to be laid down — wants to be held erect. [Hering].

Head / Face / Neck

• Head — THROBBING — carotids — with dyspnoea. (Thyroid-carotid synergy.) [Clarke].
• Face — FLUSHED — during cough paroxysm; pallor after. [Hering].
• Neck — GOITRE — throbbing — choking on collars. (Thyroid keynote.) [Clarke], [Hughes].

Voice / Throat / Larynx

• Voice — HOARSENESS — aphonia — morning, improves during day. [Allen].
• Larynx — DRYNESS — extreme — as if a plug. (Cardinal.) [Hering].
• Larynx — SPASM — CROWING inspiration — SAWING respiration. (Pathognomonic.) [Boger], [Hering].
• Throat — WARM DRINKS — ameliorate cough/hoarseness. (Master modality.) [Boericke].
• Cough — BARKING, croupy, worse before midnight, worse inspiration. [Hering], [Farrington].

Respiration / Chest

• Respiration — CROWING — during inspiration — croup. [Hering].
• Respiration — WORSE LYING, BETTER SITTING UP. (Positional.) [Farrington].
• Chest — OPPRESSION — raw, dry feeling behind sternum. [Allen].
• Whooping-cough — paroxysms with crowing inspiration; better warm drinks. [Clarke].

Heart

• Heart — PALPITATION — with suffocation, must sit up. [Farrington], [Clarke].
• Heart — SOUNDS — loud, rough murmurs — valvular disease. [Boger].
• Pulse — THROBBING — carotids/thyroid. [Clarke].

Male

• Testes — INDURATION, orchitis — post-mumps — better warmth. [Hering], [Farrington].
• Spermatic cord — PAINS — drawing up into ring. [Clarke].

Generalities / Modalities

• Generalities — COLD AIR — aggravates; WARMTH — ameliorates. (Global.) [Phatak], [Clarke].
• Generalities — EATING/DRINKING warm — ameliorates cough. (Cross-system.) [Hering], [Boericke].
• Sleep — FIRST SLEEP — aggravation. (Croup clock.) [Hering], [Boger].

Hahnemann — Materia Medica Pura & Chronic Diseases (1821–1834): proving elements—laryngeal dryness, barking cough, nocturnal suffocation.
Hering, C. — The Guiding Symptoms of Our Materia Medica (1879): classic sawing/crowing picture, first-sleep aggravation, warm-drink amelioration; croup chronology.
Allen, T. F. — Encyclopaedia of Pure Materia Medica (1874–79): laryngeal dryness, hoarseness, aphonia; modalities; cardiac notes.
Clarke, J. H. — A Dictionary of Practical Materia Medica (1900): thyroid/goitre, carotid–thyroid throbbing, orchitis, performer’s hoarseness; sea-air and iodic context.
Hughes, R. — A Manual of Pharmacodynamics (1870s): iodine/bromine rationale; glandular tropism; comparisons with Iod., Brom., Hepar.
Boericke, W. — Pocket Manual of Homoeopathic Materia Medica (1901): keynotes—warm drinks relieve, worse cold air, barking croup, testicular induration.
Boger, C. M. — Synoptic Key (1915): Acon.→Spong.→Hepar croup ladder; sawing inspiration; positional modalities.
Farrington, E. A. — Clinical Materia Medica (1887): differentials (Brom., Dros., Samb., Phos.); cardio-laryngeal links; thyroid notes.
Kent, J. T. — Lectures on Homoeopathic Materia Medica (1905): mental picture (air-hunger, first-sleep starts); thermal modalities; croup staging.
Phatak, S. R. — Materia Medica of Homoeopathic Medicines (1977): terse generals—better warmth, worse cold air; laryngeal core.
Tyler, M. L. — Homoeopathic Drug Pictures (1942): vivid clinical portraits—barking child, warm milk test, goitre choking.
H. C. Allen — Keynotes and Characteristics (1898): condensed croup keynotes—barking, worse before midnight, better warm drinks.