It produces caries of the long bones, with thin and excoriating discharges, relieved by cold applications. Dental fistulæ and bone felons, with offensive discharges.

Roughness and harshness of the skin, with great itching in spots ; worse from warmth and better from cold.

It follows Silicea well, and is especially useful after the abuse of Silicea in suppurations. Silicea is relieved by warmth. Fluoric acid by cold.

MURIATICUM ACIDUM
 

The acid of Chlorine or Hydrochloric acid.

This acid acts upon the ganglionic system and through it upon the blood, skin and alimentary tract ; it increases the coagulability of the blood and renders it prone to disorganization, hence its application in low dynamic conditions, putrid fevers, etc.

Characteristics
 Great general debility.
 The dry tongue rattling in the mouth.
 Offensive discharges.
 Aversion to food.
 Tendency to involuntary evacuations.

Debility is general, and so great that the patient slips down to the foot of the bed and must be lifted up every little while, inability to void the urine unless the bowels move.

Muriatic acid in typhoid fever  low dynamic conditions, putrid fevers, etc.
The tongue is dry and rattles in the mouth, there is a watery diarrhœa, which is often involuntary while urinating ; the patient is so weak that he slides down toward the foot of the bed ; there is dropping of the lower jaw and cold extremities, the heart is feeble, irregular and intermits every third beat, bedsores, etc.

 Nitric Acid is an acid combination of Nitrogen, Oxygen and Hydrogen (HNO3).

The mucous membranes, especially at the outlets of the body where they join the skin, is the principal seat of action of this remedy. It produces irritation and destructive ulcerations, going on even to gangrene ; it also acts on the glands and bones.

Characteristics
Offensive, excoriating discharges.
Splinter-like pains.
Discharges have a urinous odor.
Ulcerations at junction of skin and mucous membranes.

Nasal symptoms
Offensive excoriating discharge from the nose, accompanied by nosebleed and offensive odor, hard plugs in the nose, which detached, leave a raw surface.
Syphilitic ozæna.

Throat symptoms
Sensation of a splinter, fishbone or piece of glass in the throat, ulcers in the throat with offensive discharges and odor.

Ulceration
The ulcers are irregular, deep and filled with exuberant granulations, bleed on slightest touch, have sticking pains in them and burn violently.
They are fetid, exude a greenish fluid, and are worse from cold water.
To recapitulate :
They have ragged, zigzag edges, often raised.
Are apt to granulate profusely, proud flesh.
Vascular, bleeding easily.
Sharp splinter-like pains in them.

Diarrhœa
The stools are offensive, green and putrid, and are accompanied by a great deal of straining and soreness about the anus ; fissure and ulceration about the anus.

Urinary symptoms
The urine smells as strong as a horse's urine ; burning, tenesmus, and a sensation as if sticks were in the urethra when urinating.

Nitric acid in syphilis
Secondary syphilis ; phagedenic chancres ; soreness of the skin and cranial bones, worse from damp weather ; ulcers in the throat, irregular in outline ; yellowish-brown or copper-colored spots over the body.

Nitric acid antidotes Mercury - the restlessness, mental anxiety, periosteal pains, the ophthalmia, ptyalism, ulceration of the mouth and throat, and the caries of bone .

Cough
Dry, tickling cough, worse at night on first lying down and often starting from a particular spot in the larynx. Little or no expectoration but great physical depression.

Phthisis 
Difficult, green purulent expectoration ; night sweats ; soreness of the chest ; hectic ; hæmorrhage ; dyspnœa and hoarseness, worse in the morning. Stitching through right chest to scapula, the sweats are particularly exhausting. Diarrhœa worse evenings. Worse in warm weather.

Calcarea carbonica compared
Pale, light complexion, painless hoarseness, the chest soreness is worse from touch or pressure, dyspnœa and dizziness on going upstairs, morning diarrhœa, and a loose and rattling cough are the characteristics of Calcarea ; white thin, dark complexion, stinging hoarseness, chest soreness not worse from touch or pressure, palpitation and intermittent pulse on going up stairs, evening diarrhœa, and tight dry cough are the characteristics of Nitric acid. Worse in cold weather is characteristic of Calcarea.

Typhoid fever 
When the stools are green, offensive and slimy, with hæmorrhage from the bowels ; fainting from least movement ; threatened paralysis of the lungs, rattling breathing and intermittent pulse.

General differences between mineral and vegetable acids
Mineral acids produce a scorbutic state of the system ; with manifest tendency to ulcers and low forms of disease - typhoid diseases.
Vegetable acids cause great debility, but in a less degree than mineral acids and they show a tendency to the production of a membrane in the throat.

It produces nervous prostration and debility ; an atonic condition of the gastro-intestinal tract ; and bone affections.

Characteristics
Debility from nervous causes.
Painless, watery, non-exhausting diarrhœa.
Ailments from sexual excesses.

Debility
It is a nervous debility, arising from continued grief, over-exertion of mind, sexual excess or any nervous strain on the body ; it is characterized by indifference, apathy, and torpidity of body and mind.

Diarrhœa
It is watery, painless, oftentimes undigested diarrhœa, preceded by rumbling in the bowels, and despite the frequency of the stool the patient does not seem weakened by it ; the keynotes are absence of pain and absence of exhaustion.
Diarrhœa from fear.
The essentials are :
Rumbling in the abdomen.
Perspiration of whole body.
Thin watery painless stools.
Much thirst.

Effects of grief
Bad effects of grief due to depressing emotions, disappointed love, and also for homesickness.
Pain on vertex as if crushed, is a valuable symptom.

Ignatia compared
Ignatia is more for the immediate effects, while Phosphoric acid is more for the chronic, long lasting effects, coming in after Ignatia.

Diabetes
Glycosuria and Polyuria, urine looks milky or like jelly after standing ; great debility ; cough on slightest exposure ; bruised feeling in muscles and burning in the spine ; urine loaded with phosphates showing a greasy pellicle. Especially in diabetes of nervous origin, urine contains much sugar, cases due to grief, worriment and anxiety, loss of appetite, thirst, boils, indifferent and apathetic.

Uranium nitricum in diabetes 
Emaciation, excessive thirst, vomiting of food with excessive urine ; sometimes tympanites. Diabetes originating in dyspepsia or due to assimilative derangements.

Male sexual symptoms
Debility, relaxation or impotence from sexual excesses, frequent weak emissions and dragging pains in the testicles ; weakness in back and legs and burning spine ; spermatorrhœa.

Chest
It produces weakness of the chest so that the patient can hardly talk ; the weakness causes dyspnœa ; cough from tickling in the chest about the ensiform cartilage, worse in the evening on lying down.

Its acts especially upon mucous tissues, alimentary canal and the respiratory tract.

Stomach
Extreme sourness of all vomited matters ; the stomach feels cold and relaxed, and the patient desires stimulating drink, such as brandy ; the stomach is so weak that all food is vomited. Stomach troubles of inebriates with these symptoms are greatly benefited by the remedy.

Debility
As a tremor ; there is a sense of tremor accompanied by objective trembling ; it is a debility which occurs at the change of life or in drunkards.

A sensation as if the white of an egg had dried on the face.

There is a white membrane in the throat ; and it looks as if it were whitewashed.

In dropsies, standing midway between Arsenic and Apis, distinguished from both in the characteristic thirst, and the predominance of the gastric symptoms. Dropsies about lower limbs and abdomen with waxen emaciated, alabaster skin and great debility.

When the patient is passing large quantities of pale urine accompanied by intense thirst, dry, hot skin and great debility.

In convulsions simulating epilepsy, tetanus, with stiffness about the jaws and neck ; another symptom indicating its use is a gurgling which extends from the throat to the stomach when swallowing. It suits especially recent cases. It has also been used in the dry, hacking cough of consumptives (Laurocerasus which probably contains Hydrocyanic acid).

It is an organic acid compound of Nitric acid and a member of the Phenol series.

It corresponds in general to symptoms of neurasthenia or brain fag. It also has a marked action on the sexual organs. It has power of disintegrating the blood, and of destroying the properties of the red blood corpuscles.

Neurasthenia
Depression and weariness from slight fatigue, a mental inactivity with indifference and a desire to lie down and rest : brain fag ; the grand characteristic is that the slightest exertion brings on speedy exhaustion, and extinguishes that quality which we call grit.

Sexual symptoms
Excitement, priapism and profuse emissions, erections very violent, legs are heavy ; there is prostration from least exertion ; erections keep the patient awake at night.
The higher potencies are better than the lower here.

Dyspepsia with excessive accumulation of flatulence and acidity of the stomach ; much belching of gas. Burning canker sores in the mouth, Ménière's disease, vertigo, roaring in ears and deafness.

Backache
Acute pain in the back extending down the thighs, relieved by change of posture, the back feels too weak to support the body, the pains are worse when thinking of them. Symptoms intermit. Multiple sclerosis with lancinating pains like electric shocks, tremor of limbs, or for the fulgurating pains of posterior spinal sclerosis. There are numb sensations.

Under Picric acid the sensation in the limbs is one of heaviness rather than of numbness.

Indications for Oxalic acid
Pain in spots over the body.
Neuralgia of the spermatic cord, worse from motion.
Excessive hyperæsthesia of the retina.

Urinary symptoms of Benzoic acid
Irritable bladder, with dribbling of strong-smelling urine ; it is high colored and of a very offensive ammoniacal odor, like that of the horse.

Benzoic acid in rheumatism 
Pain in the small joints, with this strong smelling urine ; gouty nodosities ; weeping sinews.

Flatulence of the aged depending upon imperfect digestion ; acidity and burning in the stomach.

Diabetes
Urinates copiously and freely. Saccharine urine, great thirst, nausea, debility, voracious appetite and constipation. The gastro-hepatic variety is especially benefited by Lactic acid.