To be good, nitrum should be very fine, and extremely spongy and porous. In Egypt, it is sophisticated with lime, an adulteration easily detected[3206] by tasting it; for when pure, it liquefies immediately, while that which has been adulterated, remains undissolved sufficiently long to leave a pungent taste[3207] in the mouth. It is burnt in a close earthen vessel, as otherwise it would decrepitate:[3208] except in this last case, however, the action of fire does not cause it to decrepitate. This substance neither produces nor nourishes anything; while, in the salt-pans, on the other hand, we see plants growing, and the sea, we know, produces immense numbers of animated beings, though, as to plants, sea-weed only. It is evident, too, that the acridity[3209] of nitrum must be much greater than that of salt, not only from the fact last mentioned, but from the circumstance also, that at the nitre-beds the shoes wear out with the greatest rapidity; localities which are otherwise very healthy, and remarkably beneficial for the eye-sight. At the nitre-works ophthalmia is a thing unknown: persons, too, that come there with ulcers upon them experience a rapid cure; though ulcerations formed upon the spot are but slow in healing. Used as a friction with oil, nitrum is a sudorific, and acts emolliently upon the body. That of Chalastra is used as a substitute for salt, in making bread,[3210] and the Egyptian nitrum is eaten[3211] with radishes,[3212] it having the effect of making them more tender; though as to other edibles it turns them white and spoils them. To vegetables it imparts an additional greenness.[3213]
Viewed medicinally, nitrum is calorific, attenuant, mordent, astringent, desiccative, and ulcerating: it is good, too, in all cases where certain humours require to be drawn out or dispersed, or where gentle mordents or attenuants are required, as in the case of pustules and pimples, for example. Some persons ignite it for this purpose, and, after quenching it in astringent wine, bruise and use it, without oil, at the bath. Applied with dried iris powdered, and green olive oil, it checks immoderate perspiration. Applied topically with a fig, or boiled down to one half in raisin wine, it removes marks upon the eyes and granulations of the eyelids. It is used, also, for the removal of argema, boiled in a pomegranate rind with raisin wine. Used as an ointment, in combination with honey, it improves the eye-sight. It is very useful, also, for tooth-ache, taken as a collutory with wine and pepper, or boiled with a leek. Burnt, and employed as a dentifrice, it restores teeth[3214] to their original colour that have turned black; and an application of it, with Samian earth and oil, kills nits and other vermin of the head. Dissolved in wine, it is used as an injection for suppurations of the ears, and, applied with vinegar, it consumes filth that has accumulated there. Introduced dry into the ears, it disperses singings and tinglings in those organs.
Applied topically, in the sun, with an equal quantity of Cimolian[3215] chalk dissolved in vinegar, it removes white morphew; and a mixture of it with resin, or with white raisins—the stones being beaten up as well—is an excellent cure for boils. It is useful, also, for inflammations of the testes; and, in combination with axle-grease, for pituitous eruptions on all parts of the body. For the cure of bites inflicted by dogs, it is used with resin, the application being made at first with vinegar. With lime and vinegar, it is used as a liniment for stings inflicted by serpents, as, also, for ulcerations, whether phagedænic, putrid, or serpiginous; in cases, too, of dropsy, it is employed both internally and externally, beaten up with figs. Taken internally as a decoction, in doses of one drachma, with rue, dill, or cummin, it effectually removes griping pains in the bowels. An external application of it, with oil and vinegar, is highly refreshing to persons exhausted with fatigue; and it is equally beneficial for shudderings and cold shiverings, the feet and hands of the patient being well rubbed with it, mixed with oil. It allays the itching sensations attendant upon jaundice, more particularly when it is administered to the patient while perspiring, with vinegar. Taken internally in oxycrate, it is an antidote to the poison of fungi; and, taken with water, it acts beneficially, as an emetic, in cases where the buprestis has been swallowed.
To persons who have taken bull’s blood,[3216] nitrum is administered, in combination with laser.[3217] Mixed with honey and cow’s milk, it is curative of ulcers upon the face. For the cure of burns, it is applied pounded, being first parched till it turns black. For pains in the bowels and kidneys, and for rigidities of the limbs and pains in the sinews, it is used in the form of an injection. For the cure of paralysis of the tongue, it is applied to that organ with bread, and to asthmatic patients it is administered in a ptisan. Flower of nitrum, used in combination with equal proportions of galbanum and turpentine respectively, is curative of chronic coughs; the mixture being taken in pieces the size of a bean. Nitrum[3218] itself, boiled and melted with tar, is given to patients to swallow, for quinzy.
Flower of nitrum, mixed with oil of cyprus,[3219] and applied in the sun, is a soothing liniment for pains in the joints. Taken internally with wine, it is curative of jaundice. It acts as a carminative also; and it arrests bleeding at the nose, the vapour of it in boiling water being inhaled by the patient. Mixed with alum, it removes porrigo; and, used daily with water, as a fomentation, it removes offensive odours of the armpits. Used in combination with wax, it heals ulcers produced by pituitous secretions, and, similarly employed, it is very useful for affections of the sinews. For the cure of the cœliac flux, it is used in the form of an injection. Many authorities recommend the use of it, with oil, as a friction when cold shiverings are just coming on; as also, for the removal of leprous spots and freckles. It is a good plan also, to use a sitting-bath made with an infusion of nitrum, for the cure of gout, atrophy, opisthotony, and tetanus.
Both salt and nitre, boiled with sulphur,[3220] become petrified.
CHAP. 47. (11.)—SPONGES, AND THE REMEDIES DERIVED FROM THEM: NINETY-TWO OBSERVATIONS THEREON.
We have already,[3221] when speaking of the marine productions, described the various kinds of sponge. Some authorities make the following distinctions: they regard as males[3222] those sponges which are pierced with more diminutive holes, are more compact in form and more ready to imbibe, and are stained, to satisfy luxurious tastes, in various colours, sometimes purple even: those, on the other hand, which have holes, larger and running into one another, they consider to be females. Among the male sponges, too, there is one kind, harder than the others, the name given to which is “tragi,”[3223] and the holes of which are extremely small and numerous. Sponges are made white artificially; the softest being chosen for the purpose, and after they have been steeped the whole summer through with the foam of the sea. They are then exposed to the action of the moon and hoar-frosts, being turned upside down, or, in other words, with that part upwards by which they formerly adhered to the rocks, the object being that they may become white throughout.
That sponges are animated beings, we have already stated; and not only this, but they have a coat of blood[3224] even, adhering to them. Some say that they regulate their movements by the sense of hearing, and that at the slightest noise they contract themselves, and emit an abundant moisture: when such is the case, it is said, it is impossible to tear them away from the rocks, and consequently they must be cut, an operation during which they emit a sanious secretion. Those sponges, too, are preferred to all others, which are grown on spots with a north-east aspect, the physicians assuring us that these retain the breath of life the longest of all; a circumstance which renders them additionally useful to the human body, from the union which is thereby effected of their vital principle with our own.[3225] It is for this reason, too, that they are preferred as fresh as possible, and in a moist state rather than dry. They are not so useful, however, if applied with hot water,[3226] and still less so if they are oiled, or applied to the body when just anointed. The compact sponges, it is thought, have less adhesive power than the others.
The softest kind of sponge are those employed for tents.[3227] Applied with honied wine, sponges reduce swellings of the eyes, and are extremely useful for the removal of rheum from those organs, the very finest and softest being of necessity selected for the purpose. Sponges are applied, also, with oxycrate, to defluxions of the eyes, and, with warm vinegar, for head-ache. In addition to these properties, fresh sponges are resolvent, emollient, and soothing; but when old, they lose their healing properties for wounds. They are employed, also, in medicine, for cleansing sores, and for either fomenting or covering the parts fomented, till some other application is made. Applied topically, they have a healing effect upon running ulcers, and upon sores on the bodies of aged persons. Fractures, too, and wounds are most effectually fomented with sponge; and when surgical operations are performed, it instantly absorbs the blood, so as to allow the incision to be seen. Sponges are applied, also, as a bandage, to inflamed wounds, sometimes dry, and, in some cases, moistened with vinegar, wine, or cold water. Soaked in rain-water, and applied to the incision, they prevent cuts recently inflicted from swelling. They are used as an application for such parts of the body, though apparently uninjured, as are threatened with occult humours which require to be dispersed; as also for reducing the tumours known to us as “apostemes,” the parts being first fomented with a decoction of honey. Sponges are employed, also, for affections of the joints, steeped in vinegar and salt, or in oxycrate: in cases, however, where the attack is attended with fever, water alone is used with the sponge. Soaked in salt and water, sponges are applied to callosities; and, with vinegar, they are used for stings inflicted by scorpions.