There is also a kind of spodos, called “lauriotis,” which is made in the furnaces where silver is smelted. The kind, however, that is best for the eyes, it is said, is that produced in the furnaces for smelting gold. Indeed there is no department of art in which the ingenuity of man is more to be admired; for it has discovered among the very commonest objects, a substance that is in every way possessed of similar properties.
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CHAP. 35.
FIFTEEN VARIETIES OF ANTISPODOS.
The substance called “antispodos” is produced from the ashes of the fig-tree or wild fig, or of leaves of myrtle, together with the more tender shoots of the branches. The leaves, too, of the wild olive furnish it, the cultivated olive, the quince-tree, and the lentisk; unripe mulberries also, before they have changed their colour, dried in the sun; and the foliage of the box, pseudo-cypirus, bramble, terebinth and œnanthe. The same virtues have also been found in the ashes of bull-glue and of linen cloth. All these substances are burnt in a pot of raw earth, which is heated in a furnace, until the earthenware is thoroughly baked.
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CHAP. 36.
SMEGMA.
In the copper forges also smegma is prepared. When the metal is liquefied and thoroughly smelted, charcoal is added to it and gradually kindled; after which, upon it being suddenly acted upon by a powerful pair of bellows, a substance is disengaged like a sort of copper chaff. The floor on which it is received ought to be prepared with a stratum of coal-dust.
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CHAP. 37.
DIPHRYX.
There is another product of these furnaces, which is easily distinguished from smegma, and which the Greeks call “diphryx,” from its being twice calcined. This substance is prepared from three different sources. It is prepared, they say, from a mineral pyrites, which is heated in the furnace until it is converted by calcination into a red earth. It is also made in Cyprus, from a slimy substance extracted from a certain cavern there, which is first dried and then gradually heated, by a fire made of twigs. A third way of making it, is from the residue in the copper-furnaces that falls to the bottom. The difference between the component parts of the ore is this; the copper itself runs into the receivers, the scoriæ make their escape from the furnace, the flower becomes sublimated, and the diphryx remains behind.
Some say that there are certain globules in the ore, while being smelted, which become soldered together; and that the rest of the metal is fused around it, the mass itself not becoming liquefied, unless it is transferred to another furnace, and forming a sort of knot, as it were, in the metal. That which remains after the fusion, they say, is called “diphryx.” Its use in medicine is similar to that of the substances mentioned above; it is desiccative, removes morbid excrescenses, and acts as a detergent. It is tested by placing it on the tongue, which ought to be instantly parched by it, a coppery flavour being perceptible.
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CHAP. 38.
PARTICULARS RELATIVE TO THE SERVILIAN TRIENS.
We must not neglect to mention one other very remarkable fact relative to copper. The Servilian family, so illustrious in our annals, nourishes with gold and silver a copper triens, which devours them both. The origin and nature of this coin is to me incomprehensible; but I will quote the very words of the story, as given by old Messala himself— “The family of the Servilii is in possession of a sacred triens, to which they offer every year a sacrifice, with the greatest care and magnificence; the triens itself, they say, appears sometimes to increase in size and sometimes to diminish; changes which indicate the coming advancement or decadence of the family.”
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CHAP. 39. (14).
IRON ORES.
Next to copper we must give an account of the metal known as iron, at the same time the most useful and the most fatal instrument in the hand of mankind. For by the aid of iron we lay open the ground, we plant trees, we prepare our vineyard-trees, and we force our vines each year to resume their youthful state, by cutting away their decayed branches. It is by the aid of iron that we construct houses, cleave rocks, and perform so many other useful offices of life. But it is with iron also that wars, murders, and robberies are effected, and this, not only hand to hand, but from a distance even, by the aid of missiles and winged weapons, now launched from engines, now hurled by the human arm, and now furnished with feathery wings. This last I regard as the most criminal artifice that has been devised by the human mind; for, as if to bring death upon man with still greater rapidity, we have given wings to iron and taught it to fly. Let us there- fore acquit Nature of a charge that here belongs to man himself.
Indeed there have been some instances in which it has been proved that iron might be solely used for innocent purposes. In the treaty which Porsena granted to the Roman people, after the expulsion of the kings, we find it expressly stipulated, that iron shall be only employed for the cultivation of the fields; and our oldest authors inform us, that in those days it was considered unsafe to write with an iron pen. There is an edict extant, published in the third consulship of Pompeius Magnus, during the tumults that ensued upon the death of Clodius, prohibiting any weapon from being retained in the City.
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CHAP. 40.
STATUES OF IRON; CHASED WORKS IN IRON.
Still, however, human industry has not failed to employ iron for perpetuating the honours of more civilized life. The artist Aristonidas, wishing to express the fury of Athamas subsiding into repentance, after he had thrown his son Learchus from the rock, blended copper and iron, in order that the blush of shame might be more exactly expressed, by the rust of the iron making its appearance through the shining substance of the copper; a statue which still exists at Rhodes. There is also, in the same city, a Hercules of iron, executed by Alcon, the endurance displayed in his labours by the god having suggested the idea. We see too, at Rome, cups of iron consecrated in the Temple of Mars the Avenger, Nature, in conformity with her usual benevolence, has limited the power of iron, by inflicting upon it the punishment of rust; and has thus displayed her usual foresight in rendering nothing in existence more perishable, than the substance which brings the greatest dangers upon perishable mortality.
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CHAP. 41.
THE DIFFERENT KINDS OF IRON, AND THE MODE OF TEMPERING IT.
Iron ores are to be found almost everywhere; for they exist even in the Italian island of Ilva, being easily distinguished by the ferruginous colour of the earth. The method of working the ore is the same as that employed in the case of copper. In Cappadocia, however, it is peculiarly questionable whether this metal is a present due to the water or to the earth; because, when the latter has been saturated with the water of a certain river, it yields, and then only, an iron that may be obtained by smelting.
There are numerous varieties of iron ore; the chief causes of which arise from differences in the soil and in the climate. Some earths produce a metal that is soft, and nearly akin to lead; others an iron that is brittle and coppery, the use of which must be particularly avoided in making wheels or nails, the former kind being better for these purposes. There is another kind, again, which is only esteemed when cut into short lengths, and is used for making hobnails; and another which is more particularly liable to rust. All these varieties are known by the name of “strictura,” an appellation which is not used with reference to the other metals, and is derived from the steel that is used for giving an edge. There is a great difference, too, in the smelting; some kinds producing knurrs of metal, which are especially adapted for hardening into steel, or else, prepared in another manner, for making thick anvils or heads of hammers. But the main difference results from the quality of the water into which the red-hot metal is plunged from time to time. The water, which is in some places better for this purpose than in others, has quite ennobled some localities for the excellenc
e of their iron, Bilbilis, for example, and Turiasso in Spain, and Comum in Italy; and this, although there are no iron mines in these spots.
But of all the different kinds of iron, the palm of excellence is awarded to that which is made by the Seres,who send it to us with their tissues and skins; next to which, in quality, is the Parthian iron. Indeed, none of the other kinds of iron are made of the pure hard metal, a softer alloy being welded with them all. In our part of the world, a vein of ore is occasionally found to yield a metal of this high quality, as in Noricum for instance; but, in other cases, it derives its value from the mode of working it, as at Sulmo, for example, a result owing to the nature of its water, as already stated. It is to be observed also, that in giving an edge to iron, there is a great difference between oil-whetstones and water-whetstones, the use of oil producing a much finer edge. It is a remarkable fact, that when the ore is fused, the metal becomes liquefied like water, and afterwards acquires a spongy, brittle texture. It is the practice to quench smaller articles made of iron with oil, lest by being hardened in water they should be rendered brittle. Human blood revenges itself upon iron; for if the metal has been once touched by this blood it is much more apt to become rusty.
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CHAP. 42.
THE METAL CALLED LIVE IRON.
We shall speak of the loadstone in its proper place, and of the sympathy which it has with iron. This is the only metal that acquires the properties of that stone, retaining them for a length of time, and attracting other iron, so that we may sometimes see a whole chain formed of these rings. The lower classes, in their ignorance, call this “live iron,” and the wounds that are made by it are much more severe. This mineral is also found in Cantabria, not in continuous strata, like the genuine loadstone, but in scattered fragments, which they call “bullationes.” I do not know whether this species of ore is proper also for the fusion of glass, as no one has hitherto tried it; but it certainly imparts the same property as the magnet to iron. The architect Timochares began to erect a vaulted roof of loadstone, in the Temple of Arsinoë, at Alexandria, in order that the iron statue of that princess might have the appearance of hanging suspended in the air: his death, however, and that of King Ptolemæus, who had ordered this monument to be erected in honour of his sister, prevented the completion of the project.
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CHAP. 43. (15.)
METHODS OF PREVENTING RUST.
Of all metals, the ores of iron are found in the greatest abundance. In the maritime parts of Cantabria which are washed by the Ocean, there is a steep and lofty mountain, which, however incredible it may appear, is entirely composed of this metal, as already stated in our description of the parts bordering upon the Ocean
Iron which has been acted upon by fire is spoiled, unless it is forged with the hammer. It is not in a fit state for being hammered when it is red-hot, nor, indeed, until it has begun to assume a white heat. By sprinkling vinegar or alum upon it, it acquires the appearance of copper. It is protected from rust by an application of ceruse, gypsum, and tar; a property of iron known by the Greeks as “antipathia.” Some pretend, too, that this may be ensured by the performance of certain religious ceremonies, and that there is in existence at the city of Zeugma, upon the Euphrates, an iron chain, by means of which Alexander the Great constructed a bridge across the river; the links of which that have been replaced are attacked with rust, while the original links are totally exempt from it.
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CHAP. 44.
SEVEN REMEDIES DERIVED FROM IRON.
Iron is employed in medicine for other purposes besides that of making incisions. For if a circle is traced with iron, or a pointed weapon is carried three times round them, it will preserve both infant and adult from all noxious influences: if nails, too, that have been extracted from a tomb, are driven into the threshold of a door, they will prevent night-mare. A slight puncture with the point of a weapon, with which a man has been wounded, will relieve sudden pains, attended with stitches in the sides or chest. Some affections are cured by cauterization with red-hot iron, the bite of the mad dog more particularly; for even if the malady has been fully developed, and hydrophobia has made its appearance, the patient is instantly relieved on the wound being cauterized. Water in which iron has been plunged at a white heat, is useful, as a potion, in many diseases, dysentery more particularly.
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CHAP. 45.
FOURTEEN REMEDIES DERIVED FROM RUST.
Rust itself, too, is classed among the remedial substances; for it was by means of it that Achilles cured Telephus, it is said, whether it was an iron weapon or a brazen one that he used for the purpose. So it is, however, that he is represented in paintings detaching the rust with his sword. The rust of iron is usually obtained for these purposes by scraping old nails with a piece of moistened iron. It has the effect of uniting wounds, and is possessed of certain desiccative and astringent properties. Applied in the form of a liniment, it is curative of alopecy. Mixed with wax and myrtle-oil, it is applied to granulations of the eyelids, and pustules in all parts of the body, with vinegar it is used for the cure of erysipelas; and, applied with lint, it is curative of itch, whitlows on the fingers, and hang-nails. Used as a pessary with wool, it arrests female discharges. Diluted in wine, and kneaded with myrrh, it is applied to recent wounds, and, with vinegar, to condylomatous6 swellings. Employed in the form of a liniment, it alleviates gout.
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CHAP. 46.
SEVENTEEN REMEDIES DERIVED FROM THE SCALES OF IRON. HYGREMPLASTRUM.
The scales of iron, which are procured from a fine point or a sharp edge, are also made use of, being very similar in effect to rust, but more active; for which reason they are employed for defluxions of the eyes. They arrest bleeding, also, more particularly from wounds inflicted with iron; and they act as a check upon female discharges. They are applied, too, for diseases of the spleen, and they arrest hæmorrhoidal swellings and serpiginous ulcers. They are useful also for affections of the eyelids, gradually applied in the form of a fine powder. But their chief recommendation is, their great utility in the form of a hygremplastrum or wet plaster, for cleansing wounds and fistulous sores, consuming all kinds of callosities, and making new flesh on bones that are denuded. The following are the ingredients: of pitch, six oboli, of Cimolian chalk, six drachmæ, two drachmæ of pounded copper, the same quantity of scales of iron, six drachmæ of wax, and one sextarius of oil. To these is added some cerate, when it is wanted to cleanse or fill up wounds.
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CHAP. 47. (16.)
THE ORES OF LEAD.
The nature of lead next comes to be considered. There are two kinds of it, the black and the white. The white is the most valuable: it was called by the Greeks “cassiteros,” and there is a fabulous story told of their going in quest of it to the islands of the Atlantic, and of its being brought in barks made of osiers, covered with hides. It is now known that it is a production of Lusitania and Gallæcia. It is a sand found on the surface of the earth, and of a black colour, and is only to be detected by its weight. It is mingled with small pebbles, particularly in the dried beds of rivers. The miners wash this sand, and calcine the deposit in the furnace. It is also found in the gold mines that are known as “alutiæ,” the stream of water which is passed through them detaching certain black pebbles, mottled with small white spots and of the same weight as gold. Hence it is that they remain with the gold in the baskets in which it is collected; and being separated in the furnace, are then melted, and become converted into white lead.
Black lead is not procured in Gallæcia, although it is so greatly abundant in the neighbouring province of Cantabria; nor is silver procured from white lead, although it is from black. Pieces of black lead cannot be soldered without the intervention of white lead, nor can this be done without employing oil; nor can white lead, on the other hand, be unit
ed without the aid of black lead. White lead was held in estimation in the days even of the Trojan War, a fact that is attested by Homer, who calls it “cassiteros.” There are two different sources of black lead: it being procured either from its own native ore, where it is produced without the intermixture of any other substance, or else from an ore which contains it in common with silver, the two metals being fused together. The metal which first becomes liquid in the furnace, is called “stannum;” the next that melts is silver; and the metal that remains behind is galena, the third constituent part of the mineral. On this last being again submitted to fusion black lead is produced, with a deduction of two-ninths.
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Delphi Complete Works of Pliny the Elder Page 241
