In the copper forges also smegma[1654] 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.
CHAP. 37.—DIPHRYX.
There is another product of these furnaces, which is easily distinguished from smegma, and which the Greeks call “diphryx,”[1655] 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;[1656] 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.
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,[1657] which devours them both. The origin and nature of this coin is to me incomprehensible;[1658] but I will quote the very words of the story, as given by old Messala[1659] 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.”
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,[1660] 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.[1661] Let us therefore acquit Nature of a charge that here belongs to man himself.[1662]
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.[1663] 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.