Pliny has already told us that the Gauls manufactured many linen sails; we know also that they made not only rough sails, but also fine linen for clothing, which had a wide market. There have been found in the Orient numerous fragments of an inscription containing the famous edict of Diocletian on maximum sale prices allowed, an inscription of value to us for its nomenclature of ancient fabrics. In this nomenclature is mentioned the _birrus_ of Laodicea, an imitation of the _birrus_ of the Nervii, which was a very fine linen cloth, worn by ladies of fashion. Laodicea was one of the most ancient centres of Oriental textile fabrics; the Nervii were one of the most remote of the Gallic peoples, living--the coincidence is noteworthy--about where Flanders is now. If at Laodicea they made at the end of the third century an imitation of Nervian linen, that means that the Nervii had succeeded in manufacturing and finding market for cloth so desirable as to rouse the Laodiceans, competing for trade, to imitate it. What proof more persuasive that during the early centuries of the Empire the Gauls greatly improved their industries and widened their markets? They had mastered weaving, but they did not stop there; they invented new methods of dyeing, using vegetable dyes instead of the customary animal colours of the Orient. Pliny says: The Gaul imitates with herbs all colours, including Tyrian purple; they do not seek the mollusk on the sea bottom; they run no risk of being devoured by sea monsters; they do not exploit the anchorless deep to multiply the attractions of the courtesan, or to increase the powers of the seducer of another's wife. They gather the herbs like cereals, standing on the dry ground; although the colour that they derive does not bear washing. Luxury could thus be gratified with greater show at the cost of fewer dangers. It is clear, then, according to Pliny, at one time, it was believed that the competition of Gallic dyers might have ruined the Oriental, and would have done so, had the tenacity of their vegetable colouring equalled its beauty. In another passage Pliny tells us that these Gallic stuffs were used especially by the slaves and the populace. The wool industry made no less progress in Gaul than weaving and dyeing. From numerous passages in Juvenal and Martial it appears that the woollen clothing worn by the populace of Rome in the second century was woven in Gaul, particularly in the districts to-day known as Arras, Langres, Saintonge. Pliny attributes to the Gauls the invention of a wool, that, soaked in acid, became incombustible, and was used to make mattresses.