10. The same writer mentions a tree at Gades, which had boughs reaching to the ground; its sword-shaped leaves often measuring a cubit long, and four fingers broad. Also that about Carthagena there was a tree whose thorns produced a bark from which most beautiful stuffs were woven. As for the tree [he saw] at Gades, we ourselves have observed a similar in Egypt, so far as the inclination of the boughs is concerned, but with a differently shaped leaf, and producing no fruit, which according to him the other did. In Cappadocia there are stuffs made from thorns, but it is not a tree which produces the thorn from which the bark is taken, but a low plant; he also tells us of a tree at Gades, from which if a branch be broken off a milk will flow, and if the root be cut a red fluid runs. Thus much for Gades. 11. The Cassiterides are ten in number, and lie near each other in the ocean towards the north from the haven of the Artabri. One of them is desert, but the others are inhabited by men in black cloaks, clad in tunics reaching to the feet, girt about the breast, and walking with staves, thus resembling the Furies we see in tragic representations.[1301] They subsist by their cattle, leading for the most part a wandering life. Of the metals they have tin and lead; which with skins they barter with the merchants for earthenware, salt, and brazen vessels. Formerly the Phœnicians alone carried on this traffic from Gades, concealing the passage from every one; and when the Romans followed a certain ship-master, that they also might find the market, the ship-master of jealousy purposely ran his vessel upon a shoal, leading on those who followed him into the same destructive disaster; he himself escaped by means of a fragment of the ship, and received from the state the value of the cargo he had lost. The Romans nevertheless by frequent efforts discovered the passage, and as soon as Publius Crassus, passing over to them, perceived that the metals were dug out at a little depth, and that the men were peaceably disposed, he declared it to those who already wished to traffic in this sea for profit, although the passage was longer than that to Britain.[1302] Thus far concerning Iberia and the adjacent islands. BOOK IV. GAUL. SUMMARY. The Fourth Book contains a description of the regions about Gaul, Spain, and the Alps on this side, towards Italy. Likewise of Britain, and of certain islands in the ocean which are habitable, together with the country of the barbarians, and the nations dwelling beyond the Danube. CHAPTER I.