On the whole, Spain was in a military as well as financial point of view a burden rather than a gain to the Roman commonwealth; and the question naturally occurs, Why did the Roman government, whose policy at that time evidently did not contemplate the acquisition of countries beyond the sea, not rid itself of these troublesome possessions?
The not inconsiderable commercial connections of Spain, her important iron- mines, and her still more important silver-mines famous from ancient times even in the far east( 5)--which Rome, like Carthage, took into her own hands, and the management of which was specially regulated by Marcus Cato (559)--must beyond doubt have co-operated to induce its retention; but the chief reason of the Romans for retaining the peninsula in their own immediate possession was, that there were no states in that quarter of similar character to the Massiliot republic in the land of the Celts and the Numidian kingdom in Libya, and that thus they could not abandon Spain without putting it into the power of any adventurer to revive the Spanish empire of the Barcides.
Notes for Chapter VII 1.

According to the account of Strabo these Italian Boii were driven by the Romans over the Alps, and from them proceeded that Boian settlement in what is now Hungary about Stein am Anger and Oedenburg, which was attacked and annihilated in the time of Augustus by the Getae who crossed the Danube, but which bequeathed to this district the name of the Boian desert.

This account is far from agreeing with the well-attested representation of the Roman annals, according to which the Romans were content with the cession of half the territory; and, in order to explain the disappearance of the Italian Boii, we have really no need to assume a violent expulsion--the other Celtic peoples, although visited to a far less extent by war and colonization, disappeared not much less rapidly and totally from the ranks of the Italian nations.

On the other hand, other accounts suggest the derivation of those Boii on the Neusiedler See from the main stock of the nation, which formerly had its seat in Bavaria and Bohemia before Germanic tribes pushed it towards the south.

But it is altogether very doubtful whether the Boii, whom we find near Bordeaux, on the Po, and in Bohemia, were really scattered branches of one stock, or whether this is not an instance of mere similarity of name.
The hypothesis of Strabo may have rested on nothing else than an inference from the similarity of name--an inference such as the ancients drew, often without due reason, in the case of the Cimbri, Veneti, and others.
2.III.