Just as in the valley of the Po the Romans made the production of wool and the culture of corn supersede the Celtic feeding of pigs on acorns, so the rearing of sheep and the agriculture in the plains of the Scheldt and the Maas are traceable to their influence. In Britain even the threshing of corn was not yet usual; and in its more northern districts agriculture was not practised, and the rearing of cattle was the only known mode of turning the soil to account. The culture of the olive and vine, which yielded rich produce to the Massiliots, was not yet prosecuted beyond the Cevennes in the time of Caesar.

The Gauls were from the first disposed to settle in groups; there were open villages everywhere, and the Helvetic canton alone numbered in 696 four hundred of these, besides a multitude of single homesteads. But there were not wanting also walled towns, whose walls of alternate layers surprised the Romans both by their suitableness and by the elegant interweaving of timber and stones in their construction; while, it is true, even in the towns of the Allobroges the buildings were erected solely of wood. Of such towns the Helvetii had twelve and the Suessiones an equal number; whereas at all events in the more northern districts, such as among the Nervii, while there were doubtless also towns, the population during war sought protection in the morasses and forests rather than behind their walls, and beyond the Thames the primitive defence of the wooden barricade altogether took the place of towns and was in war the only place of refuge for men and herds.

In close association with the comparatively considerable development of urban life stands the activity of intercourse by land and by water. Everywhere there were roads and bridges. The river-navigation, which streams like the Rhone, Garonne, Loire, and Seine, of themselves invited, was considerable and lucrative.

But far more remarkable was the maritime navigation of the Celts. Not only were the Celts, to all appearance, the nation that first regularly navigated the Atlantic ocean, but we find that the art of building and of managing vessels had attained among them a remarkable development. The navigation of the peoples of the Mediterranean had, as may readily be conceived from the nature of the waters traversed by them, for a comparatively long period adhered to the oar; the war-vessels of the Phoenicians, Hellenes, and Romans were at all times oared galleys, in which the sail was applied only as an occasional aid to the oar; the trading vessels alone were in the epoch of developed ancient civilization "sailer" properly so called[14]. On the other hand the Gauls doubtless employed in the Channel in Caesar's time, as for long afterwards, a species of portable leathern skiffs, which seem to have been in the main common oared boats, but on the west coast of Gaul the Santones, the Pictones, and above all the Veneti sailed in large though clumsily built ships, which were not impelled by oars but were provided with leathern sails and iron anchor-chains; and they employed these not only for their traffic with Britain, but also in naval combat. Here therefore we not only meet for the first time with navigation in the open ocean, but we find that here the sailing vessel first fully took the place of the oared boat - an improvement, it is true, which the declining activity of the old world did not know how to turn to account, and the immeasurable results of which our own epoch of renewed culture is employed in gradually reaping.

With this regular maritime intercourse between the British and Gallic coasts, the very close political connection between the inhabitants on both sides of the Channel is as easily explained as the flourishing of transmarine commerce and of fisheries. It was the Celts of Brittany in particular, that brought the tin of the mines of Cornwall from England and carried it by the river and land routes of Gaul to Narbo and Massilia. The statement, that in Caesar's time certain tribes at the mouth of the Rhine subsisted on fish and birds' eggs, may probably refer to the circumstance that marine fishing and the collection of the eggs of sea-birds were prosecuted there on an extensive scale. When we put together and endeavour to fill up the isolated and scanty statements which have reached us regarding the Celtic commerce and intercourse, we come to see why the tolls of the river and maritime ports play a great part in the budgets of certain cantons, such as those of the Haedui and the Veneti, and why the chief god of the nation was regarded by them as the protector of the roads and of commerce, and at the same time as the inventor of manufactures. Accordingly the Celtic industry cannot have been wholly undeveloped; indeed the singular dexterity of the Celts, and their peculiar skill in imitating any model and executing any instructions, are noticed by Caesar.

In most branches, however, their handicraft does not appear to have risen above the ordinary level; the manufacture of linen and woollen stuffs, that subsequently flourished in central and northern Gaul, was demonstrably called into existence only by the Romans. The elaboration of metals forms an exception, and so far as we know the only one. The copper implements not unfrequently of excellent workmanship and even now malleable, which are brought to light in the tombs of Gaul, and the carefully adjusted Arvernian gold coins, are still at the present day striking witnesses of the skill of the Celtic workers in copper and gold; and with this the reports of the ancients well accord, that the Romans learned the art of tinning from the Bituriges and that of silvering from the Alesini - inventions, the first of which was naturally suggested by the traffic' in tin, and both of which were probably made in the period of Celtic freedom.

Hand in hand with dexterity in the elaboration of the metals went the art of procuring them, which had attained, more especially in the iron mines on the Loire, such a degree of professional skill that the miners played an important part in the sieges. The opinion prevalent among the Romans of this period, that Gaul was one of the richest gold countries in the world, is no doubt refuted by the well-known nature of the soil and by the character of the articles found in the Celtic tombs, in which gold appears but sparingly and with far less frequency than in the similar repositories of the true native regions of gold; this conception no doubt had its origin merely from the descriptions which Greek travellers and Roman soldiers, doubtless not without strong exaggeration, gave to their countrymen of the magnificence of the Arvernian kings[15], and of the treasures of the Tolosan temples[16]. But their stories were not pure fictions. It may well be believed that in and near the rivers which flow from the Alps and the Pyrenees gold-washing and searches for gold, which are unprofitable at the present value of labour, were worked with profit and on a considerable scale in ruder times and with a system of slavery; besides, the commercial relations of Gaul may, as is not unfrequently the case with half-civilized peoples, have favoured the accumulation of a dead stock of the precious metals.