commerce or barter existed in the later stone age. The reason for this opinion is that implements of stone are frequently found in localities where the stone of which they are made is not native. At Presigny le Grand, in France, there exists a great quantity of a particular kind of flint which seems to have been very convenient for the manufacture of implements; for the fields there are covered with flint-flakes and chips which have been evidently knocked off in the process of chipping out the knives, and arrow-heads, and hatchets which the stone-age men were so fond of. Now, implements made of this particular kind of flint are found in various localities, some of which are at a great distance from Presigny; and it has therefore been supposed that Presigny was a sort of manufactory for flint weapons which were bartered to neighbouring tribes, and by them again perhaps to others further off; and so these weapons gradually got dispersed. But it is also possible that the tribes of the interior, who would subsist almost exclusively by hunting, and would therefore be of a more wandering disposition than those on the sea-coast, may have paid occasional visits to this flint reservoir for the purpose of supplying themselves with weapons of a superior quality, just as the American Indians are said to go to the quarry of Coteau des Prairies on account of the particular kind of stone which is found there. In any case, whatever system of barter was carried on at that time was of a very primitive kind, and not of frequent enough occurrence to produce any important effects on the social condition of the people. That that condition had already advanced to some extent beyond its original rudeness, shows us that there existed, at all events, some capacity for improvement among the tribes which then inhabited Europe; but, when we compare them with modern tribes of savages, whose apparent condition is much the same as theirs was, and who do not seem to have made any advance for a long period, or, so far as we can judge, to be capable of making any advance by their own unassisted efforts, we cannot but conclude that the stone-age people, if left to themselves, would only have emerged out of barbarism by very slow degrees. Now we know that, about the time when bronze implements first began to be used, some very important changes also occurred in the manners and customs of the inhabitants of Europe. A custom of burning the dead superseded then the older one of burial; domestic animals of various sorts seem to have been introduced, and the bronze implements themselves show, both in the elaborateness of their workmanship and the variety of their designs, that a great change had come over European civilization. The greatness and completeness of this change, the fact that there are no traces of those intermediate steps which we should naturally expect to find in the development of the arts, denote that this change was due to some