By dint of careful classification and comparison, we have been enabled to follow the march of progress through those countless centuries whose number will never be known to us, whose total would, perhaps, oppress our imaginations if we knew it; we have been enabled to discover the slow steps by which mankind raised itself from the earliest, almost shapeless, flint axe, found with the bones of the mammoth in the quaternary alluvial deposits, to the rich and varied equipment of "lacustrian civilization," as it has sometimes been called. In this unlimited field, of which one side at least must ever be lost in unfathomable obscurity, the main divisions have been traced; the stone age has been defined and divided into the palæolithic and neolithic epochs; the age of bronze followed, and then came the iron age. With the appearance of the former metal the tribes of northern and central Europe established a connection with the civilized races which surrounded the Mediterranean, and with iron we are in the full classic period.
We can never be too grateful for the persevering labours of those who have carried on these researches in every corner of Europe; their deserts are all the greater from the fact that they could never count upon those agreeable surprises which come now and then to reward excavators on the sites of ancient and historic cities. Their chances are small of finding those objects of art which, by their beauty and elegance, repay any amount of toil and expense. The remains which they bring to light have little to say to our æsthetic perceptions; they repeat a few types with an extreme monotony; but, on the other hand, they carry our thoughts back to a point far nearer the cradle of our race than the myths of early history or even the monumental remains of Egypt and Chaldæa. They cast some slight illumination upon those distant ages of which humanity has preserved no recollection. They people with unknown multitudes those remote epochs into which scientific curiosity had, but yesterday, no desire to penetrate. There can be in all this no real question of chronology, but when from the sands of Abbeville or the caverns of Perigord we dig up the first flint implements or those fragments of bone, of ivory, of reindeer horn, which have preserved to us the first attempts made by man to copy the outlines of living beings, it takes us far beyond those days of which our only knowledge comes from vague
