The more the scanty remnants of Celtic religion are examined, the clearer it becomes that many of its characteristic features had been evolved during the vast period of the ages of stone. During these millennia, men had evolved, concomitantly with their material civilisation, a kind of working philosophy of life, traces of which are found in every land where this form of civilisation has prevailed. Man's religion can never be dissociated from his social experience, and the painful stages through which man reached the agricultural life, for example, have left their indelible impress on the mind of man in Western Europe, as they have in every land. We are thus compelled, from the indications which we have of Celtic religion, in the names of its deities, its rites, and its survivals in folk-lore and legend, to come to the conclusion, that its fundamental groundwork is a body of ideas, similar to those of other lands, which were the natural correlatives of the phases of experience through which man passed in his emergence into civilised life. To demonstrate and to illustrate these relations will be the aim of the following chapters. CHAPTER II--THE CHIEF PHASES OF CELTIC CIVILISATION In the chief countries of Celtic civilisation, Gaul, Cisalpine and Transalpine, Britain and Ireland, abundant materials have been found for elucidating the stages of culture through which man passed in prehistoric times. In Britain, for example, palaeolithic man has left numerous specimens of his implements, but the forms even of these rude implements suggest that they, too, have been evolved from still more primitive types. Some antiquarians have thought to detect such earlier types in the stones that have been named 'eoliths' found in Kent, but, though these 'eoliths' may possibly show human use, the question of their history is far from being settled. It is certain, however, that man succeeded in maintaining himself for ages in the company of the mammoth, the cave-bear, and other animals now extinct. Whether palaeolithic man survived the Ice Age in Britain has not so far been satisfactorily decided. In Gaul, however, there is fair evidence of continuity between the Palaeolithic and Neolithic periods, and this continuity must obviously have existed somewhere. Still in spite of the indications of continuity, the civilisation of primitive man in Gaul presents one aspect that is without any analogues in the life of the palaeolithic men of the River Drift period, or in that of man of the New Stone Age. The feature in question is the remarkable artistic skill shown by the cave men of the Dordogne district. Some of the drawings and carvings of these men reveal a sense of form which would have done credit to men of a far later age. A feature such as this, whatever may have been its object, whether it arose from an effort by means of 'sympathetic magic' to catch animals, as M. Salomon Reinach suggests, or to the mere artistic impulse, is a standing