The phenomena of the transformation of deities into demons meet the student of Demonology at every step. We shall have to consider many examples of a kind similar to those which have been mentioned in the preceding chapter; but it is necessary to present at this stage of our inquiry a sufficient number of examples to establish the fact that in every country forces have been at work to degrade the primitive gods into types of evil, as preliminary to a consideration of the nature of those forces. We find the history of the phenomena suggested in the German word for idol, Abgott--ex-god. Then we have 'pagan,' villager, and 'heathen,' of the heath, denoting those who stood by their old gods after others had transferred their faith to the new. These words bring us to consider the influence upon religious conceptions of the struggles which have occurred between races and nations, and consequently between their religions. It must be borne in mind that by the time any tribes had gathered to the consistency of a nation, one of the strongest forces of its coherence would be its priesthood. So soon as it became a general belief that there were in the universe good and evil Powers, there must arise a popular demand for the means of obtaining their favour; and this demand has never failed to obtain a supply of priesthoods claiming to bind or influence the præternatural beings. These priesthoods represent the strongest motives and fears of a people, and they were gradually intrenched in great institutions involving powerful interests. Every invasion or collision or mingling of races thus brought their respective religions into contact and rivalry; and as no priesthood has been known to consent peaceably to its own downfall and the degradation of its own deities, we need not wonder that there have been perpetual wars for religious ascendency. It is not unusual to hear sects among ourselves accusing each other of idolatry. In earlier times the rule was for each religion to denounce its opponent's gods as devils. Gregory the Great wrote to his missionary in Britain, the Abbot Mellitus, second Bishop of Canterbury, that 'whereas the people were accustomed to sacrifice many oxen in honour of demons, let them celebrate a religious and solemn festival, and not slay the animals to the devil (diabolo), but to be eaten by themselves to the glory of God.' Thus the devotion of meats to those deities of our ancestors which the Pope pronounces demons, which took place chiefly at Yule-tide, has survived in our more comfortable Christmas banquets. This was the fate of all the deities which Christianity undertook to suppress. But it had been the habit of religions for many ages before. They never denied the actual existence of the deities they were engaged in suppressing. That would have been too great an outrage upon popular beliefs, and might have caused a reaction; and, besides, each new religion had an interest