The second revolution which we can clearly discern, and far the most important as a factor in Roman history, is that of the organisation of the religion of the city-state of Rome. Doubtless there were stages intermediate between the two, but they are entirely lost to us. We had to concentrate our attention on the city of the four regions--the first city we really know--and to examine the one document which has survived from it, the so-called calendar of Numa. In my fifth lecture I explained the nature of that calendar, and noted how it reflects the life of a people at once agricultural and military, and how it must presuppose the existence of a highly organised legal priesthood, or of some powerful genius for political as well as religious legislation. The tradition of a great priest-king is not wholly to be despised, for it expresses the feeling of the Romans that religious law and order were indispensable parts of their whole political and social life. During the rest of these lectures I have been trying to interrogate this religious calendar, with such help as could be gained from any other sources, on two points: (1) the conception, or, if we can venture to use the word, the knowledge, which the Romans of that early city-state had of the Divine; (2) the chief forms and methods of their worship. We saw that they did not think of the divine beings as existing in human form with human weaknesses, but as invisible and intangible functional powers, _numina_. Each had its special limited sphere of action; and some were now localised within the _pomoerium_, or just outside it within the _ager Romanus_, and worshipped under a particular name. I suggested that this very settlement had probably some influence in preparing them for assuming a more definite and personal character, should the chance be given them. In regard to the forms of cult with which they were propitiated, I found in the ritual of sacrifice and prayer a genuine advance towards a really religious attitude to the deity, the sacrifices being meant to increase his power to benefit the community, and the prayers to diminish such inclination as he might have to damage it; but that there are in these certain survivals of the age of magic, which are, however, only formal, and have lost their original significance. I found some curious examples of such survivals in the rite of _devotio_, and in vows generally a somewhat lower type of method in dealing with the supernatural. But, on the other hand, the forms of _lustratio_, at the bottom of which seems to lie the idea of getting rid of evil spirits and influences, present very beautiful examples of what we may really call religious ceremony.