There was a time, not so very long ago, when under the banner of the new-born science of "Comparative Philology" there gathered together a group of men who thought they held the key to prehistoric history, and that words themselves would tell the story where ancient monuments and literature were silent. It was a great and beautiful thought, and the science which encouraged it has taken its place as a useful and reputable member of the community of sciences, but its pretensions to the throne of the revealer of mysteries have been withdrawn by those who are its most ardent followers, and the "Indo-Germanic religion" which is brought into being is a pleasant thought for an idle hour rather than a foundation and starting-point for the study of ancient religion in general. Altogether aside from the fact that although primitive religion and nationality are in the main identical, language and nationality are by no means so--we have the great practical difficulty in the case of Greece and Rome that in the earliest period of which we have knowledge these two religions bear so little resemblance that we must either assert for the time of Indo-Germanic unity a religious development much more primitive than that which comparative philology has sketched, or we must suppose the presence of a strong decadent influence in Rome's case after the separation, which is equally difficult. If we realise that in a primitive religion the name of the god is usually the same as the name of the thing which he represents, the existence of a Greek god and a Roman god with names which correspond to the same Indo-Germanic word proves linguistically that the _thing_ existed and had a name before the separation, but not at all that the thing was deified or that the name was the name of a god at that time. We must therefore be content to begin our study of religion much more humbly and at a much later period.