Whenever two peoples come into contact with each other for the first time, a comparison of religions is set up; and one of the first-fruits of this earliest exercise of the comparative study of religions is that identification of gods and borrowing of cults and myths to which the term "syncretism" is applied. The part played by syncretism in the history of Italian religion is of singular importance: the Italian's misty, vaporous belief in abstract, impersonal spirits was precipitated into premature polytheism by the introduction of the anthropomorphic gods of Greece. Fortunately, the process being premature, was, and to the end remained, incomplete; and we are therefore able to employ the survivals from the older form of belief so as to form some idea of the original Italian religion. To the last, many spirits resisted the individualising process, which is the essence and condition of polytheism: the Lares and the Manes not only never became gods, but none of them was dignified by a proper name, or attained even so much individuality as Puck or Robin Goodfellow. Not can such general abstract appellations as Bona Dea, Dea Dia, be regarded as personal names, _i.e._, as the names of definite, individual, personal beings: they have not the personality of Venus or Vulcan, and yet they were the beings whom the people at large worshipped in preference to the State-gods, whose cult and myths were fashionably Hellenised. She who, under the influence of Greek religion, became the goddess Diana, was originally a tree-spirit, having no personal name, but known only by an appellation as general and abstract as that of Bona Dea. The proof that the qualities and attributes of the Greek goddess Artemis were attached by syncretism to the Italian tree-spirit is brought to light by two of Plutarch's penetrating questions (_R. Q._ 3 and 4), why harts' horns are set up in all the temples of Diana save that on Mount Aventine, in which are ox-horns? and why men are excluded from one particular temple of the same goddess? These differences in cult obviously point to the worship of different goddesses under the same name; and, as a matter of fact, we know first that harts were sacred to the Greek goddess, Artemis, whereas the genuine Italian Diana was the goddess of oxen; next, we know that the identification of Artemis and Diana was effected by Servius Tullius.[61] To understand the exclusion of men from the temple in the Patrician Street, however, we must inquire into the nature of the Italian Diana. With this object, we may either assume that the pro-ethnic Aryans were polytheists, and that therefore the primitive Italians also worshipped Nature-gods; in which case, starting from the etymology of the word Diana (from the root _div_, "shine"), we must either at once make Diana a moon-goddess,[62] and thus account for the fact that she was a goddess of child-birth, and therefore men were excluded from her temple. But this seems improbable even