We must also observe the mobility and interchangeableness of these fetishes, myths, and imaginary entities in the primitive times of the human race, and even in later ages; at one time the fetish acts as a myth, at another the myth has a logical existence. Of this there are many proofs in the traditions of ancient peoples, in the intellectual life of modern savages, and in that of the civilized nations to which we ourselves belong. The historic development does not always follow the regular course we have just described, although these are, in a strictly logical sense, the necessary stages of intellectual evolution. Historically they are often jostled and confounded together by the lively susceptibility and alacrity of the imagination of primitive man, and it is precisely this characteristic which makes these marvellous ages so fertile in fanciful creations, and also in scientific intuitions.
Any one who is sufficiently acquainted with the ancient literature of civilized peoples, and with the legends of those which are rude and savage; any one who has reflected on the spontaneous value of words and conceptions in modern speech, must often have observed how myth assumed the form of a logical conception as time went on; and conversely how the logical entity assumed the form of a myth, and how interchangeable they are. It is well known that the myths have been so far adapted to the necessities of speech as to be transmuted into verbs; _libare_ from _liber_, which perhaps came in its turn from _liba_, a propitiatory cake, while _Libra_ was the genius who in mythological ages presided over fruitfulness and plenty. So again _juvare_, from the root _jov_, after it had already been used for the anthropomorphic _Jove_. We find in Plautus the verb _summanare_, from the god _Summanus_, the nocturnal sky. Not only verbs but adjectives were derived in common speech from the mythical names of gods; from _Genius_, a multiform and universal power in ancient Latin mythology, we have _genialis_ and hence the expressions _genialis lectus_, _genialis homo_, _genialis hiems_, and poets and philosophers apply the same epithet even to the elements and the stars. On the other hand, Virtue, Faith, Piety, and other like moral conceptions, first regarded as real, yet impersonal entities, were transformed into a perfect myth, and into human forms worthy of divine worship.