The characteristic traits of the moon which made the deepest impression on our ancestors were its increase, and afterwards its gradual diminution, until its total disappearance. The eclipses, though filling the minds of the people with sudden fear at first, did not continue long to awaken dread or curiosity, as they were of rare occurrence and transitory; the moon, it was thought, was swallowed and afterwards disgorged by some hostile power; but the monthly increase and diminution required some other explanation. The Hindoos, in seeking to discover the abode of the gods and of their own ancestors, assigned the brilliant sky to the former, and where, therefore, should the Fathers live if not in the vast vault and in the moon? This was, in fact, the belief of the whole Aryan race. But the subject is complicated, since in an earlier period of lunar mythology, we find in the Vedic Pantheon a divinity of the name of Soma, which certain poets identify with the plant of that name, whose intoxicating juice played an important part in the sacrifices; there is no doubt a great obscurity with regard to these two rival powers, to which the same name had been given, and on which mythologists have found it difficult to enlighten us; but quite recently exponents of the Rig-Veda have discovered that Soma originally meant the moon itself, thus the Rishis allow it to be apparent in their hymns that there were at one time two Somas--the plant and its juice, and at an earlier period the other Soma, known only to the old Brahmans, which was the moon. A belief held by the Hindoos was that the moon supplied nourishment to the gods, which was the cause of the diminution; its increase was explained by the entrance into it of the souls of their ancestors; the gods swallowing these also as an integral portion of the moon. All these ideas were of slow development, and of successive growth; no portion of mythology had a systematic elaboration. I will add as a curious scientific fact, that lately botanists have sought in vain in Northern India and in Persia for a plant whose qualities correspond to those of the Soma as described in the Vedic hymns; they are more or less agreed that it must be akin to the _Ephedra_, but as this plant abounded in the whole country between Siberia and the Iberian Peninsula, there was no hope of discovering the locality of the Aryans by means of the habitat of the plant.