It is evident that this story is founded on the sixth chapter of Genesis: "There were giants in the earth in those days, and also after that, when the sons of God came in unto the daughters of men, and they bear children to them, the same became mighty men which were of old, men of renown." Genesis and the Book of Enoch perfectly agree respecting the coupling of the angels with the daughters of men, and the race of giants which sprung from this union; but neither this Enoch, nor any book of the Old Testament, speaks of the war of the angels against God, or of their defeat, or of their fall into hell, or of their hatred to mankind. Nearly all the commentators on the Old Testament unanimously say that before the Babylonian captivity, the Jews knew not the name of any angel. The one that appeared to Manoah, father of Samson, would not tell his name. When the three angels appeared to Abraham, and he had a whole calf dressed to regale them, they did not tell him their names. One of them said: "I will come to see thee next year, if God grant me life; and Sarah thy wife shall have a son." Calmet discovers a great affinity between this story and the fable which Ovid relates in his _"Fasti"_, of Jupiter, Neptune, and Mercury, who, having supped with old Hyreus, and finding that he was afflicted with impotence, urinated upon the skin of a calf which he had served up to them, and ordered him to bury this hide watered with celestial urine in the ground, and leave it there for nine months. At the end of the nine months, Hyreus uncovered his hide, and found in it a child, which was named Orion, and is now in the heavens. Calmet moreover says that the words which the angels used to Abraham may be rendered thus: A child shall be born of your calf. Be this as it may, the angels did not tell Abraham their names; they did not even tell them to Moses; and we find the name of Raphael only in Tobit, at the time of the captivity. The other names of angels are evidently taken from the Chaldæans and the Persians. _Raphael_, _Gabriel_, and _Uriel_, are Persian or Babylonian. The name of _Israel_ itself is Chaldæan, as the learned Jew Philo expressly says, in the account of his deputation to Caligula. We shall not here repeat what has been elsewhere said of angels. _Whether the Greeks and the Romans admitted the Existence of Angels._ They had gods and demi-gods enough to dispense with all other subaltern beings. Mercury executed the commissions of Jupiter, and Iris those of Juno; nevertheless, they admitted genii and demons. The doctrine of guardian angels was versified by Hesiod, who was contemporary with Homer. In his poem of "The Works and Days" he thus explains it: