The Tuscan books inform us, that there are nine Gods who discharge thunder-storms, that there are eleven different kinds of them, and that three of them are darted out by Jupiter. Of these the Romans retained only two, ascribing the diurnal kind to Jupiter, and the nocturnal to Summanus[2]; this latter kind being more rare, in consequence of the heavens being colder, as was mentioned above. The Etrurians also suppose, that those which are named Infernal burst out of the ground; they are produced in the winter and are particularly fierce and direful, as all things are which proceed from the earth, and are not generated by or proceeding from the stars, but from a cause which is near at hand, and of a more disorderly nature. As a proof of this it is said, that all those which proceed from the higher regions strike obliquely, while those which are termed terrestrial strike in a direct line. And because these fall from matter which is nearer to us, they are supposed to proceed from the earth, since they leave no traces of a rebound; this being the effect of a stroke coming not from below, but from an opposite quarter. Those who have searched into the subject more minutely suppose, that these come from the planet Saturn, as those that are of a burning nature do from Mars. In this way it was that Volsinium, the most opulent town of the Tuscans, was entirely consumed by lightning[3]. The first of these strokes that a man receives, after he has come into possession of any property, is termed Familiar[4], and is supposed to prognosticate the events of the whole of his life. But it is not generally supposed that they predict events of a private nature for a longer space than ten years, unless they happen at the time of a first marriage or a birth-day; nor that public predictions extend beyond thirty years[5], unless with respect to the founding of colonies[6].