He has little conception of nature’s power who thinks that she may not do exceptionally what she does not do repeatedly. She does not often display comets; she has assigned them a different place, different periods from the other stars, and motions unlike theirs. She wished to enhance the greatness of her work by these strange visitants whose form is too beautiful to be thought accidental, whether you consider their vastness or their brightness that surpasses in size and brilliance all other stars. Their appearance has, in truth, an exceptional distinction; they are not cribbed and cabined within narrow bonds, but let loose to roam freely, to range over the region of many stars. XXVIII According to Aristotle, comets give indications of storm and disturb- 1 ances that bring wind and rain. Well, then, are you of opinion it is not a star because it foretells what is coming? True the comet is not a sign of storm in the same way as it is a sign of coming rain when The oil splutters, and rotten fungus covers the wick; or in the same way as it is a forecast of a raging sea--if the sea Coots[99] sport on land; her haunts in the marshes Are deserted by the heron, and she soars above the heights of cloud: [99] Perhaps cormorants: the identity of the bird is difficult to determine. but in the same way as the equinox is a sign of the turn of the year 2 toward cold or heat, or as the predictions of the Chaldaean soothsayers who tell what sorrow or joy is determined at birth by the natal star, are indications of coming events. To convince you of the truth of this, I must warn you that the rising of a comet does not convey a threat of wind and rain in the immediate future, as Aristotle says, but casts suspicion over the whole year. Hence it is plain that the comet has not derived prognostications from its immediate surroundings to reveal for the immediate future, but that it has them stored up and buried deep within by the laws of the universe. The comet which appeared in the consulship of Paterculus and Vopiscus fulfilled the anticipations of this kind entertained by Aristotle, and for that matter by Theophrastus; for there were everywhere severe and prolonged storms, 3 while in Achaia and Macedonia cities were overturned by earthquakes. The slowness of the comets’ motion, Aristotle says, is a proof that they are rather heavy, containing much earthy matter. So are their orbits too, for they are usually confined to the neighbourhood of the poles. XXIX