The other evils that are thus inflicted upon us, supervene with a bright, clear sky, and amid the silence of the night, no one being sensible of them until we have perceived their effects. These dispensations are universal and of a totally different character from those previously mentioned, and have various names given to them, sometimes mildew, sometimes blast, and sometimes coal blight; but in all cases sterility is the infallible result. It is of these last that we have now to speak, entering into details which have not hitherto been treated of by any writer; and first of all we will explain the causes of them. (29.) Independently of the moon, there are two principal causes of these calamities, which emanate more particularly from two quarters of the heavens of but limited extent. On the one hand, the Vergiliæ exercise an especial influence on our harvests, as it is with their rising that the summer begins, and with their setting, the winter; thus embracing, in the space of six months, the harvest, the vintage, and the ripening of all the vegetable productions. In addition to this, there is a circular tract in the heavens, quite visible to the human eye even, known as the Milky Way. It is the emanations from this, flowing as it were from the breast, that supply their milky[556] nutriment to all branches of the vegetable world. Two constellations more particularly mark this circular tract, the Eagle in the north, and Canicula in the south; of this last, we have already made mention[557] in its appropriate place. This circle traverses also Sagittarius and Gemini, and passing through the centre of the sun, cuts the equinoctial line below, the constellation of the Eagle making its appearance at the point of intersection on the one side, and Canicula on the other. Hence it is that the influences of both these constellations develope themselves upon all cultivated lands; it being at these points only that the centre of the sun is brought to correspond with that of the earth. If, then, at the moments of the rising and the setting of these constellations, the air, soft and pure, transmits these genial and milky emanations to the earth, the crops will thrive and ripen apace; but if, on the other hand, the moon, as already[558] mentioned, sheds her chilling dews, the bitterness thereof infuses itself into these milky secretions, and so kills the vegetation in its birth. The measure of the injury so inflicted on the earth depends, in each climate, upon the combination of the one or other of these causes; and hence it is that it is not felt in equal intensity throughout the whole earth, nor even precisely at the same moment of time. We have already[559] said that the Eagle rises in Italy on the thirteenth day[560] before the calends of January, and the ordinary course of Nature does not permit us before that period to reckon with any degree of certainty upon the fruits of the earth; for if the moon should happen to be in conjunction