The time that intervenes between these periods is one that is of primary importance in the cultivation of the vine; as the constellation of which we have spoken, under the name of Canicula, has now to decide upon the fate of the grape. It is at this period that the grapes are said to be charred,[549] a blight falling upon them which burns them away, as though red-hot coals had been applied to them. There is no hail that can be compared with this destructive malady, nor yet any of those tempests, which have been productive of such scarcity and dearth. For the evil effects of these, at the very utmost, are only felt in isolated districts, while the coal blight,[550] on the other hand, extends over whole countries, far and wide. Still, however, the remedy would not be very difficult, were it not that men would much rather calumniate Nature, than help themselves. It is said that Democritus,[551] who was the first to comprehend and demonstrate that close affinity which exists between the heavens and the earth, finding his laborious researches upon that subject slighted by the more opulent of his fellow-citizens, and presaging the high price of oil, which was about to result upon the rising of the Vergiliæ, (as we have already mentioned,[552] and shall have to explain more fully hereafter), bought up all the oil in the country, which was then at a very low figure, from the universal expectation of a fine crop of olives; a proceeding which greatly surprised all who knew that a life of poverty and learned repose was so entirely the object of his aspirations. When, however, his motives had been fully justified by the result, and vast riches had flowed in upon him apace, he returned all his profits to the disappointed proprietors, whose avarice had now taught them to repent, thinking it quite sufficient to have thus proved how easy it was for him to acquire riches whenever he pleased. At a more recent period, again, Sextius,[553] a Roman philosopher residing at Athens, made a similar application of his knowledge. Such, then, is the utility of science, the instruction provided by which it shall be my aim, as clearly and as perspicuously as possible, to apply to the various occupations of a country life.