The persons who do this take no notice, consequently, of the phenomena of Nature, while others, again, lay too much stress upon them, and hence, by these refined subtleties and distinctions, only add to their blindness; for here are ignorant rustics, not only dealing with a branch of learning, but that branch astronomy! It must still, however, be admitted that the observation of the heavens plays a very important part in the operations of agriculture; and Virgil,[409] we find, gives it as his advice, that before any thing else, we should learn the theory of the winds, and the revolutions of the stars; for, as he says, the agriculturist, no less than the mariner, should regulate his movements thereby. It is an arduous attempt, and almost beyond all hope of success, to make an endeavour to introduce the divine science of the heavens to the uninformed mind of the rustic; still, however, with a view to such vast practical results as must be derived from this kind of knowledge, I shall make the attempt. There are some astronomical difficulties, however, which have been experienced by the learned even, that ought to be first submitted for consideration, in order that the mind may feel some encouragement on abandoning the study of the heavens, and may be acquainted with facts at least, even though it is still unable to see into futurity. CHAP. 57. (25.)—ARRANGEMENT OF THE STARS ACCORDING TO THE TERRESTRIAL DAYS AND NIGHTS. In the first place, it is almost an utter impossibility to calculate with a fair degree of accuracy the days of the year and the movements of the sun. To the three hundred and sixty-five days there are still to be added the intercalary days, the result of the additional quarters of a day and night: hence it is, that it is found impossible to ascertain with exactness the proper periods for the appearance of the stars. To this we must add, too, a certain degree of uncertainty connected with these matters, that is universally admitted; thus, for instance, bad and wintry weather will often precede, by several days, the proper period for the advent of that season, a state of things known to the Greeks as προχειμάζειν;[410] while at another time, it will last longer than usual, a state of circumstances known as ἐπιχειμάζειν.[411] The effects, too, of the changes that take place in the seasons will sometimes be felt later, and at other times earlier, upon their reaching the face of the earth; and we not unfrequently hear the remark made, upon the return of fine weather, that the action of such and such a constellation is now completed.[412] And then, again, as all these phænomena depend upon certain stars, arranged and regulated in the vault of heaven, we find intervening, in accordance with the movements; of certain stars, hailstorms and showers, themselves productive of no slight results, as we have already observed,[413] and apt to interfere with the anticipated regular recurrence of the seasons. Nor are we to