All vegetable productions are cut, gathered, and housed to more advantage while the moon is on the wane than while it is on the increase. Manure must never be touched except when the moon is on the wane; and land must be manured more particularly while the moon is in conjunction, or else at the first quarter. Take care to geld your boars, bulls, rams, and kids, while the moon is on the wane. Put eggs under the hen at a new moon. Make your ditches in the night-time, when the moon is at full. Cover up the roots of trees, while the moon is at full. Where the soil is humid, put in seed at the moon’s conjunction, and during the four days about that period. It is generally recommended, too, to give an airing to corn and the leguminous grains, and to garner them, towards the end of the moon; to make seed-plots when the moon is above the horizon; and to tread out the grape, to fell timber, and to do many other things that have been mentioned in their respective places, when the moon is below it.
The observation of the moon, in general, as already observed in the Second Book,[656] is not so very easy, but what I am about here to state even rustics will be able to comprehend: so long as the moon is seen in the west, and during the earlier hours of the night, she will be on the increase, and one half of her disk will be perceived; but when the moon is seen to rise at sunset and opposite to the sun, so that they are both perceptible at the same moment, she will be at full. Again, as often as the moon rises in the east, and does not give her light in the earlier hours of the night, but shows herself during a portion of the day, she will be on the wane, and one half of her only will again be perceptible: when the moon has ceased to be visible, she is in conjunction, a period known to us as “interlunium.”[657] During the conjunction, the moon will be above the horizon the same time as the sun, for the whole of the first day; on the second, she will advance upon the night ten-twelfths of an hour and one-fourth of a twelfth;[658] on the third day, the same as on the second, and * * * so on in succession up to the fifteenth day, the same proportional parts of an hour being added each day. On the fifteenth day she will be above the horizon all night, and below it all day. On the sixteenth, she will remain below the horizon ten-twelfths of an hour, and one-fourth of a twelfth, at the first hour of the night, and so on in the same proportion day after day, up to the period of her conjunction; and thus, the same time which, by remaining under the horizon, she withdraws from the first part of the night, she will add to the end of the night by remaining above the horizon. Her revolutions, too, will occupy thirty days one month, and twenty-nine the next, and so on alternately. Such is the theory of the revolutions of the moon.
CHAP. 76. (33.)—THE THEORY OF THE WINDS.
The theory of the winds[659] is of a somewhat more intricate nature. After observing the quarter in which the sun rises on any given day, at the sixth[660] hour of the day take your position in such a manner as to have the point of the sun’s rising on your left; you will then have the south directly facing you, and the north at your back: a line drawn through a field in this direction[661] is called the “cardinal”[662] line. The observer must then turn round, so as to look upon his shadow, for it will be behind him. Having thus changed his position, so as to bring the point of the sun’s rising on that day to the right, and that of his setting to the left, it will be the sixth hour of the day, at the moment when the shadow straight before him is the shortest. Through the middle of this shadow, taken lengthwise, a furrow must be traced in the ground with a hoe, or else a line drawn with ashes, some twenty feet in length, say; in the middle of this line, or, in other words, at the tenth foot in it, a small circle must then be described: to this circle we may give the name of the “umbilicus,” or “navel.” That point in the line which lies on the side of the head of the shadow will be the point from which the north wind blows. You who are engaged in pruning trees, be it your care that the incisions made in the wood do not face this point; nor should the vine-trees[663] or the vines have this aspect, except in the climates of Africa,[664] Cyrenæ, or Egypt. When the wind blows, too, from this point, you must never plough, nor, in fact, attempt any other of the operations of which we shall have to make mention.[665]
That part of the line which lies between the umbilicus and the feet of the shadow will look towards the south, and indicate the point from which the south wind[666] blows, to which, as already mentioned,[667] the Greeks have given the name of Notus. When the wind comes from this quarter, you, husbandman, must never fell wood or touch the vine. In Italy this wind is either humid or else of a burning heat, and in Africa it is accompanied with intense heat[668] and fine clear weather. In Italy the bearing branches should be trained to face this quarter, but the incisions made in the trees or vines when pruned must never face it. Let those be on their guard against this wind upon the four[669] days at the rising of the Vergiliæ, who are engaged in planting the olive, as well as those who are employed in the operations of grafting or inoculating.
It will be as well, too, here to give some advice, in reference to the climate of Italy, as to certain precautions to be observed at certain hours of the day. You, woodman, must never lop the branches in the middle of the day; and you, shepherd, when you see midday approaching in summer, and the shadow gradually decreasing, drive your flocks from out of the sun into some well-shaded spot. When you lead the flocks to pasture in summer, let them face the west before midday,[670] and after that time, the east: if this precaution is not adopted, calamitous results will ensue; the same, too, if the flocks are led in winter or spring to pastures covered with dew. Nor must you let them feed with their faces to the north, as already mentioned;[671] for the wind will either close their eyes or else make them bleared, and they will die of looseness. If you wish to have females,[672] you should let the dams have their faces towards the north while being covered.
CHAP. 77. (34.)—THE LAYING OUT OF LANDS ACCORDING TO THE POINTS OF THE WIND.
We have already stated[673] that the umbilicus should be described in the middle of the line. Let another line be drawn transversely through the middle of it, and it will be found to run from due east to due west; a trench cut through the land in accordance with this line is known by the name of “decumanus.” Two other lines must then be traced obliquely across them in the form of the letter X, in such a way as to run exactly from right and left of the northern point to left and right of the southern one. All these lines must pass through the centre of the umbilicus, and all must be of corresponding length, and at equal distances. This method should always be adopted in laying out land; or if it should be found necessary to employ it frequently, a plan[674] of it may be made in wood, sticks of equal length being fixed upon the surface of a small tambour,[675] but perfectly round. In the method which I am here explaining, it is necessary to point out one precaution that must always be observed by those who are unacquainted with the subject. The point that must be verified first of all is the south, as that is always the same; but the sun, it must be remembered, rises every day at a point in the heavens different to that of his rising on the day before, so that the east must never be taken as the basis for tracing the lines.
Having now ascertained the various points of the heavens, the extremity of the line that is nearest to the north, but lying to the east of it, will indicate the solstitial rising, or, in other words, the rising of the sun on the longest day, as also the point from which the wind Aquilo[676] blows, known to the Greeks by the name of Boreas. You should plant all trees and vines facing this point, but take care never to plough, or sow corn, or plant in seed plots, while this wind is blowing, for it has the effect of drying up and blasting the roots of the trees while being transplanted. Be taught in time—one thing is good for grown trees, another for them while they are but young. Nor have I forgotten the fact, that it is at this point of the heavens that the Greeks place the wind, to which they give the name of Cæcias; Aristotle, a man of most extensive learning, who has assigned to Cæcias this position, explains that it is in consequence of the convexity of the earth, that Aquilo blows in an opposite direction to the wind called Africus.