BtM SCIENCE OF AGRICULTURE. Part it 



,iihI if the soil presented everywhere the same resistance t<> it, it would require no holding, 

 but would maintain its position « ben draw n along by the cattle ; lint as the least inequality 

 of surface or tenacity, or the additional resistance of a root or stone, destroys the equili- 

 brium of the forces acting against the wedge, the presence of the bolder or ploughman 

 becomes necessary to adjust its position. In two-wheeled ploughs, however, this is done 

 in a great measure by the wheels, but not so rapidly as by the instantaneous movement 

 of the holder on the ends of the handles acting as levers. The manual operation of hold- 

 ing the plough in a proper position, and directing the horses or cattle which draw it at 

 the same time, is only to he acquired by experience : when once attained, it is perhaps the 

 most agreeable and healthy of agricultural exercises; the body being kept upright, the 

 arms and legs brought into action, and also the eye and the mind, to keep the furrow 

 straight and of regular width and depth, and the voice to speak to the horses. It is 

 almost needless to mention that the art of drawing a straight furrow with a plough in 

 which the horses are yoked in pairs, consists in keeping each of the horses a small distance 

 apart, so as to see forward between them ; and next to fix the eye on two or more objects 

 beyond the land to be ploughed, and keep these objects and the coulter or muzzle of the 

 plough always in one line. By far the best practical directions for ploughing have been 

 given by the author of the article Agriculture in the Supplement to the Encycloptvdvi Brit. 

 which we shall quote at length. 



*3240. Three different mints require particular attention in ploughing : 1. The breadth of the slice to lie 

 rut ; 'J. its depth ; ami 3. the degree in which it is to be turned over ; — which last circumstance depends 

 both upon the construction of the plough, particularly the mould-board, and the care of the ploughman. 



3241. Tin- breadth and depth of the furrow-slice are regulated by judiciously placing the draught on the 

 nozzle or bridle of the plough ; setting it so as to go more or less deep, and to take more or less land or 

 breadth of slice, according as may be desired. In general the plough is SO regulated that, if left to itself, 

 and merely kept from falling over, it would cut a little broader and a little deeper than is required. The 

 coulter is also placed with some inclination towards the left or land side, and the point of the sock or share 

 has 8 slight tendency downwards. 



3242. The degree to which I he furrow-slice turns over is in a great measure determined by the proportion 

 between its breadth and depth, which for general purposes is usually as three is to two; or when the 

 furrow is nine inches broad, it ought to be six inches in depth. When the slice is cut in this proportion, 

 it will be nearly half turned over, or recline at an angle of forty or forty-live degrees ; and a field so 

 ploughed will have its ridges longitudinally ribbed into angular drills or ridgelets. But if the slice is much 

 broader in proportion to its depth, it will be almost completely overturned, or left nearly flat, with its 

 original surface downwards, and each successive slice will be somewhat overlapped by that which was 

 turned over immediately before it And finally, when the depth materially exceeds the width, each 

 furrow-slice will fall over on its side, leaving all the original surface bare, and only laid somewhat ob 

 liquelv to the horizon. 



I Ploughing with the breadth and depth nearly in the proportion "/three to two is best adapted tor 

 laving up stubble land after harvest, when it is to remain during winter exposed to the mellowing influ- 

 ence of frost, preparatory to fallow or turnips. 



3244. The shallow furrow of considerable width, as five inches in depth by eight or nine wide, is under- 

 stood to answer best for breaking up old leys ; because it covers up the grass turf, and does not bury the 

 manured soil. 



3245. Ploughing with the depth of the furrow considerably exceeding the width is a most unprofitable and 

 uselessly slow operation, which ought seldom or never to be adopted. 



The most generally useful breadth of a furrow-slice is from eight to ten inches, and the depth, 

 which ought to be seldom less' than four inches, cannot often exceed mx or eight inches, except in soils 

 uncommonly thick and fertile. When it is necessary to go deeper, as for carrots and some other deep- 

 rooted plants, a trench-ploughing may be given by means of a second plough following in the same furrow. 



3247. Shallow ploughing ought always to be adopted after turnips are eaten on the ground, that the 

 manure may not be buried too deep ; and also in covering lime, especially if the ground has been pul- 

 verised by fallowing, because it naturally tends to sink in the soil. In ploughing down farm-yard dung, it 

 is commonly necessary to go rather deep, that no part of the manure may be left exposed to the atmosphere. 

 I n the first ploughing for fallows or green crops, it is advisable to work as deep as possible ; and no great 

 danger is to be apprehended, though a small portion of the subsoil be at that time brought to the surface 



3248. Thefurrow-sHces are generally distributed into beds varying in breadth according to circumstances; 

 these are called ridges or lands, and are divided from one another by gutters or open furrows. These last 

 serve as guides to the hand and eye of the sower, to the reapers, and also for the application of manures in 

 a regular manner. In soils of a strong or retentive nature, or which have wet close subsoils, these funou s 

 serve likewise as drains for carrying off the surface water; and being cleared out, after the land is sown and 

 harrowed, have the name of mater farrows. In wet lands, furrows are sometimes drawn or dug across the 

 ridges, for the purpose of cam Lag oil' the surface water from hollows ; these are called cross waler-funoirs. 



384ft 'Ridges are not onlj different in breadth, but are raised more or less in the middle, on differ* nt 

 soils. On clayey retentive' BOils, the great point to be attended to is the discharge of superfluous water. 

 Hut narrow ridges or stitches, of from three to five feet, are not approved of in some of the best cultivated 

 counties. In these a breadth of fifteen or eighteen feet, the land raised by two gatherings of the plough, 

 is most commonly adopted for such soils ; such ridges being thought more convenient for manuring, sow- 

 ing, harrowing, a'nd reaping, than narrower ones ; and the water is drained off quite as effectually. 



Ridge*, on dei/ porous turnip soils, may be tunned much broader ; and, were it not for their use 

 in directing the labourers, mav be, and sometimes are, dispensed with altogether. They are often thirty 

 or thirty-six feet broad, which in Scotland are called hand-win ridges, because reaped by a band of shearers, 

 commonly six, served bv one binder If it be wished to obliterate the intermediate furrows, this may be 

 done by casting lip a narrow ridgelet or single bout-drill between the broad ridges, which is afterwards 

 levelled bv the harrows. 



3251. The made of forming ridges straight and of uniform breadth is as follows : — Let us suppose a field 

 perfectly level, that is intended to be laid offinto ridges of any determinable breadth. The best ploughman 

 belonging to the farm conducts the operation, with the aid of three or more poles shod with iron, in 

 the following manner : The first thing is to mark ofT the head ridges, on which the horses turn in plough- 

 ing, which should in general be of an equal breadth from the bounding lines ofthe field, if these lines are 

 not very crooked or irregular. The next operation, assuming one straight side of the field, or a line that 

 has been made straight, as the propel direction ofthe ridges, is to measure off from it, with one of the 

 poles fall of them of a certain length, or expressing specific measures , half the intended breadth ot the 

 ridge if it is to be gathered, or one breadth and a lull it to be ploughed Hat; and there the ploughman 

 Bets up a pole as a direction for the plough to enter. On a line with this, and at some distance, he plants 

 a second pole and then in the same manner a third, fourth, \c, as the irregularity of the surface may 



